The Efficient Home Forum

Just a slight follow up: Atag support have confirmed that if the Honeywell OpenTherm bridge provides a DHW demand command (as opposed to a CH demand), then the boiler will fulfill that DHW command, raising the flow temperature and controlling the 3-port valve. My only unknowns are: 1) Whether the ...

Hi, I recently upgraded the CH controls on my system to Evohome, using an OpenTherm bridge to control my Atag A200 system boiler. As I wasn't sure the Opentherm would work (it's not offically suported by Atag on the A series), I have temporarily manually locked open the CH 2-port valve and ...