Can I use a 300,000 BTU rated furnace gas valve on a furnace rated at 80,000 BTU input & 64,000 BTU output?

Update:

Note:  Both existing gas valve & possible replacement gas valve, have a manifold pressure of 3.5" W.C.  However, existing gas valve's, 'designed maximum outlet' pressure is 11" WC & the possible replacement is 14" (1/2 psi).

Update 2:

Also note:  Gas lines & electrical connection locations all appear to be in the same place,

4 Answers

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  • 1 month ago

    Assuming the fitting match, a valve with a MAXIMUM rating more than required won't hurt.

  • Anonymous
    1 month ago

    Are you talking about the pressure regulator?  If you are on natural gas, that regulator belongs to the gas company, and you will have problems with them if you mess with it.  So where is the limiting device that sets the gas flow to no more than the 80,000 BTU gas flow rate for the furnace? Where is the old valve and what is its rating? Are you replacing a device exactly in kind? It sounds like you are trying to save a few dollars and are going to burn down your house.  Be sure and put the dog outside before you light the furnace.

  • Droopy
    Lv 5
    1 month ago

    If you want to find out how darwinism works go ahead.   Just make sure you're the one person in house while operating it.

  • 1 month ago

    Since the new valve has a much higher capacity it could overwhelm the gas burners so I would not use it. If it is the pressure regulating valve then all the more reason to not use it. It will not be able to modulate and maintain a constant downstream pressure.

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