"Brian Gaff" wrote in message
...
Also is there any way to isolate a zone?

I rremember in a friends house about ten years ago, I walked into an
upstairs room and said, it smells like fresh plumbing in here. IE I cannot
describe it, but there is a smell of dampness and something like a coppery
tinge to it.
There was a tiny pinhole in a pipe to the radiator there. It semmed to be
almost like steam. Weird, as I do not see how one can get a pin hole in a
pipe.

There was a rash of that with copper pipe in the early 70s, the way it was
manufactured.

Still that sort of problem has always put me off of central heating

Yeah, I prefer air systems rather than water.

"Paul Welsh" wrote in message
...
On 09/03/2019 18:25, John Rumm wrote:

Any bright ideas?


I cut strips of kitchen paper and tie it around every possible leaking
joint.

I live in a hard water area so even if the water evaporates I get calcium
deposits after a few weeks or months, these can be felt by the paper
going slightly hard and discoloured.

Two litres sounds a lot. How do you measure it?