I have a heat pump with underfloor heating on the ground floor and radiators on the first floor.
The system is currently controlled by a Heatmiser system. The ground floor is split into 4 underfloor zones controlled by an individual temperature stat for each zone. the radiators upstairs are controlled via a single temperature stat connected to a dedicated radiator zone on the Heatmiser unit.
I am going to replace the upstairs zone with the evohome system. I have only recently become aware of the two different relays (BDR91A and BDR91T). I have the BDR91A 2021 model. I understand that the BDR91T is designed for heat pumps but I am struggling to understand the difference between the two. I plan to use the relay to supply a signal to the Heatmiser unit which will signal the heat pump. Am I ok to use the BDR91A relay? I have read on some sites that the BDR91A 2021 model is compatible with Heat Pumps, is this accurate? Do I need to adjust the settings on the evohome to support this function?
Appreciate any help on this
