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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 Cold Seconds
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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