The Efficient Home Forum

I've decided to go with the Vitodens 111W.

I contacted technical support at Viessman about the problems I had heard with the Vitodens 111W and Opentherm with the following enquiry:
"Although the Vitodens 111W is Opentherm I have read that in Opentherm mode the boiler fixes the flow temp at ...

Thanks, I've spend some time slowly re-reading through that thread. I think the conclusion is unless Viessmann have changed their firmware in the latest models I'll have to go to Alpha or Intergas if I want the system to run efficiently.

David

The reason I've leaned towards the Vitodens 111-W is its hot water flow rate and in addition its modulation range. I have looked at Intergas and Alpha combi boilers but can't see they offer the hot water flow rate, certainly not that combined with the modulation range. However if using EvoHome with ...

Having spend hours trawling this forum I've learnt a huge amount (thanks to all) but I remain really confused about the situation with regards combining Evohome with Viessmann Vitodens combi boilers. Aspects of this topic have cropped up in a number of threads, most starting from a few years ago. I ...