Worcester Bosch or Viessmann | Worcester Bosch 8000 Vs Viessmann 100 

I like the sound of the internal parts on the Viessmann, they sound better quality? I have a victorian house with 3 floors. Does this have any bearing on boiler choice, i.e the height that the boiler would be pushing water upstairs ti the top floor? Pump and expansion vessel, does it matter? Also is it worth installing an inline water softner at installation, does it help to maintain efficiency of the internal parts and heat exchanger. Just thinking of trying to do the best job at installation as possible in regard to boiler life and efficiency. Does @Heatable also upgrade radiators at the same time too and open therm sensor to the boiler. Apologies for many questions 😉

The difference between a warranty and a guarantee as I understand it is with a warranty they will investigate any problems and put them right but not necessarily free of charge.A guarantee will ensure problems will be fixed without charge.

Bought the Viessman 100 a year ago. Only problem I have is trying to bind it to a Honeywell T3 room thermostat.

Viessmann all the way

Morning Guys, I am moving in to a 3 bed bungalow and want to upgrade to a combi boiler, there's 10 rads , there's an ensuite bathroom with electric shower and separate bathroom with bath and power shower, currently the boiler is in garage. I want the best efficient boiler/ hydrogen ready money can buy? Any advice would be much appreciated, kind regards Danny uk

What are the different modulation ratios? We have ufh as well as radiators and are looking to stop the boiler cycling too much. Thanks Ray

Will acidic feed water be an issue on the cast iron Bosch?

I’m Worcester Bosch accredited, but they don’t support Open Therm and I believe that the Viessmann does so you could use 3rd party Weather Compensation such as Nest on the Viessmann but you would have to use the Bosch Easicontrol for this function on the Worcester and it can not run all types of system eg S-Plan + UFH etc, Worcester should add Open Therm then it would be the best product in my opinion

Are there any other good brands that have a stainless steel heat exchanger?

Totally agree about the instructions, they are really poor and illogical. Don't understand why the wi fi QR code isn't left in the user folder.

Just some info based on my experience of combi's. The boiler cannot do two things are once. It cannot give you hot water for shower or baths and keep the heating going. So in winter you get up. House is nice and warm. Then the family all hit the showers. The house cools down noticablebly. I had a Vallient eco tec 937 fitted. About 7 years ago. Something to consider. Folks.

Nice video but misleading about the stainless steel main heat exchanger of the Viessmann being better in a hard water area than the Worcester's Aluminium one since the main heat exchanger water is virtually never changed and should always have a corrosion inhibitor added at installation (such as Fernox). Both boilers will have, I imagine, grade 316 stainless steel hot water plate heat exchangers for the HWS. To be picky saying the Viessmann has a stainless steel main heat exchanger is meaningless without mentioning the grade, again it's almost certainly grade 316. N.B. Worcester from day one (of their manufacture of condensing gas boilers) have added Silicon to the melt of their Aluminium castings for their main heat exchangers, which increases considerably the corrosion resistance. Wall thickness of the Aluminium main heat exchanger is, I believe, 6 mm + but the conductivity of the Aluminium is so good that it isn't an issue.

All Worcester Bosch boilers since the year 2000 are Hydrogen ready. Why are you saying the 8000 style isn't?

ALREADY FLAWED!!!!!!! VIESSMANN 200 Series is the direct competition and comparison!!!

Just arranged to have my old system boiler replaced with a WB 8000 so found this video very interesting. 40mm high? I never realised the WB 8000 was so small :P

Surely both boilers should start @ 15kW, a 10 bed house might need 30kW assuming reasonable insulation. Disappointing that the WB doesn't have a stainless steel heat exchanger. 2-0 to the Deutschlanders.

You need to up your game and explain the pros and cons of each boiler v price and then ask for a preference from the customer. Just quoting a price and a boiler doesn't cut it for a well informed customer. I'd rather have a quality boiler with a higher price but others maybe the price is all.

Viessmann every day of the week - BUT I would recommend the 200-W. It is the most advanced and efficient gas boiler sold in the UK! The 100-W is a UK only budget model that isn't sold in Germany. One other side fact - Viessmann is a family owned business still.

I have just had a viessmann 050-w fitted 2 weeks ago, its to high tec for me .There were poor instructions for the home owner, in fact there was'nt any. I had to phone the installer for information I was affraid to touch any thing on the boiler in case it shuts down. I also don't like the use of the app, loose the internet and there's not heating. If it's off you can't put it on and if it's on you can't put it off . Too high tec for me.

40mm means 4 cm tall? You 40 cm or 400 mm even that still small.

Neither, Vaillant only boiler worth considering

Ones a plastic piece of junk, the other is German engineering. Is there really a choice

DEFINITELY WORCESTER BOSCH IS BEST