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Spot on, that was the problem - diaphragm now replaced and hot showers once more!! Thanks again.

ok - thanks. I'll call a plumber but at least I can give an idea of the job that needs doing.

Thanks namsag - sounds like I should be able to do it myself. Are diaphrams standard sizes? How do I know which to buy as I'd rather do that before removing the old one to save being boilerless. Know of any drawings online?

I have a Brittony II wall mounted boiler for the hot water in my house. This was working fine until recently - now when a tap is turned on the water is either still cold or luke warm or sometimes hot. It often takes a number of attempts to get hot water. When I look at the flames through the...