Good afternoon all,

Apologies for going around the buoy again on an already discussed topic.

I have a Viessmann Vitodens 111-W boiler, Honeywell Evohome with BDR91 relay and HR91 TRVs. I work away from home and currently the only control that I have over the DHW is to turn it off at the boiler whenever Iím away.

I have the hot water kit but now have the issue that I think that I will need the OpenTherm Controller to be able to utilise this.

My future intention is to use OpenTherm but would prefer to not have to shell out post Christmas, is there a way to control the DHW without? I have read through the thread regarding 111-W overshoot and seen a number of recommendations to return to BDR91 but canít see where on the electrical connections it could/should go.

I will also be getting the OpenTherm Gateway to address the overshooting issue but again would prefer some time to raise funds.

Thank you in advance.