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The hot water is heated directly when

The hot water is heated directly when you open any hot tap in the system this is achieved using a stainless steel direct heat exchanger with a massive capacity to transfer heat quickly from the boiler water (which no one would like to bath in!) to the clean, mains cold water that you want heated to come out of your taps some boilers do have a heat ‘store’ of hot water these vary in capacity but are never more that 15 litres.

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