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Update: It's not at all obvious where the f&r pipes enter the concrete - no obvious boxes, not obviously in a cupboard. I do have the invoice from the builder of this extension, so there's an outside chance they'll have records - it was done in '06. It does seem an awfully short period of...

Interesting suggestion. I haven't seen the pipe work going into the concrete floor, but it must do somehow. I'll have a look when I get home. There are only two rads fed by buried pipes. Surface drops would be infinitely preferable to digging up the floor. But to make that happen I have to find...

Yep - that all makes sense. I'll get the plumber to isolate the cylinder as you suggest; and go from there. Cheers

Thanks very much. I don't know if the old system was open vent or not, but there is a mix of rads (there have been three separate extensions over the years). Some of the rads are pretty old for sure. I was aware of the issue of sludge build-up so had the whole system power flushed when the two...

Cheers. There is mains cold to kitchen and also to a ground floor (f)utility room as well as to two outside taps. Bathroom is on the first floor and cold is tank fed. Yes, I guess there is a rad at 7m from ground level - but the pressure gauge itself is at 5m - wouldn't the differential only...

....if they can help with the following issue. I have a big problem with my CH system losing pressure and gaining air, and it's driving me nuts and, tbh, the plumber I'm using is now looking to me for suggestions as to how to fix it and I'm out of Google-based solutions. Background: I have a...