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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...

Not quite. This is Ireland we are talking about. Although only one mains feed into the fcu, it has been used as a junction box to run another circuit off :-)

I only have one heater,but it is marked 'dual element' During the summer I would need to have both working. I have an oil fired Stanley range which has no option on it to heat the water in the tank without heating the radiators.

The fcu has 'sink' and 'bath' options, and 2 separate live out terminals.

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...