I have a rather old Stelrad Ideal Mexico Gas Boiler. Gravity fed HW and pumped CH. TRV on all rads except Towel Rail. Timer is also old electromechanical model.
I would like to add a Honeywell CM927 wireless programmable thermostat to the existing boiler.
Should the CM927 unit be wired to control the circulation pump or the burner? - or both?
Any advice much appreciated.
I would like to add a Honeywell CM927 wireless programmable thermostat to the existing boiler.
Should the CM927 unit be wired to control the circulation pump or the burner? - or both?
Any advice much appreciated.