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Thanks Tony. The plot thickens. One pump appears redundant (i.e. never kicks in) and the other pump is for the CH and it must also be for the HW as that is working? The two pumps were always in place. There is a thermostat dial on the cylinder but it appears fine. The one pump continues...

I have a Baxi boiler supplying a stored vented hot water system (hope that helps). One of the two pumps does not switch off after the boiler shuts down. Also this pump is noisy and rattles. Can anyone offer any advice on both these problems. Also, does anyone know why the system has...