The Efficient Home Forum

hey all,
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 controller
HR92 Radiator controllers
Relay box

I needed to change the boiler however, so had a new Viessmann Vitodens 222-F B2TF 32KW installed.
https://www.viessmann.co.uk/en/products ... 222-f.html

Am i correct in thinking this IS opentherm? so it should work with my honeywell setup?
i do see it mentioned here: https://viessmanndirect.co.uk/files//16 ... ctions.PDF

Currently they dont all talk and so its a nightmare trying to set the boiler to a temp and then have it work with the rads, as the outdoor temp and the whole heating curve things play havoc with it all!

im getting various errors, such as Viessman dhw heating flow rate not reached and high-limit safety cut out

No, the Viessmann 200 Series is not an OpenTherm boiler. This is also not the best way to run this boiler.

The EVOHOME Shop wrote:No, the Viessmann 200 Series is not an OpenTherm boiler. This is also not the best way to run this boiler.

thanks
whats the best way to run this, with evohome?

Personally with evohome, would have gone down the 100 series route. 200 series is a much more specialist boiler for use with Viessmann's own controls.

Ok!
I have the boiler now I’m afraid, so can’t go to the 100

Anything else that can be done?

I don't have enough experience with the 200 series to advise sorry.