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please advise if anyone knows the manufacturer of the hw plate heat exchanger. I am told they should be around £50 and potterton charge £180?? Many Thanks.

I have a three year old unit. the hot water has decided to cycle, by this i mean goes hot and then cold. the hot improves if i reduce the flow. The same problem occorred 1 year ago. I had a new plate heat exchanger and a water softener fitted (looks as though the softener does not work)...