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I presently have a Keston C55 boiler which is an absolute dog. It needs to be replaced and I am looking at one of the following: Vaillant ecoTEC 65 Wall Hung Gas Regular Commercial Boiler (65Kw) Potterton Gold High output 65KW 220 Btu Boiler Std horizontal flue Worcester GB162...

I am presently in Italy and I am trying to install a Honeywell CM907 thermostat to replace an existing thermostat on teh central heating system. I have removed the cover of the old thermostat and there are 3 wires, brown, blue and grey. Can anyone advise me in what order I connect these to...

I am presently in Italy and I am trying to install a CM907 to replace an existing thermostat. I have removed the cover of the old thermostat and there are 3 wires, brown, blue and grey. Can anyone advise me in what order I connect these to the A,B & C terminals on the CM907. The boiler is a...