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when the water heater is switched off why does it heat when the central hea?

when the water heater is switched off why does the water heat when my central heating is on. I have a Potterton boiler
Anne Stewart, February 2008
need more info their is millions of different potterton boilers

hi-spec plumbing & heating, February 2008
link Click here to see other fixes for Potterton.