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Mend Boiler Temperature Control Heating System

why does the hot water only work when the central heating is turned on?

Why does the hot water only work when the central heating is turned on.The central heating summer/winter switch is on water and heating at the boiler but as soon as the heating is turned off on the dial in the house the water is cold.

paul
February 2010
Heating, Home Heating SystemsBoiler Temperature Control Heating System
what make of boiler!

blackfish
February 2010

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Hot Water Only Works With Heating On - Why?