Your boiler runs hot water through a closed curly loop in your hot water tank. The loop transfers it's heat into the water in your tank. When you draw hot water from your hot tank ( via the top ) it's replaced by cold water in the bottom, so if you use too much hot in one go, you end up with cold, till the closed loop from your boiler can heat it again. Your boiler is just acting as a heating element. Unlike a combi boiler.
Last edited by: Zero on Wed 21 Sep 22 at 11:56
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