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That's the one..here's a pic. Learn something new everyday!

Solved the problem in the end. I had a look at the old cylinder last night and you are right, strange coil inside so must be one for gravity. I do believe it was the original one. Going back with a fresh mind today I noticed the vent pipe was a little low, the top only 25-30 cms above water...

I dont think so, there is a check valve on the flow and is going the right way. To describe the system (HW side) a little more. I suspect there was an old floor standing boiler, ideal Mexico or such, in the garage that was probably one of those that used convection, then pump only fired for...

Hi, I just put an indirect cylinder in for someone, simple one in one out..or so I thought. When I fire up heating and hot water all is well, when hot water only is selected, the water from the boiler spills over into to f and E tank in the loft. I've tried turning the pump down but it still...