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Potterton Performa 24. I have to put the heating on to get hot water ?

I can only get hot water if the heating is on. What has gone wrong. Scare of the cost. What part need replacing?
Zoe, July 2010
split hw diaphragm, about 50 pounds for part and labour

uneverknow, July 2010
Diverter valve diaphragm is most likely.
Other possible is blockage in the HW inlet filter

Carefree, July 2010
link Click here to see other fixes for Potterton.