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Question:

why is our boiler is making a bubbling sound?

why is our boiler is making a bubbling sound?

Answer:

The air and water in your system need to be balanced. If you don't know how to do this(Bleed the system!) you need to call a service man.
overheating beware,they can explode ,
It is overheating. This may mean that the thermostat needs to be re calibrated down to a lower setting or replaced.
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