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Mend Heating System Central Overflow

hot water coming from overflow pipes when radiators are switched on, why?

whenever I want to dry our wet clothes, and we switch on the radiators, hot water starts to overflow from the overflow pipes. This does not happen with normal heating of the house. can you tell me why?

thomson
April 2010
Heating, Home Heating SystemsHeating System Central Heating Overflow

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Radiator Overflow: Why is Water Leaking?