On Jun 14, 10:48 am, Jeff Wisnia wrote:
Edwin Pawlowski wrote:
"coustanis" wrote in message

I haven't rechecked that yet but I strongly feel that it won't. I
have thought all along that the leak is where the pipe is laid in the
concrete pad of the suspect room.
If the air pressure zeros out then I was right. If it holds then I
was wrong and the boiler pressure would drop.
There is definately a leak somewhere.
Just trying to pinpoint it's location.

What makes you think there is a leak? Do you see water?

Copper in concrete over many years can corrode and leak. Some older homes
with copper radiant heat had problems and the solution was to change over to
baseboard rather than tear up the slab.

At the risk of asking a really dumb question.....Is something akin to an
automotive cooling system "stop leak" product ever put into a hydronic
heating system to plug a small leak (maybe as just a stopgap "fix")
without screwing up something else in the system?

I thought about that because I know its not uncommon to use an
antifreeze mixture in hydronic heating systems at places like vacation
homes where the temperature may deliberately or accidentally get down to
freezing when the place is unoccupied.

I don't know if there is or not but I did think about that. Then I
decided that I should just fix it properly because I don't know how
long something like that would be effective.
I'd end up having to fix it sometime anyway.