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Thanks Tony, so when the central heating thermostats kicks and fires up the boiler, then any hot water that may be coming from a tap will turn cold as the hot water is diverted to the radiators, is that what you're saying?

All I know is it' a Valliant Combi installed around 2001.....

Hi, I have an intermittent issue where the hot water to the taps and shower from our combi boiler sometimes decides to run cold. The pressure to the taps has always been low, as it takes ages to run a bath even when the water is coming through hot. Having investigated I think the problem only...