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Not sure whether to be concerned about this or not?
Our neighbours boiler is making odd burping noises from either the exit flue pipe or the water pressure override pipe thing.
It starts quietly and grows to a very deep base rumbling sound before what seams like pressure is released.
It's getting louder and more frequent.
They do no maintenance of their property and I'm just a bit concerned of something going bang in a big way.
What could it be and is it dangerous?
Ta
erm. Ours does this. I don't know how bad it sounds compared to your neighbours (pretty sure I'm not them).
It's on my list of things I'm considering being concerned about, so I await replies with interest.
Pressure relief valve blowing off?
Kettling?
If too much lime scale builds up it starts to boil, which in a sealed system will cause the pressure release valve to release.
Our does this, but it's an open system. Descaling the heat exchanger is such a messy job I only do it once every 10 years or so.....
Well this isn't the thread I thought it might be
They have a standard combi boiler, and not in an area that suffers from lime scale.
Gas valve is stuck open and it's boiling without the pump running?
If it's more of a bubbling noise, it's likely that that the waste water pipe is blocked. The effect is that the hot gas has to bubble through some water before getting out. Easy fix, especially if it's plumbed in by the u-bend which they often are.
Our boiler occasionally does this as well, I'm led to believe it's either the mixture being a bit off or a resonance building up through the soil stack when the condensate purges.
Our plumber didn't seem massively concerned when I phoned him and said he'd sort it when he does a service in a couple of months.
Ours is more of a roar that builds up than a pressure, boiling, escaping steam kind of noise though
Is it making a kind of 'howling' noise, as per [b]MikeG[/b] above? If so, suggest they get it serviced.