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I am planning to change my gravity hot water to pumped and i also need to change my hot water cylinder. Because stainless cylinders normally have 22mm welded compression joints would it be ok to reduce from the existing 28mm to 22mm and then back to 28mm on the return.This way i can keep the...

I have just noticed a leak in my cylinder which is gravity and was thinking i may as well go fully pumped while I'm replacing the cylinder. I am a controls electrician so the electrics are ok but i need some advice on the pipework. I have attached a sketch of my system. My pump seems to be...