rumbling noise

Bob C.

I agree with steamhead it's probally sediment at the bottom of the boiler. This is a common problem with waterheaters but that doesn't mean it cant happen to a boiler. Sediment builds up and you get a krackling sound. what is happining is the sediment slows the heat transfer to the water causing the water at the bottom of the tank to boil.
Flush out the boiler but do it in a manner that will allow you to see what came out like draining it into a bucket or letting the hose run into a towell. You may find that you'lll need the use of a chemical(boiler cleaner) to break it up.

good luck,
Bob Cat

chuck_2

rumbling noise

I have a baseboard hot water loop heating system with three zones. A rumbling noise is heard through the system while the gas is heating the water. Replacing the pump did not correct the problem. When water is at temp, and gas shuts off, noise goes away. Placing ear to boiler indicates sound is coming from inside boiler. Could boiler be deteriorating on inside and something loose being moved by convectioon while gas is on, be causing the noise ? Happens no matter which zone is calling for heat. Sound can be heard through pipes anywhere in house. Heating system is manf. by HB Smith, installed 1987.

Steamhead

It's probably Dirt

in the bottom of the boiler. The rumbling is steam bubbles working their way up thru the dirt. Clean it out and it should quiet down.

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Unknown

sedement in a boiler

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Unknown

noise

Aside from dirt you might have air trapped in the boiler.
Air in the boiker causes the hot water to flash into steam.

If it is air you can lower the boiler operating temperature to 160 degrees, make sure the boiler water pressure is 4 pounds above static pressure, replace the main vent valve and let the system run a couple of days.

After the air is out reset the boiler operating temperature.


Jake