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Potterton Puma 100 - slow hot water supply?

Have a Potterton Puma 100. central heating works fine but when drawing hot water it remains cold/cool until radiators have heated. If hot water drawn once central heating has been on, it is hot but if CH is off, hot water takes ages and not before radiators heat up too! Any suggestions?
Bluzzo, January 2010
It needs a new diverter valve.

Henry, January 2010
link Click here to see other fixes for Potterton Puma 100.