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tepid hot water?

linea 24, central htg ok, hot water from tap initially hot but then cools off and stays that way.
Engineer has changed primary thermister, no difference, he then suggests heat exchanger?
any advice welcomed.. thanks
kevin, December 2012
blocked heat exchanger would be a possibility if it starts hot then goes cooler

A1, December 2012
link Click here to see other fixes for Linea 24.