Blocked Plate Heat Exchanger Magnetite Sludge - Viessmann Vitodens 100

[@DenisDesrosiers-tf8ju]

This video saved me! I live in Canada and I have a Viessman CombiPlus. I was having significantly reduced water pressure on my hot water (the boiler was working well) which was making it difficult to have a shower. The local technician had never seen the problem before. He wasn't able to do anything for me on the first visit, but the next day he came back and I showed him this video and between the two of us, we were able to remove the heat exchanger and clean it. After that my hot water pressure was fantastic. I'm going to do this myself every year or so as a maintenance item. Thank you so much Allen! I live near the great lakes and we have very low mineral content in our water, but after six years there was enough build up that it significantly impacted pressure. At first it was intermittent and then it just kept getting worse. We saw no sludge when we cleaned it, just flakes of dark material. Interestingly, the part of the heat exchanger where the boiler water flows looked brand new and shiny.

[@SalimKhan-gk1fh]

Hi Denis, Glad to hear u fixed your viessmann, can I ask if the Canadian model is similar to our uk model? Does it have rubber hoses or metal? Thanks

[@dannybrasco7928]

Allen is the best plumber on youtube, got a wiesman 111-w and 2 services later, still got the seal.

[@mikebarron4929]

Those kind of jobs are really satisfying bet the owner was chuffed and you will have a return customer for life, it's all good.

[@andiyladdie3188]

Very good work, Allen! I wish more and more engineers to do their job properly, as you do. A friend of mine had the same DHW problem. He called the company that installed the boiler and they send some chaps. They did a flush to the main heat exchanger and totally ignored the plate exchanger that was sludged-up. The problem was partially resolved. He then called another engineer and he did all that you showed on this video. 🤘 👍

[@nl4050]

Great work and video Allen! Your ‘honest’ attitude goes a very long way. Readers and watchers, from a retired engineer, this man knows his stuff and would certainly gain my trust!

[@AllenHart999]

Thanks 👍

[@grimawormtongue2014]

​​@@AllenHart999hi allen, hope you're well. What caused that much muck to build up, esp in the rubber pipes? Which chemical was used to clean out the hx plate and can you use spirit of salt to clean? Also, why was the chemical not put in the other two holes?

[@andrewislam7295]

If you don't mind me replying? I've used spirits of salts in the past and has worked for me. The two uncleaned holes don't need cleaning/treatment/flushing as they have the clean tap water running through them, but the other two have the dirty, circulated water running in them, and the scale must build up inside the rubber pipes too. But I'm sure Allen will give you a more comprehensive answer.

[@grimawormtongue2014]

​@@andrewislam7295hi Andrew, thank you for your reply. So the two holes that were blocked, that was the water circulating from the heating system? Two holes for the heating and two for domestic hot water? Is there any way to unblock the plate without removing it?

[@monkeyboy8424]

Allen's knowledge, skill and work ethic sets the high standard to which all apprentices should aspire.

[@oby-1607]

Very professional diagnosis and maintenance repair. Felt very good to watch your progress.

[@bharatdalal8555]

Good to see you servicing Viessmann boiler. I have 2 of them in my property. Seeing you repair them shows how good they are. Good luck with the Chenal.

[@andrewislam7295]

Great, informative, straight to the point video. This is really helpful, thanks so much! If I may add one small point, sometimes it may be good to do a second round of chemicals in the exchanger, as the chemicals loses it's potency and therefore it's ability to breakdown/dissolve the sludge/scale.

[@matthewwilkinson8289]

I see constantly this issue with the Vitodens combis. I find it surprising a premium boiler maker like Viessman still using rubber hoses. Early Vaillant Ecotecs had similar material links in their pipework, before being phased out/upgraded. This rubber hosing seems a perfect material for magnetite/sludge/grit to gather in. Could be worse, I remember seeing the 80/90s Saunier Duvals..😊

[@nigellacey3803]

Was forever descaling them back then !

[@Jordan-io3zi]

Premium 🤣

[@geoffsample5273]

great vidio Allen this should be shown to all customers that are tight wads and dont want to pay that bit more for a proper service.

[@IsleofWightBushcraft]

Problem is, each time you take burners out, you’re supposed to replace graphite seals, which adds around extra £35-£50:00 extra time and materials onto service price. The burners shouldn’t carbon up anyway, and a flue gas analysis confirms burner ok. Burner seal only needs to be changed every five years on Vaillants. So periodically, yes, take burners out, brush main heat exchanger, pour jug water or two through heat exchanger, fit new seals, including electrode seal. But this doesn’t need to be done very service. It would be like putting new tyres on car every year, when there’s still plenty of tread on them. So thought it a bit unfair to suggest that burners should come out every service. Just saying.

[@moroccanyourworld7425]

Great Work! What type of chemical did you use to clean the heat exchanger? Thank you!

[@jaybee258jb]

Excellent. Very informative. This is good knowledge to help guide me in agreeing the go ahead of boiler repairs. I find some gas engineers seem to just keep replacing parts till it's fixed, or we just give up and replace the boiler. Repairs are expensive

[@metsogrand]

I am waiting on a Viessmann gas engineer to do the very same thing . I have the same problem in spite of the boiler being serviced ?? every year .A great video to see and less messy than I thought ,thank you .

[@trevorjarvis3021]

Brilliant service Allen, I should think the customer was well pleased 😀

[@projects4home]

You are a super nice technician! Love your calm mood and doing much beyond what other average guys do! Thanks for the insights

[@AllenHart999]

Thanks very much for your comment, please consider subscribing to support the channel 🙂

[@32dartsking]

Hi Allen good vid as usual, not complaining about you saying the boiler was not serviced properly because you are correct in what you say, But when i went on viessmann course at their headquaters i remember the guy saying so they come with a 5 yr warranty so you do not have to take any thing apart and after 5 years tell them ( customer ) to get out vissmann. going to do this very same job that you have just done later this week, i hope it works out with the same result.

[@AllenHart999]

Thank you for taking the time to watch my video.

[@ciscoenerlorfrancisco3520]

TOP professional Allan! Another satisfied customer.

[@kingjoc1000]

Good repair, I have the same job as you here in Spain, here the water is so hard that in some repairs it is impossible to clean the plate excharger, greetings from Spain.

[@AllenHart999]

Sorry to hear that

[@AllenHart999]

Happy Christmas

[@sdlillystone]

Just needs cleaning every 6 months months not every 2-3 years

[@MAFp]

I never comment on videos but just wanted to say, fantastic video that mate. Great work. 👍🏻

[@halfclappertopchedda]

Allen, I have this exact tankless water heater. When we are trying to get hot water it get to temperature and then the boiler flame shuts off causing the water to run hot and cold hot and cold. Would this be the plate heat exchanger that is gunked up? My plumber recently did a flush of the system. And we are just waiting for gaskets to do the plate exchanger, if you were to guess would this be the culprit? Thank you for you video. You are very helpful. Take care.

[@91099Babar]

ALLEN , WOULD YOU MAKE A LONG VIDEO ON BOILER SERVICING , PLEASE ? 🙏 . WHAT IS THE DIFFERENCE BETWEEN TANKLESS HEATER, TANK HEATER, BOILER AND GEEZER ?

[@AllenHart999]

kzbin.info/www/bejne/qnbVno2Jnc2NpdE

[@Moho-bits]

Great video! Very clear and matter of fact. It's given me the information/inspiration I need to attempt this job on my boiler (I am an engineer with extensive DIY skills).

[@AllenHart999]

I would only ever advise a gas safe engineer to undertake such work. The boiler will need checking for safety afterwards, Thanks

[@paulballantyne7602]

Enjoyed it, very professional sir.

[@jameshanley1772]

Great video Allen. Could you explain where the brown gritty material in the plate exchanger may have come from? Thanks!

[@AllenHart999]

Thanks very much for your comment, please consider subscribing to support the channel 🙂

[@adamjohnston5250]

Hard water area

[@bigbawsdogg]

Wish you were down south to do mine. Useless plumbers everywhere.

[@kaganarisut]

hello. very nice video. thanks. I want to ask that on 11:22 , what is the name of the part you are opening it with a key, and I guess that some cleaning on that. is it necessary to take care of it?

[@factorclassic]

Nice to see stainless steel components that can be descaled with acid. Would proper power flush do this job instead, using FX2 for example? Rest of the system cleaned as well.

[@eurostarev9761]

When I do a plate H/Exchanger clean, I take it back to workshop and pressure washer both sides back and forward, you'd be surprised the amount of gunk that hides even after normal flushing. Also Always, always use eye protection when using that stuff. I hate rubber hoses on boilers, it's always a surprise to see this from German manufacturers. Good channel, I'll let you know shortly what I've found, what fits what, with press tools.

[@SalimKhan-gk1fh]

A really good video to watch Alan I’ve done quite a few of these on other peoples viessmann installs the ones I’ve fitted onto clean systems Have not had a problem at all, I haven’t tried a chemical yet that will remove the black sludge magnetite the only way I found to clean it is to plate off and jet wash it properly reverse flushing as well and the same applies to the main heat exchanger. I’ve got a VAX Aqua Vac which are used to suck dry the heating system water which you attach to the heating or the flow hose,or even the kitchen sink tap , It works a treat every single time. Viessmann Boilers are brilliant but you never see many well maintained

[@dalenewson4868]

Good video thanks. Just be careful to check the rubber grommets (100W) on each of the holes where the heat plate fit are still there before you refit it. Luckily I found mine had fallen out prior, you need to physically check with your hands as you are working blind, otherwise you may have a bit of a leak at the back.

[@chrisnixon5848]

Good video, Done like it should be. I use the Milwaukee 12v air compressor for charging the expansion vessel, cracking bit of kit and so much easier than a foot pump.

[@tazba5551]

As well as the heat plate the flow switch on this and the 050 can model can impact the hot water performance

[@AllenHart999]

Blocked hoses could effect it. Thanks.

[@AllenHart999]

Thanks very much for your comment, please consider subscribing to support the channel 🙂

[@vickysm2878]

Great video! When the heat exchangers get blocked up do they need replacing?

[@FrankCastle82]

Is this a standard thing that should be done at a regular service? The reason I ask is because I have a boiler (4 years old) and we have insurance on it for breakdowns, it is serviced every year, but the past week we havent been getting hot water, an engineer came out (from the place we pay insurance to) and they have said its the heat exchanger that is broke due to sludge build up, and its not cover under warranty, but surly all this should have been checked when servicing, and it should have been prevented? All he did to diagnose was take the front cover off, he didnt strip anything down or even try the hot water, just took off the front cover and looked at it.

[@AllenHart999]

Thank You

[@stevelambert6689]

Was there a system filter installed with water treatment to prevent picking up in the first place, if not will you not be back in five year's or less time?

[@ianm1470]

Very informative video Allen many thanks ~ the customer must be delighted I’m sure 😃

[@AllenHart999]

Yes, she sent me a really nice message afterwards and made a donation to my chosen charity.

[@matthewrenolds7960]

Love the vid. What cleaner did you use and how long do you leave the cleaner in the heat exchanger itself?

[@maxnavsa4470]

Allen, would be easier and better to change rubber hoses, and put new ones on? Instead off trying to squeeze them to get the muck out. Trying to clean them is pot luck, you will never know if all the muck has come out. Love these types vids. Keep up the good work.

[@ArshKhan-yu7bg]

Thanks for this great video. Insurance company said the exchanger is full of debris and they dont want to get a new one unless i pay although they have been servicing it for two years but never raised this ascan issue. Any ideas what i can do please? We are an elderly couple

[@dickiedubs3137]

I'm surprised Viessmann with the rubber hoses considering the problems we know they cause. But thankfully newer models don't use rubber

[@neilparkes8084]

What’s the cleaning product for the plate heat exchanger?

[@michaelmeehan1234]

what descaler did you use Alan.? Good video. if it was installed correctly,system flushed, and serviced regularly,inhibitor added and checked,this should not happen.

[@richardkift5882]

Hi Allen Your help would be very much appreciated, especially with the weather forecast for this weekend. Our Viessmann Vitodens 100 was suffering with the symptom of the hot water coming in and out (not good in the shower), our plumber has replaced the plate heat exchanger (his first time working on a Viessmann) but when he came to turn the boiler back on it refuses to fire. The power is on and two orange lights come on the right hand side of the control panel and green on the left, but the display only shows the shape of a house with nothing else and no fault code. The fan & pump seem to be running. Have you ever experienced this as our plumber is at a loss? Hopefully you can help

[@AllenHart999]

Its hard to say without testing it. Might be better to get someone out who knows how to repair Viessmann Boilers. Has he checked the hoses?

[@spencerwilton5831]

Have you any experience with intergas boilers? I'm tempted, I like the idea of no diverter valve, no secondary HEX, interchangeable parts across all models and an apparently indestructible main heat exchanger. Problem is no plumber I speak to has installed one or attended any problems with them. I hate combis and vowed I would go for a megaflow type system when the time came, but financially a swap to another combi makes more sense right now for me. Any thoughts appreciated! Three bed detached, doesn't take much heating, hot water use relatively low as just two of us here but we do like a good powerful shower.

[@AllenHart999]

I will add a review soon. Thanks.

[@peterrielly9499]

Intergas is 👌

[@miketaylor803]

Hi Alan - thanks for all the great videos did you only use the celaenr on the boiler side (not the cold water mains) of the plate heat exchanger? I have the smalle Viessman boiler and it's been great until about 3 months ago and now the hot water knocks and bangs / kettles I was told by the installers about 3 years ago not to use inhibitor in the system as Viessman have a stainless steel heta exchanger / burner - but if the plate exchanger is clogging up then this must mean the system has muck and debris in it... I am going to isolate the boiler / drain it then take the plate exchanger out (it's really easy on this model as its right at the front and a couple of screws) and then clean it as you suggest After replacing it would you suggest adding a cleaner & running the system for a few days followed by a full drain down and refill + inhibitor?

[@joycebennett6709]

very interesting to watch how the boiler works. we have a problem with my boiler we have a viessmann engineer coming to check what is goin on?

[@SalimKhan-gk1fh]

What was the problem with your viessmann boiler ? and did you manage to get it sorted out, what did they have to do to it for repair it

[@andrewhowarth7260]

Hi Allen Thanks very much for these videos. I have this problem with my viessmann boiler it's the second time I've cleaned the plate heat exchanger and the pipes. Is there a solution to stopping this from happening again?

[@9P38lightning]

Great video Allen how much would this service cost today…

[@cliveramsbotty6077]

not sure if you do requests, but any chance you could call it 'viessmann wun oh oh' on the next video?

[@AllenHart999]

lol

[@SalimKhan-gk1fh]

clive ramsbotty Very funny clive! you mean as opposed to the viessmann wun wun wun!

[@ИльяПанчук-ь9ю]

Hi Allen. Very good job mate. How do you know if the plate is good enough for unblocking/cleaning or it needs a replacing. Just trying to save some money for my future customers 👍

[@nishapanchal5608]

Hi, I've got a Vitodens 050-w that was only fitted less than 2 years ago. Our shower keeps running hot and cold. When the shower is running, the flame comes on, ramps up, then goes out, on again, and so on. Doesn't seem to affect other taps in the house, just the shower. The boiler pressure was low, hovering just above 0bar so I've sorted that (thanks to your video!) but thats had no effect on the temperature issue of course. I'd like to have a rough idea of what the issue could be so I know I'm getting the right advice when someone comes and looks at it....thank you so much!

[@markdavies3715]

I also have a vitodens 100 and the last service I had all the chap did was clean out the inside heat exchanger with a brush!!I am now having problems with the hot water to the shower varying in temperature albeit taps etc are generally ok. Would a partly blocked heat exchanger cause this? there seems to be some variation in hot water pipe to shower although I'm not sure if this is a problem with shower demand/flow ( it is a pressure balanced shower not thermostatic)guess I am going to have to wait until lockdown is over in any case!

[@AllenHart999]

Stay safe. Watch this one just in case. Thanks kzbin.info/www/bejne/fpmYnXl5bLt8arc

[@ghazanfarhussain5171]

Hi please send me your phone number I can call you I from Bradford

[@SalimKhan-gk1fh]

It’s not supposed to be brushed out with a brush mark, it’s supposed to be vacuumed out and thoroughly rinsed out with water Sounds like you’ve got a partially blocked heat exchanger

[@spencerwilton5831]

Salim Khan veismann make a dedicated heat exchanger cleaning tool. It looks like a miniature builders trowel, but with serrated edges. The gaps between each spiral are exactly 0.8mm, the blade of the cleaning tool is designed to just fit. You work around the spiral, gently pulling backwards and forwards to clean any crap from between the coils.

[@jonski3910]

I have a 050 Veissmann and had this problem. Veissmann engineer came out and replaced the heat exchanger, but warned me I needed a system flush. British Gas came and did it at a cost of £739, but did NOT flush out the exchanger, less than 6 months later, with a service in between the damn boilers giving me the F2 fault again. Should British Gas Have flushed out the exchanger after they did the flush?

[@mickemmett6828]

I had this problem with my Vokera, I removed the heat exchanger and gave it a good flush out but nothing much came out. In the end I fitted a new one and it cured the problem, unfortunately 3 years later the pressure in the system is now going up by itself; even with the feed pipe disconnected so it's looking like it may have a split inside the new heat exchanger now.

[@johnburns4017]

It needed: *1.* A filter on the return; *2.* X800 run in it for a number of days; *3.* X100 put in. Allen, what chemical did you use to flush the plate?

[@Rickblues46]

Prior to touching any part of the gas system .. did you do a soundness/drop... test and gas rate check To give yourself the base line figures ??

[@wolverineqtg976]

Great video, thank you. Would flushing the exchanger with boiling water and citric acid be as good as the chemical treatment used?

[@AllenHart999]

How would you keep the water boiling? Thanks.

[@wolverineqtg976]

@@AllenHart999 disolve the citic acid before hand in boiling water via the kettle and let it soak inside the heat exchanger? asking to learn

[@edwardbalboa5528]

@@wolverineqtg976 vinegar

[@wolverineqtg976]

@@edwardbalboa5528 thx appreciate it

[@kostas010151]

@@edwardbalboa5528 the liquid he used does not look like vinegar!

[@tactiletools2427]

Great vid, try pouring boiling water (CAREFULLY, it reacts explosively if you drip it onto the acid de-scaler!) into the clean ports of the plate heat exchanger, the results are immediate and obvious!, best to do it outdoors!.

[@jimmykelly4323]

Hi Alan what kind of chemical do you use for cleaning the heat exchanger ? Kind regards Jim

[@andrewross1343]

I'm having an issue with my ideal logic es35 having problems controlling heat in shower would this be the heat exchanger

[@linas898]

Great video Alan, I have viessmann vitodens 050-w and when I set hot water on 40 degrees my boiler shows about 60 degrees, why is that? Thanks

[@nmdw83]

Mine does this too

[@paulkelly3254]

Have you ever used spirits of salts for plate heat exchangers Allen? It is strong stuff but the results are second to none, just need to thoroughly flush the exchanger after, I’ve never had any problems using it. It is pretty strong but the results are excelllent👍🏻

[@ryanlove7451]

Paul Kelly Whare do you get spirit of salts my mate recommended it I’ve got a plate on a turbo max to do is one shot just the same ?

[@paulkelly3254]

You can get it from Homebase, H&G make it, it’s 23% hydrochloric acid, so wear gloves and don’t breath the fumes. It’s twice as strong as one shot. Flush it thoroughly and it should be good as new👍🏻

[@olalekanoyedokun4494]

Spirits of salts does the job better

[@AllenHart999]

I haven't used that no. Thanks.

[@steowens8243]

Spirit of salts is too violent for me, that shit will scar you, one shot isn't that bad if you get it on you and long as you wash it off and it gets the same results imo

[@leejones3377]

Hi Allen, do you cover WF10? I've got a similar problem of intermittent hot water. Thanks.

[@AllenHart999]

I don't

[@JonathanTurner-f6m]

Is this a common fault on these boilers . Been in house 7 years almost and had this problem twice . Now again this year happening again . New rads 4 years ago and flushed but again same problem back again

[@charliewillis8527]

Nice job Allen do you replace the door seal and how does the condence trap come out thanks

[@ashbyts3900]

Hi Allen Great video a few queries regarding domestic use. I currently have a Viessmann 200 W installed with a Spira-Cross low loss header fitted, light industrial pump to add to the circulation but in just over 3 years I've ditched two heat exchange plates. I've spoken with the plumber regarding dirt separation but the header should take care of this, I've also mentioned the hard water within our area and possibly installing a water softener. Do you think this could help??

[@lance4613]

Hello Alan, I serviced the exact same boiler today with the exact same problem. It appears you have to remove the main heat ex to replace the right hand side flow hose though ?

[@AllenHart999]

Yes.

[@lance4613]

Not a particularly clever design I’m afraid. As you’ll know Vaillant had the same issue with their “ Rubber Hoses”

[@AllenHart999]

Lance Taylor I don’t mind them really. Very easy to work on and you can always bring them back to life.

[@lance4613]

@@AllenHart999 I agree

[@rogerlambert7334]

I have the same boiler. It was installed on a brand new install, all plastic UFH, no iron anywhere. The pipes block up every year with the black crunchy stuff. Veismann blame my system without explanation. There are filters, and the sight glasses in the UFH manifold are Cristal clear. I am thoroughly sick of this boiler. It has also had two new HT leads. Again, I was told this was a rare problem. So rare that the person sitting next to me at work had exactly the same problem on the same day. Our service visits were concurrent. My next door neighbor has a boiler on the same water supply for 20 years no issue. So come on Wiesmann, step up and sort out your crappy rubber pipes.

[@brendonoreilly2143]

Nice one Allen what chemicals do you use pal??

[@AllenHart999]

Thanks very much for your comment, please consider subscribing to support the channel 🙂

[@jamesholden5691]

Would love to know the best chemical to use on blocked Heat exchanger if you could please share what you used

[@rajeshmaharjan7741]

Hi Allen,Thank you for your video. I want to know something about my Worcester 24 CDI boiler. central heating is working fine . Before when i turn on hot water on tap boiler machain shows light on tap sign and light on fire sign but now it does not show light on tap sign on boiler and hot water is also gone. Near boiler there is small box with green light when it on hot water come up but for some time again green light goes off automatically. When hot water come then also there is no light on tap sign on boiler . Thank you

[@johnburns4017]

What are the views of the rubber hoses? _Quality_ hoses on car radiators/heaters can last well over 20 years and 175,000 miles or so. They reach temperatures higher than domestic boilers. Latex radiator hoses just do not go wrong. More expensive but worth it.

[@HektorBandimar]

Why does my hot water flow to my kitchen sink keep stopping unless I constantly increase the flow? It doesn't do it to my bathroom taps or my shower, Vaillant Turbomax, installed in kitchen.

[@cricketlover1704]

Why do some gas engineers want people to buy new boilers when it easy to get parts and fit them . Just like a car you dont go buy a new one if the fuel pump or breaks fail . For example i have worcester bosch main heat exchange 301 r. National spare part sell them for 80 pound with a year warranty . However some many boiler men dont want to touch it . Is it case of lack of experience? I mean how much should it cost to put in new heat exchanger just for the labour.

[@robertpilkington4442]

Why didn't you clean the other side of the other side of the h.exchanger while it was all stripped down isn't it likely this will also be suffering from limescale if it has been in service for several years?

[@hawkins7331]

I have no water coming out the hot tap, any ideas what the problem could be?

[@brendanfisher2528]

It's hard to do a proper service. If you say to a customer you want £75 + parts for a service there is always someone doing them for £30 and just FGA in and out. Cant compete

[@SalimKhan-gk1fh]

Yes Brendan it’s lowered the standards of quality and no one can compete with a £30 FGA guys the ultimate losers are the homeowners Who think their boiler was serviced when it actually isn’t.

[@richardking6066]

I've been paying £8 a month for 'Boiler Service cover' (£96 pa) Only once in four years have I seen a technician do anything more than (what appeared to me to be) a cursory inspection! ie he seemed to be checking the flue gases, pressures etc etc. None of them has ever checked that the magnetic filter is clean of sludge (it is, because I do a full mains flush and re-inhibit, every two years). I've come to the conclusion I am probably just being ripped-off, and would be much better off employing a good local technician myself and getting a full service done. But, as an ordinary member of the public - how am I to know what the service should really consist of - and if I am receiving a descent level of service??

[@stevenyearnshire1624]

Such a common problem with viessmann combi boilers and why don’t engineers strip down and service service theses boilers so quick and easy to do a full strip down I love to strip theses down

[@SalimKhan-gk1fh]

steven yearnshire it’s a common sight these days I see it all the time , your modern engineers gasfitter are a real lazy bunch these boilers are very easy to strip down and I actually get pleasure out of doing it on viessmann’s

[@moorefyre9381]

Nice vid Allen just wanna say I believe they make the plates so u cant replace them back in the incorrect position. But in training they always say exactly what u said

[@AllenHart999]

I was actually told you can install them the wrong way on a Viessmann, never tried it though.

[@glenstead1377]

Hi Allen, i have a biasi boiler m90e 24s, i was hoping you might know if the heat exchanger is at the back of the boiler and if it is easy enough to get out and also what descaler would you recommend if i can do this. Im an electrical engineer so quite mechanically minded, the only thing i dont want to do is mess with any gas pipes for obvious reasons...thanks very much in advance...👍🏼

[@Rizsparky]

Would a blocked heat exchanger cause issues with heating my radiators? My hot water takes about 30 seconds to start being hot, but my radiators are not warm at all they stay cold, the boiler sometimes shuts down with an F2 error

[@kulespi]

Need advice. Living in south east Europe. Vitodens 100 W, boiler is 6 months in use, apartment is 40 m2, boiler brings hot water to the shower, and kitchen, pipes are less than 4 m long from the boiler to the faucet. Floor heating. While heating is on, I open hot water, use it normally, close it and when I want to use hot water after a minute or 5 min again, it takes 25-30 seconds for the warm water to arrive. Same thing in the bathroom and in the kitchen.So, example: I am having a shower, for the first rinse I wait for the hot water to come, ok. Than I turn the water off, scrub with soap for a minute or two, turn water on again and than I have to wait for 25-30 seconds for the warm and than hot water to arrive. And like that every time again waiting for the hot water. When the apartment heating is not on there is no problem. Is it the heat exchanger or a three way valve? Faucets are regular, nothing fancy, no thermostat. Please help. I would like to have some idea before i call the repair person.

[@SH19905]

I have had the same problem with a viessmann, had 3 new heat plate exchangers so far. Would i benefit from a powerflush? My radiators are getting hot which is good and so is my tap water but all 3 heat plate exchangers ive had have broken because of rust, sludge etc?

[@AllenHart999]

Might need a powerflush doing correctly and the hoses checking. Thanks.

[@Jimmy3305]

Hi Allen , love the content by the way, got a problem with the hot water on our boiler. Unless the heating has been on all day to the point where the house is like 23 degrees we don’t get hot water, it’s a vitodens 100 on the front of the boiler it has one dial. Which is for radiators. We never had an issue, untill we had the new boiler fitted it’s been frustrating for about a year. But the house gets far to hot, we set the thermostat to 21, if the hot water is switched on there is a switch in the cupboard where the tank is. The heating gets to 23 degrees or higher, even though it’s set to 21 on the thermostat. Any suggestions cheers

[@CoolMusicToMyEars]

Hello Allan, I've got a Viessmann 200W 7248829 series, it's about 13 years old Origional Water Heating Pump, do you get problems with these, the Flow to all radiators is very Hot but the return on all radiators is cool, all radiators heat at top cold 1/2 way down, they say that the pump is been upgraded to a 7874668 thats now got a control circuit output to the KM Bus I presume to the main Control PCB (145 X4.1 & X4.2), I was thinking about getting the system flushed, it uses 10mm microbore plastic pipe, I be honest it's never been flushed in it's life, the usual addative has been used and air has always been removed from the system, I was thinking of changing the 2.4uf capacitor in the pump it's a rebadged Grunfos pump head with just the 230V AC mains feed, from that pump there is no KM control Bus whatsoever ! It's my own boiler, I'm wondering if you come across this Viessmann upgrade to their pumps using the Viessmann KM Bus on the 200W 35kW Combi Boilers? It's still a modified Grunfoss GHE Pump probably about 7meters of head.???

[@lewisconway6431]

Hi mate, how long was you there in total ? What would you charge for a service like that. Other people offer "services " for 50/60 quid but it's obviously a quick telegan and they're out the door ?

[@paulhealey2984]

Why not tell us the 'chemcals' used for cleaning plate?

[@JWS1968]

I was told Plate Heat Exchanger by every man and his dog when my hot water was only warm and the flow rate was very poor. I cleaned it and had a small result but nothing significant. Then I got a real plumber who knew what he was talking about and he diagnosed the issue accurately. My 'diverter valve' was at fault. It was changed and the results were dramatic. All of a sudden the boiler was operating like a new boiler again. Piping hot water with a very healthy flow rate.

[@jimrowland56]

Hi Allen, I have exactly the same problem with my boiler and a engineer came out last week and told me it's not worth fixing as it would cost too much.He said I should buy a new boiler. Is he conning me? What's your opinion on how much this should cost. It's a Maine Combi eco 30 and about 10 years old, thanks for your time, Jim Rowland.

[@steowens8243]

If it is just the plate heat ex then yeah it sound like he ripping you off, even if you changed the plate instead of cleaning it the parts probably between 50-100 quid and an hour's labour, as long as that's the only thing wrong with it ofc

[@rhydianjames2547]

Great work Allen, what did you use to flush the hoses out? Or do you just replace them. Kind regards Rhyds

[@AllenHart999]

I just cleaned them out the best i could, I have another next week to do. Thanks.

[@bigpicturesstudio]

Allen good video. What sort of money do you charge for doing that job?

[@andrewscourfield7530]

Great video alan very informative

[@alantagg57]

Hi Allen. Do you put the crunchy hoses back with the original O rings or use new ones?

[@alantagg57]

I want looking for an emoji Allen. Yes or no please. Do you fit new O rings when you refit the hoses?

[@Kevinwhite-cb9fe]

Hi Alan. Do you need to replace the 4 seals on the heat ex with new or will they be fine to refit. (Asking for greenstar 30si

[@davidbradley296]

Try using SDS+RTD. It is a safe-acid used by US Navy on heat transfer units, including potable water. SDS+RTD is inexpensive, hand safe, non-corrosive and environmentally friendly.

[@vite1968]

Hello, pls could you leave a name of that cleaning agent you used for cleaning the heatexchanger, also did you clean the whole boiler with this solution or just the pipes and exchanger? Meaning.. if you pumped up the whole system with this agent to clean it, or you just did those two parts and i was not necesary to chemicaly clean the rest. Thank you

[@etch667]

Would Adey mc3 be a good choice for cleaning the heating side of the heat exchanger? Looking for advice.

[@user-te1le7ck6b]

Fantastic work Allen Did it have a magnaclean and limescale filter fitted ? Also what would your charge be for this level of work roughly of course but great to see care and pride in your work , wish you was down south for some of us Folk. 👍

[@AllenHart999]

No filters, I didn't charge. Thanks

[@williammcgrattan9583]

Quality service that👍

[@rodgercostello9814]

@@AllenHart999 can you come do mine lol

[@tazba5551]

@allenhart. Really been enjoying your videos mate find them very informative. Im in a similar predicament. I have the veissman 050 model and I'm no longer getting hot water. It goes stone cold. The heating is working absolutely fine no issues. Any idea what could be causing the problem with the hot water and what remedy if any can you suggest. Thanking you

[@AllenHart999]

Plate maybe?

[@tazba5551]

Hey thank you for the response. I've had the plate taken out and put through pressured water however could not do it on the hot water at the same level as the hole is much smaller. Unfortunately this didn't fix the issue I've seen the plate is available in stock at plumbase and I'm thinking of replacing the old, however I have a feeling this won't resolve the issue. Would it also be a good idea to change the rubber hose at the same time. Thank you again

[@AllenHart999]

Taz Ba I would do a water sample first, maybe the system is sludged up

[@tazba5551]

Am I right in thinking if it's sludged up it will need a flush out

[@oliverjeffcoate4138]

Hi Allen. Great service! Wish all engineers were this thorough. I have an issue with my open vent Vitodens 100w 16kw boiler, system has just been power flushed and a new pump installed. However it keeps short cycling when getting up to temperature, I would say it fires up then shuts off about 8-10 times before then constantly staying on until reaching around 70 degrees (it then seems to cycle 50 degrees to 70 degrees fairly well). Also, lots of hissing coming from boiler when starting. Have you got any ideas? Thanks Allen.

[@AllenHart999]

Thanks for the comment. Happy New Year.