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Could anyone please explain whether one of these systems is better than the other? Sealed system, heat only boiler, pump on flow, just after boiler, expansion vessel on inlet side of pump. or Same as above, but pump on return, just before boiler, and expansion vessel on inlet side of...

Could anyone help me with information regarding the amount of heat pipes can carry? Searching through previous posts and the internet, there seems to be a bit of variation. The situation is a 4 storey house. Boiler in basement. Completely new central heating pipes. 2 zones. Basement and...

Could anyone tell me, please, what extra controls would be needed to install a wood burning stove with flow and return to an unvented cylinder. I realise that the normal situation is for a gravity system, but I wondered whether it was possible, and had anyone done it? How would you 'turn off'...

I need to join a new 22mm copper pipe to an incoming main which has got written on it - Qualplast 1972 1/2". It is a black plastic pipe. The o.d of the pipe is just under an inch. This implies a fairly large wall thickness, assuming the internal diameter is 1/2". Have I got this right...