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Hi Having read all the previous posts on this subject, what are the consequences of adding 3 radiators to a 7 radiator system by teeing off the pipes going into existing radiators. The boiler will run 12, but the problem I have is that all the flow / return pipes are buried underneath concrete...

Hi. Can anyone help me please? I have bought a timer to control my immersion heater, and assume that it should be connected between the heater and the fcu. The timer has L N in and out, and a common earth which suggests installation should be easy, but the exiting outlet from the fcu to the...