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I want to replace the existing old Satchwell room stat with a new digital. The Horstman is a 2 wire set-up according to all I have read but the existing Satchwell is a three wire excluding earth. C/H boiler is an old Gloworm gas floor mounted on a 2 pump system, 1 C/H 1 H/W. Programmer on...

We have bought a house which has a 2/3 year old ‘new’ GE consumer unit. It has either an 80A or a 100A DP main switch protecting the off-peak supplies, which are 3 x1.7KW storage heaters and 2 x.85 storage heaters plus an off peak immersor for a hot water cylinder and all 5 are all on...