Viessmann W100 boiler - not what I thought it would be.

#viessmann #joule #highgain
New heat only Viessmann boiler installation with Joule High Gain unvented cylinder on hot water priority.
My website: www.urbanplumbers.co.uk/
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[@johnhunter4181]

Not quite the same situation but we had the 100-W System boiler installed as a 4-pipe system to replace my aging Y-plan Thorn Apollo. IT'S BRILLIANT - we got rid of the Cylinder Stat, Room Stat, 3-port diverter, Grundfos Pump, Header Tank, Room Stat, Honeywell Programmer and wiring centre - ALL GONE! All of that was replaced by the boiler and a couple of 50p NTC Sensors - one on the cylinder and one outside for weather comp. The boiler cost £657.40 +VAT for the 11kW version - but note this outputs 17.5kW on the DHW feed. It comes with wifi so all the timing and control is done from my phone with an app. The pump, diverter and expansion vessel are all in the boiler which makes installation incredibly simple. Not sure why you changed the cylinder? - we are still using the existing vented one.

[@shanechis]

Another great video. I appreciate that you take the time to explain the job in hand in a nice and simple approach for non-plumbers like myself. Thanks.

[@UrbanPlumbers]

Great! I always think it is too complained for non plumbers!

[@johnburns4017]

@@UrbanPlumbers It is complicated for plumbers, not for heating men. There is a difference.

[@Brian77766]

Really enjoy your content! It is of high quality, well explained and honest. Camera work is fantastic. I think you're producing some of the best boiler/plumbing content on KZbin. I would love to have an intergas boiler as per your recommendation. Keep up the great work!

[@UrbanPlumbers]

thank you!

[@mylifeintheuk2093]

@@UrbanPlumbers Is the Baxi800 25W better than this one ?

[@DJJAMONE]

I feel like a fraud of a plumber gas engineer when i watch your videos so much knowledge only 26 but way off but everyday is a day to learn great video keep them coming

[@UrbanPlumbers]

I knew nothing and could not even solder properly at 26!

[@TheJask101]

@@UrbanPlumbersserious? So did enter this trade after 26? Incredible content thank you so much for the time and effort you put in your videos. The theory videos are a god send. Thanks again

[@GeorgeCox]

Another quality video, Szymon. Thank you very much! Your delivery is spot-on. :-)

[@85Johanf]

Great video! Very much enjoy your content. Take in account that wifi has its limitations. With a lot of devices using its band nowadays and channels being used by neighbours (not in this case of large property, but certainly in apartments). Wifi also leaves a dependance on the router. Wired is often more reliable, if applicable.

[@jaistanley]

I have the combi. Had it installed about 6 months ago... and it's absolutely fantastic! Weird.

[@UrbanPlumbers]

Viessmann combi version of this boiler is excellent !

[@davidataylor]

Thanks for the video - you put some faith back into plumbing. Regarding the 100W, I can only report as an end user and am pretty disappointed in the noise it makes. It replaced a Glowworm 35W installed in 1993! Given the age of the old one, I was expecting a nice low noise boiler and certainly their website and general Googling led me with this impression. It sounds like a jet engine. Luckily it's in the hallway and I'll have a look at putting insolation in the door but I feel sorry for those that have to have this thing in the kitchen.

[@UrbanPlumbers]

Yes, lack of sound proofing on a supposedly premium boiler is taking the pi$$ on V part. Seems like a decent boiler though, time will tell.

[@LabRat6619]

I found the on DHW side it caused my cylinder coil to vibrate. I cured this by fitting a bypass on it. Otherwise a quiet boiler.

[@AR-dn6kh]

Got a viesmann 50 combi fitted last month, in a kitchen cupboard,very quiet and good hot water rate. So far no complaints.

[@UrbanPlumbers]

They do look good value but plates block on them in no time

[@triffid68]

@@UrbanPlumbers the chap that fixed my old combi (23 years old) before I got a Vaillant Ecoplus told me stories of when Viessmans go wrong they are not easy to fix/get spares for. He has been in the industry for about 25 years. I decided on a Vaillant EcoTecplus on his recommendation.

[@lewisneal7367]

The shower pumps look great. I fitted my first Viessmann vitodens 050 recently. Enjoyed fitting the boiler but had a nightmare pairing the Viessman Vicare programmer but once it was connected its great. No wiring involved. Also had same issue with the shower being on a pump and didn't realise aqualisa do a smart pump for the existing showers 👍

[@UrbanPlumbers]

Yes, but the shower module is quite expensive at £350 per unit.

[@cuckingfunt9353]

@@UrbanPlumbers So you paid more for the heat only ? .... Common situation, I always buy the combi equivalent even if it's for heat only, if it's a no volt control issue you just stick a 240v relay in. There's no way I'd pay for money for less boiler.

[@SalimKhan-gk1fh]

Viessmann are a great boiler brand that is my experience last 12 years . they are easy to work on everything is easily accessible the technical department is very helpful on the few occasions I’ve had to ring them . of the ones I fittedAll customers noted the quietness and economy on gas consumption. I have about four of the boilers in my family

[@UrbanPlumbers]

they are definitely very efficent boilers and have some very clever tech in them. However this one is defintiely not quiet! I hear very mixed opinions about back up and warranty call outs. Also spares not being available and very expensive. My experince so far is a mixed bag. I will install another one soon. I need more time to decide if I like those boilers or not.

[@SalimKhan-gk1fh]

@@UrbanPlumbers Good to hear back from you my friend I really enjoy your videos I have not had any problems with spares availabilities although some parts can be ridiculously expensive for no reason at all , however most smaller parts like pipes PRV’s flow switches etc are only about £5 more than other brands if you ever use the vitodens 111 model storage Combi you will be hooked this is a phenomenal boiler I fitted two so far in restaurant applications easily able to cope with three commercial sinks and all the heating load! I have only called warranty once or twice and they came the next day The engineer told me “we are struggling with the likes of British Gas throwing the boilers is in poorly fitted them and creating headaches for us”

[@edc1569]

My only complaint with my Viessmann 50 Combi is the time it takes to deliver hot water, saving me a fortune with weather comp compared to my old (non-condensing combi). Mine seems very quiet, and its in my kitchen which is open plan so thats important.

[@tonym3933]

We have a Viessmann Vitodens 100-W (WB1B) which is 3 years old. Last time it was serviced, the engineer told us the heat exchange is 'kettling' and he wouldn't be surprised if it needed replacing within a year! Not great news at all.

[@k20aa]

Another great job . Can I borrow peter he lifted the cylinders like they where nothing 👌😉👍

[@UrbanPlumbers]

Ask Peter!

[@tonywebb9909]

Am happy with my w100 19kw I fitted. I upgraded to a four pipe system but the boiler did not come with the HW priority fittings (just caps) and they wanted an extra €46 for them!! It did have all the wifi and HW priority relay was free (don't need the relay if you run a sensor cable to the cylinder). I did add a gate valve to the HW return to slow it down a bit and regulate the water temperature.

[@UrbanPlumbers]

System boiler though, not heat only?

[@tonywebb9909]

@@UrbanPlumbers yes, correct system boiler. It seems to be very good, it even emailed me to say the system pressure was low.

[@HVACRTECH-83]

From my experience all viessmann boilers are fantastic, oil,gas models both great ive installed and maintained hundreds over the years, if the customer has the money and wants to go all out on the best, this is what i give them. Water quality is very important on these types of boilers,keep that in mind. If you have bad water you need to remedy that first before filling the system, then you will have no water issues. Trust me on this, some brands are now not honoring warranties do to water related failures

[@buzzardc7]

Your knowledge. Wow. Great video.

[@UrbanPlumbers]

Thanks for watching!

[@billholmes3462]

I have recently had a Viessman boiler fitted mainly because my plumber pushed it. The previous boiler was a Worcester Bosch which although old was practically silent unlike the Viessman that is like a freight train in comparison, so much for progress. I would not get another just based on noise levels alone.

[@KinoapparaTom]

Hey, which model exactly? Thanks!

[@hatchett122]

Surprising, I have the newer w100 system boiler and it is really quiet.

[@timyoung4793]

I’m hoping that is the 050 and not the new 100 b1he system boiler that I just ordered. Thank you for the great video and the education

[@UrbanPlumbers]

I am afraid it is a new 100W

[@johncampbell6715]

Horizontal cylinder should cope better with stratification. I think if you hang in there with Viessmann you will slowly come around. Your videos and work ethic are a credit to the industry.

[@UrbanPlumbers]

Viessmann is a great product, just unclear instructions and heat and miss support

[@griffithsheating]

Ive fitted vaillant for years. I've got a glut of big whole house underfloor jobs in some large properties to do in the coming months and ive specd' Viessmann system boilers and a couple of 222s because of the super low modulation paired with the weather comp and ability to plug and play mixed zones etc. I think viessmann are several steps ahead of almost everyone right now.

[@UrbanPlumbers]

I hear systems and 200 are much better than heat only and 100. Pricey on supply and spares though.

[@griffithsheating]

@@UrbanPlumbers last one I did was boiler, vert flue and weather sensor £1400 plus vat for a 32kw 200 system. I thought that was pretty good.

[@UrbanPlumbers]

I think I paid similar for w100 with flue!!!

[@GavinLawrence747]

@@UrbanPlumbers I was quoted £2450 for a 050-w - that included install and a manga clean. I'm honestly not sure if that is expensive or not.

[@millomweb]

@@GavinLawrence747 I think our 100W heat only was £1200-1300 inc install !

[@russellbaldry5095]

Another great job. I found on a couple of jobs that had digital showers that if you open the unit there is a switch inside to select combi mode! Not sure if this is on all models.

[@sbarsanescu]

Great content, excellent delivery! My 2 cents re Viessmann: the primary HX is imo the best in the industry. Moreso, it was designed many years ago and was just spectacular compared to parrallel flow condensing HX of the time. That said, of late Viessmann made some design decisions that are peculiar - such as the rubber "car radiator" hoses to/from HX. Also, the composite water block. Granted, not many cracks due to embrittlement but... ANother gripe - poor water ingress protection for the electronics. On Opentherm - true, it's missing, but same for Buderus. Vaillant also has its own controller offering. The idea is to lock the customer in the ecosystem, not give them options. Opentherm is well, pure anathema. It's open for Chrissake! /rant begins On another note, I think overcomplexity is rampant in the industry today. E.g. Complete Combustion Control! Does a boiler need a Lambda probe? Definitely not! What about combustion "over" optimization through flame ionization analysis? Nope, not that either. It's about cost vs benefit - a good system does fine on 1:5 modulation, 1:8 or 1:10 is a lot. Adding stepper gas valves and touchy electronics (we're talking microamps here in a dirty, moist environment) is just not worth the benefit imo. Bear in mind that few systems modulate power delivery. Is Internet driven but on-off the rage? If the boiler is capable of deep modulation but used poorly (on-off) where is the gain? ant over. Thank you for your great content!

[@iqfighter100]

The heat only boiler looks like a Vitodens 050W to me, the combi is definetly a Vitodens 100W, correct me if I'm wrong. The 050W is cheaper and lacks some of the features of the 100W series. I'm looking forward to the 050W, because they are not available in my country yet. They are somewhat overpriced boilers, I agree on that, spare parts are pricey too but relatively easy to service and you get a decent technical support from the manufacturer. Great video, excellent job keep up the good work!

[@UrbanPlumbers]

this is w-100 heat only.

[@russellbaldry5095]

I installed a W100 system and also found it very confusing to install. So many different boxes and instruction book was like a telephone directory! On the plus side it came with the separate hot water circuit built in but again was quite involved to set it up. I also could not understand some little red clips that came with the front cover. No matter how i tried to fit them the instructions were un helpful and they kept falling off. I left them off in the end and the cover fitted fine without them.

[@CoolMusicToMyEars]

Well there is a manual operating and service manual supplied with mine, including pipes information, plus Viessman do have a full website with all the information its great, 200W is good

[@roody262]

Nice work! Get some grey/silver cable ties for the pipe insulation 😎

[@UrbanPlumbers]

I need to track down insulation adhesive

[@anthonyfiorillo3177]

nice Video, i am a heating tech in the north east US and i have worked on and installed basically every brand boiler out there and what i find strange in your video is that the heat only viessmann is different from the combi idk if thats how it is made for the UK but not in the states. the combi and heat only model in the states is the same exact unit minus the hot water heat exchanger, but you can use those same tappings to run a hot water tank with the internal pump on priority no problem. they are a great boiler probably the best out there for easy service access and just durability. During the release of the new 100 i installed 2 combi models both 199000 btu and piped the DHW together and it works flawlessly. just strange that the heat only boiler is so different.

[@millomweb]

Difference I knew about re my heat only is that it has 2 temp sensors - has a return flow sensor. I wish it hadn't - I've considered bypassing it !

[@BuddyBoy68]

Thanks for your very helpful video. I was going to order a Viessmann boiler, but I'm now considering switching to a Navien boiler. Have you any experience with those yet? Æ 🤔

[@garyhawkins9246]

That Worcester CDi would appear to have never been maintained or poorly maintained as the probe set has a sight glass, they were phased out years ago and should have been replaced suggesting that if it has been “serviced” then it’s just been damp cloth and analyser, proper maintenance may have addressed the condensate leak before it became a problem and extended the life of the boiler. Personally I clean and wash the heat exchanger on a CDi every year as it’s only 2 x 10mm bolts to access, then clean out the trap and replace any failed seals, you can get the whole thing done including primary filter and all tests in 1.5 hours if there are no issues

[@Martindyna]

Great to hear that you clean the heat exchanger every time on a Worcester, so many seem to just clean the trap & tune the burner for a `service'. I understand that the round type `heat cell' should have it's baffles removed & cleaned every 5 years regardless of the pressure drop across it on full fire. Unfortunately I wasn't aware of that on my boiler.

[@Csharpu]

Thanks for making this video. I've got the exact same boiler and DHW box and couldn't figure out why flow was running at 85C. Very dissapointing. Adjusting DHW flow should not be a nice-to-have feature but is a necessity. Did you ever hear back from them?

[@marvincon1417]

Your work is top quality 👍

[@UrbanPlumbers]

Thanks 👍

[@jayseabie215]

Really like your work, very neat and tidy. Shame not all plumbers are like you! I've just had a 100 Vitodens (combi) installed in my house. It heats the water REALLY hot even when I've set the water temp to 50C so not all that sure that it's actually doing what I want! It's also on climate control (I wanted weather comp. but also wanted the App to set the control and was told that you either must have one or the other as the stat that enables the wireless control is also a climate sensor and you therefore can't have the weather sensor wired up - not sure if I was being mislead there?!) BTW all of the 050 Vitodens have no insulation on the inside of the case, not just the heat only versions.

[@chester6343]

They're discontinuing the 050 I believe

[@jezuslookslikeme]

Thanks for the amazing explanation. I have 1 question. Is it possible to use a Viessmann combi device ONLY for warm water and close off the heating side of the combi? Planning to place a woodstove (removing all the radiators) and use that for heating but we still want to take a hot shower😮. Or does that harm the Viessmann vitodens 200?

[@Chuckle__s.]

Why didn’t you fit a system boiler on a four pipe set up? Especially as you sealed the system anyway. The heat only model is designed for fitting inside kitchen units, which is pretty exclusive to the UK, hence the lack of features as the market for this model is so much smaller then the rest of Europe etc.

[@leontingroza8591]

Great video

[@reliabill87]

Can you do a video in pipework of system boiler and also do the same with the wiring plan.

[@CrashUK28]

I have Viessmann W100 2021 - 35kWh boiler the wifi app is great it tell you how much gas is using and any errors get flag up on the app, Its can lower its output to 8%

[@UrbanPlumbers]

Yes that app looks nice

[@johndevlin980]

Great content once again! 👍

[@framclean7910]

great video

[@UrbanPlumbers]

Thanks !

[@peterfranks7626]

hi, just a question ! myViessmann W100 combi boiler, was fitted 7year ago, i tried to turn my flow temp down like you show on your vid , but it started to run (overrideing my digital room stat. and the pressure when up to 4bar and when i turned it back up to full the presser went down and the system went off . just wondered if you have any suggestion on why and how if pos i can get my flow temp down without the above happening. ps love the vids . you know your stuff. regards, peter

[@jessielees]

do you think the built in pumps in these boilers, the W150 , are enough to pump water from the basement up through a 2 story house? 1800 sq ft, 10 rads. (5 on main floor, 5 on 2nd floor). might add a few rads to the basement in the future and a hot water storage tank... just curious your opinion... whole house heating is a single zone so Im questioning whether or not I really need a llh and external pump...

[@user-te1le7ck6b]

Wow given the house I can only imagine your bill I’m guessing 20k+ you truly earn it so I hope you got even more hahaha ps love petr seems like such a gentle giant

[@UrbanPlumbers]

I wish I could charge that kind of money 💰 😂

[@rocketsciencemusic5398]

We currently have a 20 ish year old vaillant combi boiler, which is situated in a cupboard in the bathroom. We want to get this moved into the loft so we can make room to add an upstairs toilet (old 50s house which doesn’t have one). We also have solar PV and so we want to change from a combi to an unvented system boiler, because we want to use a solar diverter to use any excess energy from the solar to go into the immersion instead of being exported to the grid, which pays practically nothing now the FIT scheme has ended, so the savings are from using the energy rather than exporting. I think we could go a solid 8 or 9 months of the year gas free, and only use the solar PV to do everything. What do you think? 3 bed semi, 1 bathroom.

[@UrbanPlumbers]

I installed a solar diverter on my last heat pump job and it seems to be working fine (it’s called Eddie) If you get a gas boiler make sure you get a how water priority set up and a high gain cylinder so it’s compatible with a heat pump in the future.

[@elwittinio2865]

Not fitting any more viessmann boilers. Had to wait 2 weeks for a W50 PCB, not good enough. Just fitted another ideal max C30 today with halo, love them and the baxi 600 - 800. Top video again mate 🤘👏

[@UrbanPlumbers]

I would not fit Ideal again. There is literally nothing you can adjust on them - no range rating, no pump setting, very poor modulation. They almost always are overpumped and running at super narrow DT which makes having a condesing boiler a bit pointless. I would rather choose Worcester 4000 and 8000.

[@elwittinio2865]

@@UrbanPlumbers I know what you mean about adjustment / gas valve. Baxi is my favorite, Worcester boilers deffo no, especially the compact, but the classic is a good one. I like to keep my hands cut free 😂

[@6malley]

Can you please upload a video of viessmann storage combi, if by any chance if you have installed one, since it doesn't have a WiFi built-in, we are thinking to move to weather therma from open advised by viessmann trained engineer/plumber, as we are still getting a lot of gas bill.

[@Cmwgas]

brilliant video, not sold on the new Viessmann either. just be aware that you need a 2 port on the flow to the cylinder as an overheat cut off

[@UrbanPlumbers]

You don’t need a 2 port on the flow to the cylinder if you use a 3 port with normally closed port pointed towards the cylinder

[@RayMondElec]

Excellent video. Would it not been better to fit two boilers one for central heating and one for hot water. ? Reason I say this is when the cylinder takes priorty for heat. The house will start to cool down. Why would you want that? Or am I missing something here. Also did you run a hot water loop with small pump to minimize the use of waiting for hot water to come through on long runs? Thanks

[@UrbanPlumbers]

It will only take 20 minutes to fully reheat the cylinder. This allows for much higher overall efficiency as heating can be done with modulated output with weather compensation. You can’t reheat water with weather compensation as flow temperature would be too low.

[@normanboyes4983]

Thank you for posting and interesting installation. I watch a few boiler installation videos. I have noticed that skanky cabinet sealing strip on a few V100s’ most recently on Allen Harts install video. I realise it was a large house but was it really impractical to achieve a one boiler installation?

[@UrbanPlumbers]

One boiler install would be very difficult. Property is well over 500m2 and absolutely massive. 2 separate heating system, 2 gas meters and 2 separate mains water connections. It would actually be more expensive to run it from one boiler and reconnect water and central heating and give poorer performance and create very long dead legs on hot water. One system Ans one boiler was simply not practical.

[@normanboyes4983]

@@UrbanPlumbers Thanks for your response. Understood.👍

[@millomweb]

@@normanboyes4983 My local theatre swapped from oil-fired to gas. They fitted an 80kW boiler heating a 'short circuit' then piped into that circuit with flow/return to rads. I'd guess that an 80kW was more expensive than two 40kW or even 3 24kW due to the fact so many fewer would be sold. The layout of the theatre would probably suggest 2 systems - one backstage and one front of house.

[@mufuliramark]

I live in what could be described as a 'New build' although its 16 years old. The combi boiler has never coped with our three showers and even when two are on at the same time, its insufficient. What in your opinion would be the best combi, which is going to be getting replaced after august,, to provide sufficient heat and pressure.

[@UrbanPlumbers]

Combi for 3 bathrooms? None. Get unvented if you can and a system boiler. Check my previous video to get the idea about the set up I would recommend.

[@razvanlex]

You need a 35 kW boiler to manage 2 showers at the same time, depending of the piping, flow and pressure. But you should install ECO head showers, no more than 9 l/min and preferably a thermostatic shower battery. A 35 Kw gas boiler at Delta T 25 has a flow of 21 l/min, at Dt 30 17,5 l/min and at Dt 35 15 l/min. A 25 kW gas boiler respectively 15 l/min, 12,5 l/min and 11 l/min.

[@paguliukas]

Thousands of years later you still look young 🤣😁

[@funzo1983]

Great video. Only installed Veissmann combis and to me they seem like brilliant boilers but the instructions and some of the features don’t make sense. Also, the jigs cost you more but literally just make life more difficult. Weird.

[@UrbanPlumbers]

Yes Viessmann is definitely a weird one. Good boiler but very strange manual and support. It feels Viessmann uk don’t understand their own product

[@SimonBosley]

I had the Vitodens 100-W Combi Boiler fitted a couple years ago (heating and water). Each year during winter it has stopped functioning with the F4 error code. Last time the condensate trap needed cleaning, waiting to see what the problem is this time. The heating engineer was unable to explain why it needed cleaning so early from new. From the information I can find online, the condensate trap is located right at the back of the boiler, and not an easy fix for someone with zero skills (A.K.A... me!). Booked another local engineer to come out, costing me a small fortune now!

[@milkyporridge5929]

Why not have your boiler serviced?

[@SimonBosley]

@@milkyporridge5929 both times it broke down before even the service was due, then the repairer gave it the once over when fixing. Thankfully I don't need it until winter again (my shower is electric). I'll probably get it fully serviced in September this year. It turned out the problem this time was just the electrical lead for the pilot light sensor, so he didn't charge me thankfully!

[@motyla_noga4802]

I have the Vitodens 050 where diverter valve failed after less than 3 year just out of warranty. Really regret going for Viessmann :(

[@UrbanPlumbers]

Could happen to any boiler. Could also be system water problem. Besides, 050 has 7 years warranty ?

[@subhadraislania368]

I wish I’d seen your video before choosing a 100w 19kW heat only boiler. I noticed it was very loud when turned on. Customer service was a nightmare to deal with. Eventually they sent an engineer out and the fan had to be replaced- I would not expect this from a brand new boiler. Does anyone know the optimum efficiency settings?

[@UrbanPlumbers]

your installer should have set it up? no?

[@paulross8821]

Nice video and tidy job. Have you installed any Navien boilers. Nice pieces of kit and not crazy prices. Not full of plastic parts like Worcesters either. Decent flue run lenths also.

[@UrbanPlumbers]

have not seen Navien. I am happy with Intergas, also Viessmann boilers seem actually pretty decent. Time will tell.

[@paulross8821]

@@UrbanPlumbers They seem to be mostly sold in plumbase. Stuck one in 5 years ago for my sister and never been back apart from service. Mines been in 3 years and never skipped a beat.

[@mgbroadsterJ]

Could you do a video on creating the curve for the weather comp ? . I struggle to understand how to create curve .

[@UrbanPlumbers]

yes, can do

[@heslind]

Mine constantly has an orange leaf that on and off. Why?

[@dinendale666]

Nice but surely you should put a filling loop where the customer can access without climbing up ladders into a loft space ?

[@UrbanPlumbers]

That would have been ideal but was difficult due to granite worktops in place. It was discussed with the client as an option, and client decided against having it by the boiler. (Cost, complications of running additional pipes, etc)

[@johnfigueiredo3223]

Well I based my purchase on lots of positive reviews about Wiesman 100W including plumbing merchants

[@ScottyDog345]

Wider cylinder to prevent stratification?

[@ollieneate7928]

Awesome video! Just a question are you allowed a 3 port valve on a unvented cylinder I thought you wasn't allowed? Awesome video very well explained !

[@UrbanPlumbers]

You are. Just make sure that spring return closes the port to the cylinder not heating

[@ollieneate7928]

Ahh okay I thought you wasn't allowed them incase they stuck in place and could pass

[@UrbanPlumbers]

Viessmann allows you to install invented without a zone valve at all !

[@effervescence5664]

Used to fit so many Viessmann boilers 10-20 years ago, mainly commercial but the domestic weather comp controls and original boilers were great, expensive and over engineered for a domestic market. The newer ones, expensive not as good quality, missing bits but still pricey, just overall not impressed with them for the domestic market anymore. Oh and the biggest issue - fault codes they can't find in the English or German books and actually getting spares as Telford seem to have none when you want them and Viessmann spares in southern counties depending what it is is waiting for it to come from Germany. I'd rather fit a Vailant/ Worschester or Intergas.

[@UrbanPlumbers]

Exactly my feeling. Seems like great boilers but spares, manuals, etc will be definitely a problem

[@ogjimbob]

@@UrbanPlumbers I have fitted and maintained the 100 series since they came out, never found them to a problem, spares (when needed , rarely) have never been a problem, I have had a few with clogged heat exchangers, which have been easy to clear, and are due to lack of correct flushing and adequate filters. cost? yup not the cheapest, but in line with the Vaillants and Worcesters of this world. the weather comp is so simple that I can fit it in the background and the customer never really needs to do anything with it, there are defintely better more adaptable systems, but in my experience most UK owners arent interested in playing with anything more complicated than a rotary room stat :P so a system that works in the background is ideal. PS as to spares availability, I have 3 suppliers in my town who hold spares or can get them next day, failing that Viessmann Direct have always been reliable and quick

[@paulgannon3261]

Could not agree with you more.

[@SalimKhan-gk1fh]

@@ogjimbob well said Ken I have been fitting the 100 series for 15 years now and I really like them and more importantly so do the customers especially the gas efficiency as little as 24p an hour for three bedroom house also , probably the only boiler I can add an MC3 cleaner into and properly flush out due to the bleeding point at the top of the heat exchanger and the lower flow and return connectionWhich are fantastic for Aqua Vaq fluid extraction vacuum cleaning.

[@araskirisoglu5494]

This is vaillant and other manufactured boiler campany used the semanta heat exchanger but viessmann used exhanger by productued viessmann. Viessmann is high quality.

[@SCOTE991]

I looked at Viessman compared to Intergas this morning on specifications. I immediately noticed that Viessman boilers can at lowest fire to 3.2kw seemingly across the Vitodens range - the 32kw boiler can modulate down to 3.2 but so can the 11kw model, how is this possible? Intergas boilers the minimum rate is about one third of the maximum of the boiler eg the Intergas HRE 30 SB can fire between 8.20 - 26.60kw and the 18 can fire between 6.10 - 18.20KW. That would seem to be not ideal when using weather compensation and opentherm when the thermostat is setting a low flow temperature. When the house requires only a moderate amount of heat the boiler will be cycling on and off a lot - Is this true or am I missing something? I am looking around for a replacement for my over sized Promax System HE plus 32kw boiler that is cycling a lot since it only goes down to 12KW.

[@millomweb]

My Veissmann is 19kW down to 9kW !

[@andrewmillwardwatford9410]

The 200 goes to 1.8kw.

[@jerneje]

What's your opinion on Beretta boilers ? thanks

[@patrickwheeler2646]

You can't use Opentherm with external motorised valves very easily, Nest won't do it for instance.

[@UrbanPlumbers]

Yes very little choice for multizone with OT

[@tomhilditch3882]

Eph CP4 is a good setup, like a cheap EVO, kinda.

[@valentinmirauta7059]

Hi great video again I am newbie in the gas industry, very clever the way with hot water priority and I’ve seen the other video you’ve done with the 2 port valve normally closed What are your tips on getting more knowledge on how to set up hot water priority in any case and i may ask is the 3 way valve as the old W plan as well can be done a X plan i assume for hot water priority? Thanks

[@UrbanPlumbers]

Yes D plan is similar to W plan. I use x plan if there is just 1 heating zone and D plan if there are more heating zones. Same set up really. I am working on a video that explains all hot water priority plans. Trouble is every boiler manu does it slightly differently

[@valentinmirauta7059]

@@UrbanPlumbers So on D and W is use of a 3 way valve and for 1 heating X plan is just 1 normally closed 2 port valve? Is any books you recommend for diagrams? Thanks

[@UrbanPlumbers]

I will post all diagrams in upcoming video. It will take 3-4 weeks thoguh before its ready

[@valentinmirauta7059]

@@UrbanPlumbers That’s great thanks

[@TheZippyMark]

@Urban Plumbers hi, did this video ever happen?

[@singlendhot8628]

The 100-W is their mass market product. It looks like you have yet to experience their flagship 200-w which is built much better (but really meant for experienced Viessmann installers only).

[@UrbanPlumbers]

I have installed W200 system and doing another one next week.

[@singlendhot8628]

@@UrbanPlumbers Great to hear - it is a very efficient model. Will you be filming a video about it? How does it compare to your heat pump installations?

[@UrbanPlumbers]

@@singlendhot8628 I hate every second of installing Viessmann so far. I'd would rather stay with Intergas.

[@singlendhot8628]

@@UrbanPlumbers I own and operate a small building company- my engineers swear by it and my customers love them too but we have been installing them for years Sorry to hear you have the opposite experience. Keep up the good work on the videos! My guys love watching them and learn from your work!

[@UrbanPlumbers]

@@singlendhot8628 I find Viessmann a real pain in the back. Technical support gives wrong infomration, training you do with them does not get you ready to install them, part numbers are all over the place, templates give wrong fixing postions, as they have changed flue in the mean time, valve kits are missing valves for 4 pipe set up and you waste time trying to understand if you have the correct kit. The only real help you get is from other Viessmann installers. Fitting combis is easy, but when you get to more advanced W200 appliactions, there really is very little help out there and Viessmann manuals make not much sesne and technical is usually is of not much help either. I have been installating Intergas and Vaillant hot water priority systems for years and not even once had to call for help. On Viessmann I need help all the time. I just cann not bond with that company and will no longet installer thier boilers. I am much happier with Intergas.

[@johnmit]

That seems a lot of debris at 0:59 for system that looks to have a TF1 Omega filter fitted above the boiler? Is that all non-metallic, or is the Omega just not that good at catching debris?

[@UrbanPlumbers]

filter was fitted after the flush

[@johnmit]

@@UrbanPlumbers That's a relief - I fitted an Omega to my in-laws system a couple of months ago (having chosen an all-metal filter), so I was worried I'd just fitted a dud XD

[@heslind]

Mine is locked out with a f.142 code. Boiler is 6 months old.

[@TheLegend-nx3mm]

Hey Simon, as always excellent video and great to see. I have been advised the viessmann is the most efficient boiler on the market ? It is one of the first options I was going to suggest to you if you are able to fit at my bungalow in Lincolnshire around May . I will send some pictures of the existing set up next week for you to look at . Kind regards Danny uk

[@UrbanPlumbers]

Definitely a very efficiency boiler, especially system and combi versions, as they can control the pump. I need to get more experience with them.

[@millomweb]

I went for a Viessmann mainly for the stainless steel heat exchanger. I think copper's ok too but forget about anything else as they'll corrode ! It's not Ideal - but it replaced an Ideal that was a bit vicious ! My 100 W heat only can take 10 mins to recover from a dose of cold water !

[@millomweb]

@@UrbanPlumbers You ought to be sniffing around all makes and models - finding out which are the current good ones. Sadly manufacturers are not consistent. What's good this may be crap next.

[@TheLegend-nx3mm]

@@millomweb totally agree good choice mate 👍

[@SalimKhan-gk1fh]

Viessmann is an excellent choice, I’v been fitting Them for 15 years now I like them they are good to work with easy to work on and repair everything is accessible easily customers love them because of the big drop in gas consumption! Easily the best on the market

[@nauxsi]

Recently installed vitoden 100 combi at my brothers home because Valiant seemed pricey and not as reliable as pre-condense models. Had to get used to temps in farenheight. Looking back, was tempted to go 111W as they had downstairs shower. But the size of that put me off. Hopefully will last. When my turbomax packs in I will look baxi or intergas. On the latter early indicators are they don't have much of a customer service dept yet.

[@6malley]

Yes its a monster

[@singlendhot8628]

Out of curiosity, do you have any future installations of this boiler planned? Also, did you consider heat pumps for this house?

[@UrbanPlumbers]

My next one is Viessmann 200, it’s expensive but supposed to be amazing I do not think HP would be even a remote possibility for this house. Too much heat loss, too much work upgrading existing system needed.

[@singlendhot8628]

@@UrbanPlumbers Sorry, I meant a 100-w heat only. I ask because our technicians swear that it cannot be beaten on efficiency, parts and simplicity so was surprised to view that you weren't impressed.

[@metaljay]

@@UrbanPlumbers I’ve got the 200w (system) installed with Honeywell evohome, love it so far but no idea if I’ve got the config setup correctly as viessmann struggle to talk to external gear

[@mikenowacki9729]

Do all Viessmans have WC feature? I have a Viessman combi from 2018

[@UrbanPlumbers]

Yes, every single one.

[@mustafamuflehi4980]

My Viessmann 100-W combi is 3 months old and the burner is intermittently cutting out with no errors. The thermal water tank connected to a solar panel is connected to it. I don't understand why the central heating burner keeps going off, but DHW works fine.

[@UrbanPlumbers]

That’s Viessmann Germany sabotaging UK products after brexit 🤣

[@mustafamuflehi4980]

@@UrbanPlumbers @Urban Plumbers Viessmann refused to look into it because they said their boilers are not designed to be connected to a thermal storage tank and advised to have the pipe connection from the tank to the boiler removed. They say the warm inlet coming into the combi boiler from the tank can confuse the sensors and, as a result, causing the boiler to short cycle. "A solar buffer cylinder has been installed to boost domestic cold temperatures before the boiler acting as a pre- heat. Advised customer that the boiler was never designed to run in this schematical scenario and cannot guarentee that the boiler would not go to a fault. Fault not covered under warranty due to installation, customer will need to contact his installer to fit a normal cold feed in order for the warranty to be re-instated as per MI." So am I right in thinking that not all combi boilers are compatible with thermal tanks? Can you recommend another boiler similar to Viessmann 100-W 30 KW?. Would you say Worcester Bosh is a better option?

[@UrbanPlumbers]

@@mustafamuflehi4980 I honestly do not know

[@TomPalacki]

Can you explain pdhw wiring in details

[@UrbanPlumbers]

I do in my other videos, check them out

[@jayzeebeezee7442]

Crikey! I would love to know what their gas bill is.

[@UrbanPlumbers]

haha - must be much lower with 2 Viewssmann boilers and unvented than it was with a Ferolli and Worcester and 2 vented cylinders. I would guess estimate around £5,000 a year?

[@grahamtheplumber]

My experience with the older models has been crunchy flexible tubes caked with deposits inside them. i have had to remove blockages from the front connection going into the heat exchanger near the flow switch. they look nice but have bad problems with heat exchanger blockages unless the water is spotless in the system. would only put one on a complete new system, not a boiler change.

[@UrbanPlumbers]

I am aware of heat exchanger blockages. I flushed both systems thoroughly and set both pumps correctly, so no over pumping happens - as in my experenice overpumping adds to the porblem of blocakges. New boiler don't have hoses anymore, so they may be a bit better in that respect.

[@drewburrows475]

Completely agree with that. Have had problems with restricted heat exchanger on Viesmann's many times

[@timhancock6626]

Most Viessmans I installed needed a PCB within seven years. None of the Ideals I installed have ever needed a PCB and the weather comp kit on an Ideal is a sensible price for what is essentially a plug and play thermistor and a relay kit. Curiously I'm told you can't Open Therm a Logic Heat Only, but you can for the combis and system boilers. Is this true, and why so ? Is it an external controls issue or pump modulation issue or something. I dunno so I'm asking. The weather comp modulates is just fine.

[@UrbanPlumbers]

You can open therm and weather compensation logics! You need to do x or d plan though which is not explained in the manual. I bet ideal themselves don’t know how to don it. Ideals are terrible boilers though :)

[@timhancock6626]

@@UrbanPlumbers Ideal are fine in my experience. I've had no complaints whatsoever and they are so user friendly. The early logics had a problem or two but they sorted out the sumps. They have sold about 4 million of them when all is said and done. Figures only Worcester can beat.

[@johnburns4017]

@@UrbanPlumbers Ideal are not terrible. They have the Keston brand which is an Ideal Logic using the twin-flue 50mm plastic waste pipe. The extended flue model. If you need this setup this is about the only boiler you can use. I think Navien do one now - not sure on that. The Viessmann offering is using their own plastic piping which is _push fit_ to extend, not solvent weld, which I dismissed out of hand. The Keston is not bad at all. It comes with WC and and an outside sensor and OpenTherm. It does not modulate down that low which is unfortunate.

[@ogjimbob]

Ideal boilers have been an industry joke for the last 20 years or so for their PCB failures ! (Isar.Icos anyone ? ) the latest boilers may have become better, but to put it in context in 15 years I have fitted exactly 4 PCBs to Viessmann boilers, 2 to 200 series that were 15+ years old and 1 to a 100 that another company diagnosed (turned out to be the flue terminal had dropped out on a chimney liner :P ) so one out of upwards of 200 boilers in 15 or so years of the 100 series isnt too shabby IMHO PS on the combis the weather comp is a outside thermistor so no different to the Ideal ?

[@johnburns4017]

The Ideal Logic is not exactly cheap. For what it is, it is expensive.

[@fryske.tynster]

can i ask wat do you think about the daikin/intergas heatpump/b combi?

[@reecehughes8430]

Whats making you try viessmann over intergas from you’re main boiler?

[@UrbanPlumbers]

Customers and curiosity

[@reecehughes8430]

@@UrbanPlumbers thanks for the reply - I was at installer show last week looking at swapping to either viessmann or intergas due to the low modulation both boiler have but watching you’re intergas videos pretty much sold me to intergas but I prefer stainless over aluminium which still puts me on the fence - im going to sign up to both boiler courses and see which one would suit me better

[@LarsEelke]

Viesman makes decent boilers for big utility or swimming pools. The smaller units i have never worked with and from what i saw in your video ill probably stick with Remeha and Intergas 🙄 Greetings from the Netherlands

[@UrbanPlumbers]

Remeha went bust in the UK

[@LarsEelke]

@@UrbanPlumbers didn’t know. That’s a shame. Intergas is very good though, cheap maintenance. My costumers love those boilers.

[@mrbachittarsingh9243]

Found the heat only disappointing as well, it broke down after two weeks with ignition failure, spoke with viessman tech help we went through everything and they couldn’t pinpoint the problem so said one of their engineers will need to come out and look at it, won’t install one again.

[@UrbanPlumbers]

That’s not good. Although I did have Intergas fan fail after 2 weeks as well.

[@esuohdica]

Vitodens 100-w or Baxi 600 heat only? Thats my current dilema!

[@UrbanPlumbers]

it really isnt a dillema at all. Viesmann on PDHW with WC . Baxi can't do any of that.

[@aakozanoglu]

Have you ever installed a Daikin combi?

[@UrbanPlumbers]

It’s intergas with a Daikin badge

[@pro-powerflushing]

I powerflush systems all the time - yes I’m sure you probably know my thoughts on Viessman boilers rubber hoses / bad customer support / delays for parts I complained to wich magazine fir giving them Best Buy boilers !! Worst buy if you ask me I woud not have one if it was given to me !

[@vasilijekrunic9926]

When you pay for basic fitures, you get basic functions - I believe that You did not comprehend the differences between Viessmann technology and the competition when You mentioned the HEAT ONLY version. All of the things You said that need to be adjusted are explained in the parameter list. Advice: Continue installing other boilers brands ...

[@SuperWayneyb]

what’s your take on Atag boilers? 🤘😎🤘

[@UrbanPlumbers]

Never seen one. I am worried about trying them as they are direct sales.

[@SuperWayneyb]

@@UrbanPlumbers Worth looking at 👍

[@SuperWayneyb]

🤘😎🤘

[@andrewriley4204]

Their flagship is the 200 range. Below and beyond which, they are less good. The 200's, whilst remarkable are expensive

[@heatpump8566]

Prefer the cdi classic to most boilers. Years ahead of its time

[@UrbanPlumbers]

Yes CDI were decent

[@patrickwheeler2646]

Is there a good heat only? The system version is great, shame you couldn't get the extra pipes from the kitchen to the cylinder but that would have been difficult without dropping the ceiling.

[@UrbanPlumbers]

Not impossible, I run new 28mm mains that route to the cylinder, just much more work. The boiler works fine and the client is pretty happy with performance, especially WiFi monitoring. Yes, nest on 2 zones can’t do OT. I hear you can do OT on multizone with ESi controls.

[@jacbisgood2221]

ESI do multi zone OT, up to 4 zones with HW I think, Kimbo was showing us on his 2 day course. I was there the morning you released your ahsp video. He was singing your praises and called you a very competent engineer, and he knows his stuff. Keep up the good work mate.

[@jacbisgood2221]

PS I fit Viessmanns, love the boilers but the company are a bloody nightmare to deal with and my rep has gone AWAL

[@UrbanPlumbers]

I really like Kim! He got me started on this mad journey. I need to send him a. nice bottle.

[@UrbanPlumbers]

Haha - when I called my rep there was a voicemail - ‘ I am on sabbatical and when I come back I will not work for Viessman’ - 😂

[@andrewmillwardwatford9410]

I always thought Viessmann should not have sold the 100 or the 050 under the Viessmann brand. The 200 is without doubt the best boiler available. Unless you understand design it's not easy to appreciate just how special the 200 truly is.

[@UrbanPlumbers]

Doing 2 w200 this month

[@andrewmillwardwatford9410]

@@UrbanPlumbers we should talk some time. With your understanding of design a few links and I'm convinced you will understand my conviction to Viessmanns design superiority.

[@johnburns4017]

Why didn't you just change the doors? The heat only boiler was inside the living space. I agree with you. Viessmann are a decent boiler but way over priced. If you want a large kW 4 pipe boiler or cascading them, then Viessmann are good. Their control systems are good, especially the WC, where they do have an edge. For a single boiler installation of 40Kw or less I would tend to look at the Intergas range of boilers first. Or even using two staged boilers heating a low loss header or around a loop with close coupled tees. You highlighted the flexibility of the Intergas boiler control setup, and OpenTherm, so cheaper external controls can be used. The 200 Vidodens range of boilers are better than the 100. They are expensive as are all Viessmann products, but _not_ better build quality than Intergas. Then the Intergas leaves Viessmann behind on price.

[@UrbanPlumbers]

Viessmann sent us a replacement door that was supposed to be sound insulated.It wasn't. Heat only is in a utility room so not a big deal in this case.

[@cyril4892]

why UK version is not the same as the European version?

[@UrbanPlumbers]

Europe does not use heat only boilers

[@misstakenot9582]

7:16 "Scale protection" - how does that work?

[@UrbanPlumbers]

Electronic scale protection. I have no idea how good this one is, it was already at the property with existing CWSC

[@traian23us]

What’s the cylinder coil rated @ Also I would like to know how dit you wire up three port ? That’s v impressive With Viessmann it will be a difficult divorce to go trough once in love to product

[@UrbanPlumbers]

Nest call for DHW ---> Cylinder stat ---> 3 port white and grey wired together ----> orange to hot water demand box switched live ---> boiler fires at full rate ----> zone valve closes port to CH coil is 37kW - boiler is 32kW

[@traian23us]

@@UrbanPlumbers thanks v much you’re a star ⭐️

[@JasperJanssen]

What is the WiFi module for? Adjust temperature and modulation percentage and the like via an app? I’m not really convinced there’s anything a boiler should be telling the client via an app, except maybe a low pressure warning or the equivalent of a check engine light, let alone letting the average client adjust things, and an installer/maintainer wouldn’t really need a WiFi connection when they’re right there.

[@nikthegreek844]

nice job mate! where have you been!!!

[@UrbanPlumbers]

Here :)

[@nikthegreek844]

@@UrbanPlumbers also i would like you to make a video about coper pipe bending. this is not a techic we use alot here and i am very interested to see a tuttorial. hane a nice evening🙂

[@FrozenHaxor]

7:34 Is that a giant wasp/hornet nest on the upper right side of the roof?

[@UrbanPlumbers]

yes