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Gas valve trains

pbr6464 Member Posts: 2
When a 500,000 btu gas heating boiler comes shipped with a single gas valve wouldn't the appliance fall under "Large Appliances" and requires two gas valves for safety as a U.L. listed product does or can a single gas valve be used if it performs certain functions.

Thank you


  • Tim McElwain
    Tim McElwain Member Posts: 4,588
    What is the valve make and model number. Heating valves today (since 1979) are dual seated (redundant). Let me know the numbers and manufacturer and I will tell you if it is okay. The cut-off used to be 400,000 but depending on the boiler classification it can be larger and still not be considered a large burner.
  • pbr6464
    pbr6464 Member Posts: 2
    I wouldn't have access to the valve for a couple of days but will see if I can get more imformation.

    Thank you