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hot water is intermitant, in and out in 20second gaps?

My hot water on the taps is in and out every 20seconds. this seems to be a blocked heat exchanger. How much roughly is it going to cost for the heatexchanger to be removed and cleaned.

Shirley Jeyarajah
October 2009
Heating, Home Heating SystemsWater Blocked Exchanger
depends on boiler make / model

Ian
October 2009

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