Ask a plumber/heating ‘engineer’ anything

[1TWS]

Saw the electrician one and I’m abit bored today so go ahead, other plumbers join in

[1TWS]

CharlesdeGaulle said:

I have to top up the water in my heating system from time to time, so where has the water gone? No sign of any leaks anywhere.

How often ? And what boiler is it?
It could be a faulty/undersized expansion vessel causing the pressure to rise and the pressure relief valve opening.
The boiler heat exchanger leaking and the water running down the condense.
A small leak which evaporates away and you not seeing it, look for staining one pipes/joints too.
Radiator valves are most common for leaks causing pressure loss, check trv valve bodies after taking the head off, Drayton trv4 valves leak a lot !
. Water doesn’t compress much, so depending on the size on the system to go from 0.1 bar to 1 bar doesn’t actually take much extra water.

Edited by 1TWS on Saturday 24th September 15:55