Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Viessmann comparison

I have a job coming up that has 1,200 square feet of radiant and a small DHW load. I have two Viessmann choices:

- Vitodens 222-F B2TB35 combi
- Vitodens 200-W B2HB-26 with a Combi PLUS DHW heat exchanger

Any preferences?
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour


  • Robert O'Brien
    Robert O'Brien Member Posts: 3,463
    edited May 2017
    To the best of my knowledge, the combi plus is only compatible with the existing
    100 series. The combi plus add on is being phased out in favor of an all in one case design.
    To learn more about this professional, click here to visit their ad in Find A Contractor.
  • Paul Pollets
    Paul Pollets Member Posts: 3,547
    the 222f is an excellent choice.
  • Thanks, guys. I suppose with the 25 gallon tank, the 222-F would reduce short cycling.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
  • Fredm
    Fredm Member Posts: 4
    I've done a few 222-F boilers now. They have become my go to whenever possible. Indeed they do not short cycle. On small heating systems I use a Low Loss Header for the obvious benefit.