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I need to fit a filling loop and pressure gauge without an expansion vessel, as I already have one in the loft so I want to be able to monitor pressure/fill up without going up there every time. So, the filling loop is straightforward to fit, but its the pressure gauge I need help with...

I have a sealed c/h system with a Worcester Bosch Greenstar 24Ri boiler. But I lose all pressure every day, yes within 24 hrs or probably abour 5 hrs of heating and 1.5 hrs of hot water!! Cant find a leak anywhere, and can see about 90% of all pipework. Expansion vessel pressure is good...

1st post, so please bear with me... In the middle (ish) of converting 3 rooms into one large kitchen diner. Had walls taken out, doing the rest myself. I've had to make 2 channels in the concrete/screed floor to run rad pipes. This has left me with the channels to fill, both about 3.5...