The current heating and water system is a Honeywell S plan controlled by a 2 channel British GAS UP1 (currently no room stat) which needs replacing. The information on the Honeywell site would lead me to buying an ST9400C (2 channel programmer) and a CM907 programmable thermostat.
Is it a straightforward swap from the UP1 to the ST9400C? i.e re-wire directly to the wiring centre? Do I really need a 2 channel programmer if I have a programmable thermostat? What settings do you apply to the 2nd channel (heating).
thanks in advance.
Is it a straightforward swap from the UP1 to the ST9400C? i.e re-wire directly to the wiring centre? Do I really need a 2 channel programmer if I have a programmable thermostat? What settings do you apply to the 2nd channel (heating).
thanks in advance.