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Cheers. Thank you everyone for your help. Managed to get enough hot water for a couple of showers. It does seem like there is something more sinister if we can't get the pressure to build up? Mght seek professional help tomorrow.

Thanks Dave, I have tried opening both of these valves with the heater boost on and off but the pressure does not rise more than 0.8 bar. We also have a valve at one end of the flexi pipe which I have tried opening and closing as well with no real effect. Not sure where to go from here...

We can not find any leaks inside nor is there evidence of leaks from the PRV vent outside. We have now run the heating on boost and the pressure builds up to about .8 bars. The heating is working fine when it is on boost and when we run the hot water the pressure falls back to .5 bar but...

Our Performa is about 3 years old and has suddenly lost pressure. There is no evidence of any leaks. Does anyone have any suggestions about how or why and if so how we can remedy?