I just drained the hot water heater, as I do every year (using the following video for instructions: https://youtu.be/qqaehhGYV_I). This time, the pressure relief valve had a slight hiss after I refilled the tank and closed the valve.

I noticed today the discharge valve on the side of the house is spewing hot water continously from the hot water heater.

Do I need to replace the pressure relief valve, or what is the issue?


Sometimes when you open older valves, they get stuck open. If you can't get the valve to reset, you'll have to replace it.

  • Yes, try opening and closing the valve to see if it will re-seal itself. – ArchonOSX Apr 12 '16 at 9:50
  • @ArchonOSX Tried and it didn't work. Going to have to replace. – user2966445 Apr 13 '16 at 14:31
  • Bummer, yeah it is probably scaled up with lime over the years. – ArchonOSX Apr 14 '16 at 0:22
  • 3
    Valve replaced and no more leaks. Lots of buildup inside the old valve. – user2966445 Apr 16 '16 at 19:12

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