Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Water boiler banging

Snowmelt Member Posts: 1,405
I have a customer with a water boiler that I think when it shuts off it bangs almost sounds like a steam boiler bang when the steam hits the water..................or when a zone valve closes but it’s three pumps ( taco with ICV 007 ) 2 baseboard zones and 1 radiant floor I all get measurements later but I think linier feet it’s about 120 feet including return to boiler.
If it was air would I be hearing it all the time like an ocean.


  • JohnNY
    JohnNY Member Posts: 3,226
    When a water boiler bangs it's because it's boiling internally which is created by a lack of flow. Check your pumps and back off of your aquastat 10° or so and then reassess.
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Consulting & Troubleshooting
    Heating in NYC or NJ.
  • kcopp
    kcopp Member Posts: 4,395
    What boiler is it? Make/ Model?
  • Snowmelt
    Snowmelt Member Posts: 1,405
    Thanks John, I will back off the aqua stat and see what he get.
    kc, it’s a Utica 80 % standard in chimney , but I look later.