URGENT problem, if you are able to suggest a solution to me. Many
Reputable central heating installer.
Complete new central heating system, boiler/pipes/radiators.
Combination condensing gas boiler, sealed system.
Standard Copper pipes (25mm).
Radiator thermostat valves.
The whole system recently installed totally new.
There is a steady, continuous, build up of hydrogen gas in the
system, which results in a steady rise in system pressure as
shown by the boiler gauge (about 0.1 bar every 2 days).
What is causing this steady, persistent build up of hydrogen gas
in this completely new system?!!
The sound of small gas bubbles is clearly heard in ONLY ONE
radiator valve (noise stops when this valve is closed), however,
the gas build up still continues.
System has been drained three times so far, also 2 times
inhibitor strength in the system.
Boiler's fresh water inlet valve was changed, just in case it was
letting fresh water into system from the mains.
First gas investigation -> gas from a radiator burnt strongly ->
ie hydrogen gas.
Is it possible for air to get into system - even though system is
After 3 times draining the system over 2 months, residue FLUX
cannot be causing this problem!
Is one radiator valve causing this due to oil leakage of some
sort? I'm just guessing.
Is this caused by the boiler?
Is something leaking into the system? oil/grease/flux/air/fresh
water/metal powder? . . .
Is something corroding?
Out of frustration, I am about to ask the installers to take the
whole system down!
Based on your experience, what is the most likely cause of this