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1 Header tank for the hot water 2 Expansion tank for the Central heating 3 Air separator (if fitted) 4 Pump 5 Motorised valve 6 Indirect Cylinder 7 Boiler 8 & 9 Heating Flow & Return Except it hasn't got an air separator

Further info: It is a Y open vented system.

Don't all rush at once!

Boiler: Baxi WM51/3RS Pump: 1 Grundfos pump Separate Sunvic control panel and thermostat. There is a motorised Sunvic Unishare valve which diverts the flow of water to either water or heating systems (or both).

Hi all. Hope you can help. I have an open system with a top-up tank in the loft. Every hour or so when the heating/water is on there is a surge and loud banging. Hot water surges up the overflow into the top-up tank and splashes everywhere. I have tried slowing down the pump and also...