Viessmann vitodens 100-W B1KF combi boiler (new 2021model)

[@paulwharton1850]

Thank you for making the video - I have just ordered one so this is gonna help me out a lot - I appreciate your time & trouble.

[@Rob-td1gh]

Do I need a vicare termostar to use the vicare app? Or maybe the vicare app just connects via wifi to the boiler itself without the vicare thermostat?

[@h.ibrahimcinar3151]

Not wecar

[@SayWhaaaaaaaaaaaaaaaaaaaaaaat]

@@h.ibrahimcinar3151 garbage answer!

[@thornhillplumbing]

You do not need vicare thermostat. The boiler connects to your phone directly.

[@KilkennyLights]

Well im buying that boiler ! The people in that house are super happy and cheerful so decision made. The fridge must be cooling the beer properly also but no need for eco mode just lash it out. Great video and very funny. Well done. Frank in Ireland here. MIF

[@thornhillplumbing]

That's great Frank stay warm and happy

[@mustafamuflehi4980]

I had the Viessmann Vitodon 100-W 32Kwh brand new (latest model). From day 1, it has been throwing errors and bamboozling gas engineers. I had it installed in Oct 2022 in preparation for the cold weather conditions in winter. I was only getting consistent hot water, but very little CH. It got to the point that I bought electric heaters to heat up my home. A Viessmann engineer refused to inspect the combi boiler since it is connected to my thermal storage. He said our combi boilers should not be connected to a buffer tank, and installation should be rectified as per the manufacturer's instructions. In June 2023, I brought another company to remove the buffer tank and disconnect it and put it right as advised by Viessmann. The boiler has started kettling, but settled down, but it is still not woking for CH, and when that same Viessmann engineer came in to look into the problem, he said it is short-cycling and that my CH system needs to be balanced! I have had nothing but grief from this boiler. My old IDEAL 13-year-old boiler was far more efficient, but sadly it has come to the end of its lifespan. I would not recommend Viessmann based on my experience. Not to mention, their customer service is poor. Stick to Worcester Bosh, Vaillant, Baxi or IDEAL. The installers are coming back to balance the CH to see if the short cycling will stop, but I am not holding my breath! Any suggestions would be greatly appreciated.

[@peso98]

It should be a problem with the system, their boilers are pretty good , atleast in my experience , i`ve monted more than 15 of them and they are all working perfectly.

[@thornhillplumbing]

Unfortunately you had the wrong installer in to fit your boiler. You cannot blame the boiler manufacturer for a poor installation.

[@mustafamuflehi4980]

Six months on from my last comment, Viessmann engineers are still coming to try to resolve the CL lockout. They checked the installation and have no reservations about how it is installed. My system has been powerflushed and balanced. Yet the water pressure still drops to 0.4 - 0.1 in less than 24 hours. The engineer replaced the pump and PVR as a precautionary, but he can't tell why the problem persists. No leak in the system for the pressure to drop that low in less than 24 hrs. All radiators were checked with no trapped air. The 5th Viessmann engineer visit is due in 2 days in a space of one year. My experience has been horrific from day 1, and not many gas engineers are interested in troubleshooting such a sophisticated boiler.

[@user-te1le7ck6b]

Awful to hear , I hope this was finally sorted as if not small claims would be your next bet

[@mustafamuflehi4980]

@@user-te1le7ck6b Only last month, the power control PCB was at fault, and a Viessmann engineer came to replace it. All these faults in less than 2 years. It is finally working as normal after 1.5 years, and I'm not impressed by the make overall (from my personal experience).

[@TheUK33]

On my settings Burner status is off. Should I turn on? And how do I turn heating up or down via app? On my thermometer in house temperature is 20 on the app heating circuit 75° . If I want to turn heating to 25° how do I do on the app?

[@keefdippy2886]

How can I get the app when there's no model number etc? We moved into a 2 year old build,we can get hot water but no heating.Even after bleeding,no heating. Help please?

[@sucitm8162]

Same problem...

[@cabottaxi]

I have this boiler fitted 1 year ago but the installers can't seem to be able to hook it up with the Honeywell Home controller. Currently I have to use the ViCare app on my phone to control it.

[@garyforrest7020]

I came across your very interesting and thorough video, you obviously seem to know your way easily around the Viessmann controls, I wonder if you or anyone here can help, I have 200-W Vitoden with the 7" digital screen, Do you have any idea as to how this boilers flow temperature can be reduced to around 60/65 degree, it is not weather sensor controlled, it's only control is by use of a Salus It500 thermostat to control temperatures required for the rooms. As I, for the life of me can't fathom how to reduce it, so surely there must be some form of control for that within the boiler on it’s digital screen settings somewhere, to be able to adjust the flow rate? so would be grateful for any directions.. Keep up the good work

[@normanboyes4983]

I have to answer your question with a question. Why have the very best boiler on the market that is perfectly optimised for weather compensation control (superb minimum firing rate of 1.9KW) and that is all built in and then not use it? You paid a premium price for this boiler and you have essentially handicapped it.

[@wing-cobiggles6602]

Nice clear explanation

[@Breakhoven]

Can I also setup the timer on 050 boiler?

[@dickiedubs3137]

So is this boiler a 30kw or a 32kw

[@littlej956ro]

Hello, i have underfloor heating and opentherm thermostat connected to this boiler, the problem is that sometimes the boiler loses connectivity with the thermostat and when the connection is lost the heating circuit blasts to 95C, if i reset the thermostat connection is restored and everything works correctly again, clearly this is a thermostat error, but is there a way to setup a temperature limit for heating circuit ? thanks

[@vlad330i]

Hi, How can i set the display to stay " allways ON " ? and not only that small dot ?

[@dickiedubs3137]

Does it have built in weather compensation

[@thornhillplumbing]

Yes. You have to use a veissmann weather sensor as they are a different kOhm to other brands

[@dickiedubs3137]

@@thornhillplumbing What are the part prices like in comparison to Baxi

[@Mikeoxlong1978]

@@dickiedubs3137that’s like asking what are the parts pricing like for a ford fiesta compared to a Ferrari

[@johhny303]

do you get much dissipated residual heat into the radiators when using the hot water? i just got a 050-w installed and it seems to be heating the radiators when the hot water is used. the engineer said this was normal but i keep reading about a stuck diverter valve being the cause of this.

[@thornhillplumbing]

This is not normal. If you hold the flow pipe while you are using hot water , and the flow pipe heats up , this indicates a diverter issue.

[@skateskalde5937]

my water heater just shows a warning arrow how do i restart it to get my hot water back on

[@TCMk23]

My plumber wasn't about to install our room stat when he installed our boiler because he wasn't sure how it work on this model. It's a two wire electromechanical switch. Do I need to wire it to L and N, or L and 1, or 1 and L?? Any tips are greatly appreciated

[@GODTRUEONE]

According to the scheme, it is connected to L and to 1. N is connected if a Vitotrol thermostat is used i think

[@TCMk23]

@@GODTRUEONE thanks muchly for the reply, I really appreciate it

[@peterhicks603]

Very interesting. Does this boiler require a 22mm gas supply? Our house was built 20 years ago and has an indirect type heating system with cistern tanks in the attic. A 15mm gas pipe goes from the meter (beside the front door) underneath the house to the boiler in the utility room at the back of the house. Some neighbours have changed to combi boilers by having a 22mm pipe fitted externally going around the house but it looks awful and we don't want to do that. Does the 15mm pipe mean we'll only ever be able to have a regular boiler and will have to have a direct unvented system if the current hot water/heating system fails? Thanks in advance. P.S. What area of there UK do you cover? Thanks again!

[@thornhillplumbing]

It depends on the KW of the boiler and how far the boiler is away from the gas meter. A combi usually requires 22mm or 28mm pipework to comply with the gas regulations. You would only be able to have 15mm pipework if the boiler was right next to the gas meter. I would look at your neighbours houses as a guide.

[@thornhillplumbing]

I cover Dorset and Cardiff areas of the UK

[@sipepguru]

Would you say the viessmann 100w is a better boiler than baxi 836?

[@thornhillplumbing]

In many ways the viessmann is a better boiler but the baxi is also a brilliant boiler and has advantages over the viessmann. It would depend on the size of the property and other factors to decide which is the right boiler out of the two

[@SayWhaaaaaaaaaaaaaaaaaaaaaaat]

Luna Platinum series you should look. good boilers.

[@retroandrusticlampsuniqued1936]

Hi, I had to remove the heat exchange as it was clogged so the hot water was fluctuating. It is now working but the boiler says AP and I cant get any of the front panel buttons to work, any ideas how to exit this AP mode ? Thanks

[@thornhillplumbing]

Hold menu button for 4 seconds then press up , then keep pressing OK

[@erdogankaplan8623]

Merhaba viessmann mı buderus mu yoguşmali kombi olarak hangisi daha iyi

[@user-te1le7ck6b]

ECA 😂😂

[@calendar64]

Does this boiler work with ufh , would it affect the water temp in the pipes ?

[@thornhillplumbing]

This boiler does indeed work with underfloor heating , this will not affect the temperature of the hot water or the radiators as the underfloor heating will have its own manifold, pump and blending valve so the temperature of the underfloor can be controlled independently to the rest of the heating.

[@SayWhaaaaaaaaaaaaaaaaaaaaaaat]

@@thornhillplumbing what have to be doesnt mean it will be. for example in my house radiators and floor heating is in the same manifold. floor heating pipes can tolarate 95c temps so its not doing anything bad to the pipes. limiters limits flow so floor is always only warm not hot even if my watter is at 65c going to the manifold.

[@simongarland5678]

I am wanting to connect Nest 3rd Gen to the 100w using Open therm. On the nest heat link the connections are marked OT1 and OT2 but in the boiler the open therm connections are marked + and -. Which one should be connected to OT1 in the heat link?

[@Smacktee]

Not polarity sensitive. Can go either way

[@simongarland5678]

@@Smacktee That's what i thought but i am getting error code 95 on boiler and H73 on nest. Boiler C:7 set to open therm. Driving me mad. Viessmann say ask Google and vice versa!

[@karoljack2070]

​@@simongarland5678 did you solved that problem?

[@simongarland5678]

@@karoljack2070 Yes. Someone had not put the connector block in the boiler the right way. 180 degrees out. So what i thought was terminal 3 (open therm) was actually terminal 2 (cylinder temp sensor) Worked straight away once correctly connected. If you look at the boiler wiring instructions you will see what i mean.

[@simongarland5678]

Does not matter what way around you connect the wires

[@toystories9491]

What size cable do you use to connect and breaker thanks

[@thornhillplumbing]

0.75mm

[@SayWhaaaaaaaaaaaaaaaaaaaaaaat]

@@thornhillplumbing :DD 0.75mm2 is for earphones not electricity.

[@jayseabie215]

When setting a max DHW temperature I assume that means the temperature of the water should not exceed that figure?? However mine goes way above the temp I have set. The smaller figure giving the current temperature goes up to 20c above what I set it to!! I assume this is not right?! PS I’ve only just had it installed!

[@thornhillplumbing]

That is correct. The temperature of the water leaving the boiler should be approximately what you have set the temperature under the tap symbol. You can try setting the eco mode to on (under the leaf symbol) as if the eco mode is off, the hot water will be pre heated. Also, the slower you run a tap, the hotter the water will be, but this should be limited to what you have set the hot water temperature to by tapping the menu button until tap symbol is illuminated. I hope this makes sense. The boiler will be under warranty so may be worth calling the installer to check with him, or to arrange a warranty visit from viessmann.

[@robperry7596]

I also have this problem, DHW set at 55 and still reaches 70 at the tap, did you resolve it ?

[@prymus141]

​@@robperry7596 how are the slopes for Heating circuits set? Do you have hygene function enabled?

[@lls737]

My water heats up too slowly, is there any way to speed it up a bit?

[@thornhillplumbing]

You have pipes running from the boiler to the hot taps/outlets. When you open a hot tap, the boiler will fire and send hot water to the taps. When you turn the tap off, the hot water that is in the pipes will cool down. The next time you.open a tap, you will have to run off all of this cold water..the further away from the boiler the tap is, the more cold water you will have to run off . The solution is to make sure all of the pipes are as short and as narrow as possible. 10mm pipes are usually sufficient for basin taps. Also pipes should be insulated and the boiler should be positioned as close to all hot outlets as possible. I hope this makes sense.

[@sparkyUK]

Why would it be less efficient to heat the house faster? I've always had my boilers set to Max but would you suggest lowering this?

[@thornhillplumbing]

Because the higher the return temperature, the hotter the heat exchanger gets, the less the boiler will condense and the more heat is blown outside through the flue and wasted. Also higher temperatures cause more corrosion in the system.

[@thornhillplumbing]

Get the flow temperature as low as you can get it . A lower flow temperature to the radiators will also make the rooms more comfortable as the air temperature will be more stable. You will then find you can turn your room stat down also which will save more energy.

[@sparkyUK]

@@thornhillplumbing Thank you, that's really useful info.

[@SalimKhan-gk1fh]

Very good informative video on this first class boiler I have fitted a couple now customer seem very happy with them typical viessmann top quality I have the older 100 series at home and that has been absolutely flawless. It’s 13 years old and all the composite plastic parts are still as new ? unfortunately you go to quite a few that are on contract servicing and have never seen a proper service or an expansion vessel pump up and this includes some of the big brand names!

[@thornhillplumbing]

Thanks for your comment. I too think this is a great bit of kit. It also saddens me how the service contract companies such as the insurance companies and gas and electric companies do not service their customer's boilers correctly yet charge their customer's every month. I'm not sure how they are allowed to get away with it. It clearly states in the manufacturer instructions how an annual service should be done.

[@SalimKhan-gk1fh]

@@thornhillplumbing No problem mate and thanks again for uploading this excellent video it’s a shame how the service industry is at the moment and it’s been like this for a number of years especially now with the younger generation entering the industry and as you probably know they are not interested in getting their hands dirty! My pet hate is the engineers who come out via the insurance companies to attend boiler breakdowns nine times out of 10 they don’t even want to remove the front case to see what the problem is! (if you believe this or not)Recently had an ideal logic that was gurgling obviously you guessed what the problem is ! yes a blocked condensate trap! one engineer diagnosed it as a faulty circulating pump The other point blank refused to remove the front cover and just said it needs a service! Just cleaning the condensate trap is not enough points to the fact that the heat exchanger needs flushing through the burning area downwards. Where I am [brighton Sussex) people have a lot of faith and respect for British Gas but these guys are the absolute worst!! It causes problems for example “why did you take an hour to do a service when British Gas can do it in 30 minutes?.

[@warkito]

thanks a lot

[@thornhillplumbing]

You are most welcome

[@ijs6962]

Are you aware if using a Vicare thermostat and you loose communication with your Wifi you will not be able to change the heating setting on the boiler, you will not have access to P1 or P4. If the Viessmann backend system goes down you will also have no access to the boiler, Its a flawed system.

[@thornhillplumbing]

Thanks for your reply. I not used the Vicare thermostat, and are using just the boiler and the weather sensor , using the weather curve offset to calibrate room temperature. I have also fitted a Honeywell programmable room thermostat in case there are any problems with the boiler being controlled in this way , so we can use menu C7 to switch to the room thermostat instead of using the boiler timer and weather sensor.

[@SalimKhan-gk1fh]

Viessmann have updated the system this problem is now resolved!

[@ijs6962]

@@SalimKhan-gk1fh I doubt very much Viessman have resolved this issue

[@ijs6962]

Is that boiler connected to Viessmann so they can monitor the boiler performance ?

[@ionuttofan4302]

Do i need outside thermostat ? I want to use a classic wall thermostat what option do i need to choose at C7

[@h.ibrahimcinar3151]

Dayı ne yaptın sen öle yavv 😂

[@MrRawMonkey]

Buy British!

[@pallsmortion4750]

So that's what a waste of money looks like

[@thornhillplumbing]

Why would you class this as a waste of money Paul? Interneted to hear your opinion

[@pallsmortion4750]

@@thornhillplumbing never been a fan, it's a personal thing, moved to a house with a viessmann combi, absolutely useless. Took it out and fitted a Vaillant, in 8 years it's never missed a beat. All boilers have there weak spot, viessmann to me, are a cheap boiler packed to a higher market

[@thornhillplumbing]

@@pallsmortion4750 thanks for your input

[@Elmasryq]

So you basically don't know shit about this model but talk shit on the brand based on your previous experience.