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I have had an overflowing CH expansion tank ever since I moved the central heating pump from the return side to the flow side. I have a Danesmoor 15/19 CF utility oil boiler. It is an open vent gravity fed hot water system with a pumped CH circuit. I have four pipes (excluding the oil supply...

Here's my setup. 1 - Live in a bungalow, all radiators are ground level. 2 - I Have an open feed gravity fed Hot Water system, pumped CH system. 3 - CH pump was in the loft on the return side of radiators. 4 - One of the radiators was connected to the return feed from the gravity fed side...