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There is definately a pump. We have turned the pump down to number 1 setting but the sound of water gushing through the pipe works and the overflow pipe hurtling hot water out of the house made us turn the heating off again. Some of the radiators are now cold and some hot. It's a day mare and...

Hot water is definately coming back through the feed and expansion pipe into the expansion tank. Having read some of the information as you advised it seems I have a 'seesawing' problem. Would this be correct??? Many thanks

My Father-in-Law has a gravity heating system which also works the DHW. On the boiler there is an option to work just the water or the water and heating together but not just the heating alone. When the heating is on the hot water cistern seems to 'over cook' and then hot water feeds back into...