The Efficient Home Forum

Cheers - I am stuck with the boiler until it's not economical to repair, so at present I'm trying/testing/using their weather compensation kit for Vitodens 1XX series boilers as a potential solution (the objective being reducing gas usage, therefore saving money ongoing and just as importantly to me ...

Hi Both Viessmann and Honeywell have been actively (and in the case of Honeywell extensively) involved and confirmed the behavior is as described. Honeywell provided modified (diagnostics,logging and telemetry based and focused) firmware on my Evohome controller to see what was happening and to try ...

Just to update this thread for others, I have a very similar setup and basically have had to revert back to BDR91 Relay control. Viessmann for some reason have locked out max ch flow tempmcontrol on the boiler as they expect the controller to configure this setting. As the previous poster stated ...