Within Domoticz if you check the values of the devices "DHW Valve" and "CH Valve", it appears to show you the aggregated heat demand of both. Based on that just simply change the Target Flow temperature with DHW Valve taking priority. I think this will give you a better Opentherm implementation especially if the boiler switch on is still being controlled by the BDR91 Boiler relay.
You don't need to bother about outside temperature actually. It's the temperature inside the house that is of more importance.
You don't need to bother about outside temperature actually. It's the temperature inside the house that is of more importance.
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