Recent content by MikeToll

Thank you for the extensive post - that's exactly the big picture I'd not been grasping and great to have that (obvious to many no doubt) way of narrowing down the problem. I think I've got a reasonable feel for where the various pipes go - especially the heating as I did some thermal imaging a...

Sorry about the pause but thank you for the discussion ... which I can just about follow but I'm not experienced or knowledgeable enough (yet) to hold it all in my head long enough to arrive at an outcome! 1. I love the simple science of the drain dye / fragrance approach. So if I added drain...

Ooh interesting thank you - that'd be a sneaky leak, tho' the drain dye technique and a month or more of fluorescent yellow baths might incur the wrath of Mrs Toll.

Good case study - well found and well fettled. I'll take those 2 nuggets of learning and apply them - many thanks

Yes that's part of my monthly checks when I do the meter readings ... I've had 2 such leaks in the past so I've learned the lesson! Yes outside tap is protected and no other pipework is external ... apart from loft overflow ends. No, no recent DIY ... and I've not put a drill through a cold...

Is it possible to track down a "half litre an hour" leak with a stethoscope or other listening device or would the leak be just too quiet to find that way?

There are isolation valves - they're mainly close to their outlets and visible-to-the-outlet so I can see no leak beyond those, but I'll check for ones that might be used to diagnose further - good thought - thank you. The boiler has a F&E tank so I'm assuming that makes it an unpressurised one.

The mind boggles but no, none of those

I noticed my monthly meter reading had gone up a bit so I’ve been taking more frequent readings and found the house is using half a litre of water an hour when the house is dormant with no known or intentional water usage. There are no taps dripping (incl the outside tap), the 2 loft cisterns...