In case anyone reads old threads, it seems there are now 2 solutions to trigger the boiler heat demand.
One is to create 2 flows for each radiator. One that switches a relay connected to the boiler demand, when the temperature falls below the radiator set temperature (and the other flow the reverse).
The other solution would be to use the VThermo app, which is supposed to achieve the same without needing flows. For this, you would need to create a virtual VThermo and make sure relay is designated in it’s settings as a heater, and in the same Homey Zone as the VThermo and thermostat (e.g. Popp TRV or Aeotec multisensor).
