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Hi, I'm looking to swap my room thermostat for a new programmable one. Mine is a three wire (no earth), one I'm looking at is a two wire type, will it matter, whats the extra wire for? Regards, Jon

Hi, I want to move a radiator a few inches along a wall. My house is fitted with a sealed system. Do I have to drain the entire system or can turn all the valves off on the boiler & radiators and just drain whatever water comes out when I disconnect the rad? Thanks in advance, Jon