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I'll certainly try to locate the leak, if indeed there is one. Would it also be worth adding a new dose of inhibitor to mitigate any issues with dilution?

Thanks everyone. Given the system does need a small top up every few weeks, I imagine there is a small leak somewhere. But sounds like not enough to worry about - although I will keep checking. I'll try not to worry, but when water's involved I always tend to!

That one radiator seems to be the only one that needs to be bled regularly. Definitely a bit of air bubbling up into that one when taps are turned on/off, even when heating is off (e.g. late evening when heating has been off for over an hour). So is it possible that some air enters when the...

No, nothing substantial in term of pressure drop

I also have an issue with dampness under a wooden block floor. We live in a low lying area that floods on occasion, so I have put that down to rising damp rather than a leak. It could of course be linked to the heating system issue, but I am reasonably confident that no cental heating pipes run...

Once I've rechecked and tightened all connections, I assume my next step is to bring in the experts?

Thanks. The radiator in question is relatively new, so do you think a pipework leak (or perhaps issues in the boiler itself) is most likely? I will recheck all visible pipework. There is some green staining around some connections, which I assume means a small leak (either current or historic)...

The radiator heats pretty well. I am venting it every few days, but only a small amount of air. I'm not sure re the filling loop (apologies, I am definitely a plumbing novice!). The filling key (if that's the right term) has been stuck in place for years.

I haven't found a cure yet. Boiler has just been serviced, and all seems OK on that side. I'm checking the entire system for leaks. Fearing that perhaps there is a problem somewhere not easily accessible...

That's a good thought, thank you.

Hello, A slightly strange one, that a heating engineer has yet to work out - hoping that someone could offer some guidance! I have a combi boiler, located downstairs in the kitchen. Whenever certain taps (esp downstairs cloakroom) are used, air bubbles up into the radiator in our attic...

Hi all, I need to remove an old radiator from an attic room (it is, as you'd expect, the uppermost rad in the house). The rad will be binned, to be replaced by new ones in diff locations in the room. I want to be able to remove the rad and cut the pipes back (rad is on a stud wall with...