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MZ 25S Relief valve(s)?

Visitor
Visitor Member Posts: 2
in THE MAIN WALL
Baltimore City and National Standard Plumbing Codes require temperature and pressure relief valves (TPRV)for hot water heaters and boilers. The MZ25S is equipped with a TPRV but it is not ASTM rated. The MZ instructions indicate a pressure relief on each of the pipes. Can this boiler be installed without either an additional pressure relief valve or a temperature presure relief valve under the Codes? If not, can it be installed with just a pressure relief valve on the hydronic circuit? Or, do the Codes require a pressure relief valve on both? Or, must it have a temperature and pressure valve(s)?

Comments

  • Big Ed
    Big Ed Member Posts: 1,117


    If MZ instructions stated to install TPR valve on both line , put it in , even if local codes states just one. Don't redesign a system . If you do and God forbid something happens , it's your baby...



  • Visitor
    Visitor Member Posts: 2
    MZ 25S Relief valve(s)?

    We are getting conflicting advice form various interested parties. I wanted to know what the codes said.
  • Mark Eatherton1
    Mark Eatherton1 Member Posts: 2,542
    Most codes

    defer to the manufacturer. If the manufacturer recommends 2 widgits, there'd better be to widgits on it or the inspector CAN turn you down.

    THere is generally a reason for them asking for two, and it's not always obvious to the plumber.

    Follow the makers instructions to avoid trouble/liability.

    ME



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