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Mend Heating Hot Water Boiler

hot water goes cold then hot !?

When running a bath or having a shower the boiler runs then stops then runs on and off and the water cycles from hot to cold - could the problem be the exhaust fan ?

John Jennings
October 2012
Heating, Home Heating SystemsHeating Hot Water Boiler

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Boiler Cycling: Hot & Cold Water - Causes