I have a Glow Worm 30Si boiler and a Mega Flo unvented system. All seems to be ok generally with the water and the heating, but the boiler loses pressure over a few weeks and goes from about 1 bar to 0.5 bar.
There are no obvious leaks from the radiators or around the house. I have noticed there is some water, small amounts appearing on the floor underneath the mega flo, but I suspect this is the result of the pressure relief valve kicking in occasionally and releasing water, but the question is would this affect the pressure, or should I be looking for leaks in the piping system?
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