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Filling Steam Boiler makes Hot Water tank gurgle

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itzasean
itzasean Member Posts: 71
in Strictly Steam
So this is weird. I was cleaning my Boiler and when it was time to fill it back up, the gas hot water tank beside me started to gurgle. I thought it was sucking from the tank so I shut the valve bringing cold water into the hot water tank and it still did it. I shut the hot water so they were both shut and it stopped?
Also after adding water to the boiler, how long should I run it to burn off minerals etc?

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  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 7,835
    edited October 2022
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    When you open the valve to fill the boiler, the water pressure in the DHW tank will drop. This noise is normal. Sometimes there are metal parts of the water heater that are hotter than the water in the tank. If you lower the water pressure, those hotter parts will allow some of the air that is dissolved in the tank, to flash-off some micro bubbles. If enough micro bubbles join together, they become a larger bubble that is more buoyant and will crash into other sections of the tank and give up a harmless noise, like air bubbles sometimes do.

    Oddly enough, the same thing happens when you open the tap to fill the tub or a garden hose to water the flowers or fill a bucket. But like the tree falling in the forrest, when no one is there to hear it... you are too far away to notice.
    Edward F Young. Retired HVAC ContractorSpecialized in Residential Oil Burner and Hydronics
    itzasean

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