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Thanks Mick - very helpful, I've been considering and agree I don't think it's anything to do with the boiler as the hot tap for the bath (shower is within the bath and not a power shower) works fine - and heats almost immediately.

Hi all, Wonder if anyone can help, We have a Potterton netaheat electronic boiler and randall 922 control panel (airing cupboard, cold water tank etc) approx 15 years old. Just recently we've lost all pressure in the shower, and it takes a good 5 - 10 mins to heat up, and even then...