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  1. mars_man

    Viessmann boiler question

    Wondering if there are plumbing gurus here who can suggest what could be the issue .Recently changed to gas heating and have a viessmann vitoden 100 , 26 kw condensing boiler .The old oil boiler was a firebird 26 Kw and I have almost already started missing it . The house is well insulated and...
  2. A

    Switched live on Viessmann vitodens 100 boiler

    Hi all, I have installed Viessmann vitodense 100 combi boiler and about to connect to my wiring center, I could not find to which connector/port on the boiler should I wire switch live. Has anyone experience with this?
  3. N

    How to connect honeywell t5+ to viesmann vitodens 100 boiler.

    I have viessmann vitodens wb1b 100 boiler and im trying to install a honeywell t5+ wifi thermostat. I currently have a 2 wire thermostat with no c-wire. Can anyone help me with directions and or pictures?
  4. B

    Connect Viessmann boiler to honeywell smartfit

    Hello guys Just installed a Viessmann Vitodens 100w and am struggling with the wiring (honeywell smartfit controller). Viessmann say you can just connect the mains power to the boiler, which I've done, and it works. However, there is no pump overrun this way. As soon as demand goes off, the...
  5. S

    Viessmann 200-W Combi 35kw (New 2019 version) Installed - Advice?

    Evening All, Hoping some plumbing/heating engineers/other knowledgable folk on here might be able to assist with some questions about my new boiler. We had the new Viessmann 200-W 35kw Combi installed this week by a Viessmann registered local heating engineer. It's the new 2019 version with...
  6. A

    Looking for a Registered Gas Engineer to install a Viessmann Boiler SE London

    Hi, i’m looking to upgrade my heating system; i currently have an unvented system with a Potterton Boiler, cylinder in the airing cupboard (1st floor). what i want to do is change the boiler to a Viessmann in a new position - cupboard at the front of the property - see pics. Also i want the...
  7. C

    Viessmann Vitodens 200-W Problems

    I have two Vitodens 200-W system boilers connected via a low loss header. They are about 7 years old and have run perfectly since they were first installed until now. They were installed as part of a whole house re-plumb and have had Fernox MB-1 Heating Protector in the circuit since day one...
  8. J

    Viessmann Pressure gaining

    Hi, new to this forum. Wondering if anyone can shed any light. I have a Viessmann Vitodens 100-W WB1B 30kW Combi Boiler and it's been installed around 10 years so I know it's gradually on it's way out. I have had no real issues apart from having to have a new pressure vessel fitted 3 years...
  9. P

    Viessmann multiple zones

    I know that through opentherm thermostats it is possible to control Vitodense 100-w DHW. But in case you use a simple thermostat there is no way to turn it off remotely. In case of having multiple zones I can't find a way to control dhw since only one opentherm thermostat can be connected. Is...
  10. F

    Viessmann Vitodens. Hot weather, no hot water

    We had this problem for a few days last year, but has appeared again. During these warmer temperatures that we are currently experiencing our boiler stops heating the hot water. Upto a couple of days ago when it was cooler it was working fine, and if as last year as soon as it cools off again...
  11. G

    Viessmann 111W storage combi "Crinkly/corroding hoses" Your advise/experience

    Hi I'm new on this forum so my apology if this is not the correct etiquette. Earlier I thought I was posting this question on a forum but think I actually "started a conversation" with Scott) I am looking for advice on Viessman 111W corroding hoses. Background: I currently have a 19 year old...
  12. A

    Viessmann Viterol 100 RF2

    Hello, I'm trying to replace a conventional Drayton central heating programmer with the above Viessmann wireless programmer, in my Viessmann 100W system boiler. I have a Y plan setup, and am unsure how I can get the programmer to output to the 3 port valve to call for CH or DHW. Does anyone...
  13. J

    Tado Viessmann Update - Best Result?

    I though I would share with you my experiences. Vitodens 200w System boiler and Tado V3+ Boiler fitted by engineer selected from Viessmann Website (Viessman advise they have no control over fitters). Complete car crash, tried to fit two pipe system to four pipe boiler, on site six times to fit...
  14. C

    Viessmann boiler some advice required

    We have just moved house and the boiler is a Vitodens 222-F with Vitotronic 200 control unit with weather compensation. I understand that the heating will come on at times even though the programmer is not calling for heat. But I am not happy with this. For example the stat is set at 19deg, sun...
  15. 3

    Viessmann 200-W menus

    Viessmann boiler control has two levels of parameters that can be set, level 1 and level 2, but level 2 seems to be almost identical to level 1. What is the purpose of the level2 control options?
  16. B

    Water heater leak, is piping wrong?

    Hello, I'm a renter of an apartment with a Viessmann Vitodens 222-w heater. I came back from a 1 week trip and my heater leaked into the ceiling of the apartment below me! I don't know what happened, but after some research, I suspect the heater wasn't installed correctly. Here is a...
  17. 3

    Height of a Viessmann boiler

    I’m about to hang a new Viessmann boiler prior to the commissioning and notice the guide says it must be a maximum of 1925mm from floor if the DHW cylinder is below it. I would like to position it 100mm higher than this but don’t want to do so blindly so what is the reason for the height...
  18. R

    Underfloor heating + Viessmann 222F

    hi all, Just purchased a property and looking at boilers etc. We’re going to have all of downstairs with underfloor heating (approx: 100 sq meters.) running backup rad pipes also downstairs (just in case!) 4 beds, will have an en-suite bedroom in the loft and also mid level bathroom. Rads in...
  19. B

    Best Smart Thermostat System For Viessmann 222-F Boiler?

    Hi All, I have just got a new new Viessmann 222-F Boiler & need to decide which Smart Thermostat System to get for it - I am a novice & know nothing about these things and the choices out there are very many! My installer said he can install most of them but with certain models extra equipment...
  20. fronty

    Viessmann boiler set at max just to get enough heat

    Just had a new Viessmann Vitoden 100w heat only boiler installed, I have to turn the dial all the way to max just to get some decent heat, if I turn it all the way (so it's pointing at reset) it'll settle at around 76 degrees. Is this normal? It's modulating fine, I was maybe expecting to set...