On 27/11/16 14:10, Phil L wrote:
mechanic wrote:
We have a problem with pressure loss in our central heating system.
Topping up each day and loosing 1bar or so in a matter of hours
shows something is wrong. Brit. Gas have said there must be a leak
and they've got to the stage of suggesting taking up flooring to
inspect pipes and junctions. This is getting expensive and
disruptive! BG have a £1000 limit on their part of repair and making
good costs. Have people tried:

http://www.adileakdetection.co.uk/le...tion-services/
http://www.leakdetectionspecialists....erty-leaks.htm
http://www.leakbusters.net/
(There are others)

Any experience with one of these companies? Pin-pointing the leak
position may save money in the long term, even though the survey
will cost a few hundred pounds. I've yet to explore the home
insurance angle to reclaim some costs.

If you can't see any damp patches or pools of water indoors, then the water
is going outside. If it needs topping up daily, you couldn't possibly have
missed an internal leak as it would amount to a small bucket full every day.
As others have said, the water is being expelled outdoors via the pressure
relief valve.....and I find it impossible to believe that BG didn't already
know this


When this happened to a mates boiler, it was simply the pressure vessel
needed pumping up.

WE would top up the CH primary, but as soon as it got hot it would blow
the pressure relief valve and dump water outside.

Pumping up the expansion thing with a car pump to around - cant remember
- look it up online - is simple and cheap and may fix the problem.

OTOH the boiler here, had to have a whole new expansion tank..


--
You can get much farther with a kind word and a gun than you can with a
kind word alone.

Al Capone