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hot watrer goes cold?

I have hot water for about 30/40 seconds then it cuts out and runs cold, then fires up again to hot , this keeps repeating (pain when having a shower dont know if its hot or cold ) can anyone advise thanks

dave w
November 2009
Heating, Home Heating SystemsHot Water Heating Shower
depends on what model boiler.. sounds like plate to plate heat exchanger blocked up....this can be removed and cleaned or replaced...

darren ( gascare ) s-o-t
November 2009

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Hot Water Keeps Going Cold - Help!