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Hi, Thanks for all the replies, ok some answers:- 1, Chemical used to flush the system was Sentinel XR400 Sludge Remover, was left in system for a number of weeks to get sediment to shift and be suspended in circuit water before finally being flushed out. 2. No the radiators have not been...

Hmm, dont think so....as the vent would run all the time in to the F&E tank even without the pump running and I would also expect to see the heating circuit water getting into the DHW (eg dirty water coming out of the taps) plus I would assume the F&E tank would be overflowing as the cold feed...

Hi, Moved into a property and noticed that the vent pipe from the CH circuit into the F&E tank in the loft is constantly running, even when the system starts up from cold. I have replaced the old F&E tank as the orginal had a missing lid and replaced the circulating pump, as the old one was a...