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Thanks Lumat, I have already tried to balance system, all rads have been shut off (except one) the last three have been left fully on (all three in the same room in a seperate building) and they have become very hot. I then moved down through the system proportinally opening the return valves...

I have recently fitted a new electric "s" plan system to my old central heating pipework. I originally had an oil fired boiler on one side of the house with an emersion heater the other side of the house. The oil fired boiler has now gone with plumbing altered accordingly. The emersion heater...