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The Viessmann Group is a German manufacturer of heating, industrial, and refrigeration systems headquartered in Allendorf (Eder), Germany. With 23 production companies in 12 countries, distribution companies and representative offices in 74 countries and 120 sales offices throughout the world, Viessmann is international in its orientation. 55 percent of turnover is generated abroad. Since January 2018, the company is led by Martin Vießmann (Chairman of the Executive Board), Maximilian Viessmann (Co-CEO) and Joachim Janssen (Co-CEO).The company was founded in Hof an der Saale in 1917 by Johann Viessmann, and has been family owned for four generations. As of 2019, the company employs 12,300 people and reports annual sales of € 2.65 billion.

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  1. I

    Viessmann 100-W System With Evohome

    Morning, I have a job later this week with the above , Viessmann Vitodens System boiler. It has a 4 pipe setup with internal diverter and at present there is a wireless thermostat/programmer controller in the hallway. Customer wants a Honeywell Evohome System and I just wondered if I can wire...
  2. M

    Viessmann 200-w B2HA-35. CH flow pipe hot when only demand for DHW

    Hi, Hopefully someone can throw some light on if this is a real issue or not. I have had this boiler for about 10 years, I noticed just recently that when the CH has been turned off that a couple of the rads closest to the boiler were slightly warm. When the boiler had demand to heat the DHW I...
  3. D

    viessmann 050-w and viessmann generally

    hello! while saving up for a new plumbing and heating installation for my new one bedroom flat, i did a lot of research on different boilers and systems, sought some advice, and settled on a viessmann vitodens 050-w, seems to offer a lot in terms of features and reliability, offers good value...
  4. N

    Viessmann 100-w 30kw - Constant noflame @ start error (immed resolved)

    Have this boiler since last November and have given up on the installer and have another person coming this week. Supplier here in Ireland came out and said there was an issue with the flue install (it's in the attic and exits through the roof close to the chimney). Old installer who has done...
  5. Desktop987456

    Viessmann weather compensation sensor

    If anyone looking to sale a spare viessmann outdoor sensor (pic attached), let me know via PM. Thanks
  6. Desktop987456

    Viessmann 100-w WB1B 13kw

    Hello, I am about to get the attached Viessmann 100-w heat only boiler with pump and diverter valve. Current boiler - Non Condensing System - OV, CH only, no DHW Feeder Tank - Yes Expansion vessel - No Pressure Relief Valve - Yes Filter - No RF connections - 22mm NG pipe - 15mm from meter to...
  7. jakubjakub

    Unusual Viessmann 111w problem

    Hi, I have a problem with Viessmann 111w I have a Vicare sensor and app. It goes like this : If I have a boiler in DHW only everything works as it should, but then I switch it to DHW and heating. Temperature in a room is 21 degrees. I set the boiler to come on when the temperature is 17...
  8. jakubjakub

    Unusual Viessmann 111w problem

    Hi, I have a problem with Viessmann 111w I have a Vicare sensor and app. It goes like this : If I have a boiler in DHW only everything works as it should, but then I switch it to DHW and heating. Temperature in a room is 21 degrees. I set the boiler to come on when the temperature is 17...
  9. F

    Outdoor vs Indoor thermostat

    Hi All, Is there a way of connecting an indoor thermostat to a Viessman Vitodens 300? What thermostat is recommended? So, my home is in Sweden, and the plumber installed a standard outdoor thermometer to regulate the output of the boiler. This involves having a thermometer installed on the...
  10. M

    Viessmann Vitodens 222-F: short cycling on hot water call

    I have a Viessmann Vitodens 222-F FS2B 26kW Storage Gas Boiler installed in 2014. The boiler has developed a problem recently where it short cycles but only when hot water is used. When hot water is turned on (on any tap in the property) the boiler remains off for about 45 sec. At the...
  11. L

    Outside temperature sensor - weather compensation. Viessmann

    Morning all Viessmann Vitodens 200-W 35kW combi Outside temp sensor probably failed with boiler reporting incorrect temps. Corrosion on Thermistor. To replace the sensor, does it have to be the exact model showing on the manufacturer’s website, or would a slightly older (but same spec) sensor -...
  12. S

    Viessmann Vitoden 200-W vs Worcester 36CDI

    Looking for a bit of advice on which one of these two to get, or any other similar suggestions? Just moved into an old Victorian property and we are replacing the boiler. Considering efficiency and reliability which one should I go for? Many thanks
  13. M

    Viessmann 100-W Heat Only and Weather Compensation

    We are a few months into our Viessmann Vitodens 100-W 19KW Heat Only boiler and it is working fine. We replaced an old 1999 Baxi. Our house is a 2 bathroom 4 bed detatched, built 1999. The engineer did not really know the Viessmann boiler and I am not convinced his approach of “turn everything...
  14. JamieP83

    Honeywell Evohome Viessmann Vitodens 222-F -- help

    hey all, Based in South England, UK. Hope this is the correct place to ask and that ive added all the required info/images. I had an old boiler that was setup with my evohome system, 12 zones in my house, with controls on each radiator - all worked well. Honeywell THR99C3112 Evotouch...
  15. K

    Viessmann Vitodens 200-W B2HA heating issue

    Hello! I have a large house, 20 radiators + UFH. Heated house area is about 350 m2. House is class B, it is written in the certificate that house requires 73 kWh(m2/year) for heating. I had my system fully upgraded last year, installed new Vitodens 200-W 49 kW (B2HA) model with Vitotronic 200...
  16. A

    Viessmann vitodens 50 hot water issue

    Hi. I have a viesmanm vitodens 50 but I've noticed it's behavior change recently I think. When running a bath for example, the boiler will fire up and start providing hot water as expected. The temp on the boiler display climbs steadily to about 85 degrees with the burner indicator showing 5...
  17. P

    Viessmann Vitodens 100-w configuration with Nest

    Hi all, I had a new Viessmann Vitodens 100-w boiler (the new version) installed last year. The guy who was installing and commissioning it had never seen or commissioned this boiler before, so I guess he didn't do it in the most efficient way: 1. I've got Google Nest thermostat but it looks to...
  18. P

    maximum heating ouput on a viessmann

    Does anyone know what this parameter on the newer viessmann 100-w (B1KF) range does ?
  19. grumpydad

    £190 for extra 2 years warranty worth it? Viessmann

    Just about to order a Viessmann 100w. Comes with 10 year warranty. Or £190 extra for 12 years. The company I am going to use boiler hut, offer a Viessmann service for £100, I was going to skip the 2 year extra warranty, and put the money to getting Viessmann annual services. For example...
  20. S

    Viessmann Radiator Thermostats

    I was curious as I saw these that work with the entire Viessmann control centre and wondered if anyone has installed them. They come in various packs of single, 2, 4, 6 stats. They connect to the ViCare app and control, not sure what they do and how you control them. Or how they play if you...
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