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Ta.

Thanks ReJect and I accept your points. With regards to the solid boiler, other than cleaning what you might call the "injector tee" that boiler's circuit has not been fiddled with and now seems to be working correctly. If I understand your safety concern correctly (pressure build up) this...

A friend recently started to have problems with his central heating system (CHS). There are two boilers, being an oil fired boiler and pump (P2) in an outhouse and a back boiler around the living room fire. There is a second pump (P1)which is in the Airing Cupboard. Each pump has its own...