My hot water is heated by an immersion during the night on economy 7. Before I can run my hot taps in the morning, I have to run the power shower which expels air (noisily) and then and only then will my hot taps work. If the heater is switched off for the night, there is no airlock the next day. Obviously something is happening somewhere as the water is heated but could someone tell me how I might fix this really annoying problem please.
Many thanks in advance.