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Thread: gas pipe size

  1. #1
    DIY Junior Member randolph56's Avatar
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    Default gas pipe size

    Good morning all. Don't know if this is the right forum but here goes. I want to replace my current 40 gal NG water heater with a power vent model.(AO Smith GPVD40?) The current heater is next to the boiler sharing the flue and about 40' from where I need the hot water. I want to move the WH over to the other side of the house right below the kitchen and 2nd floor bath and vent it thru the foundation. There is a 3/4 gas line that supplies my stove about 5' from where I'm going to move the WH to. The current 1 shares an 1 1/4" feed that breaks down to 2- 3/4" drops, 1 to the WH and 1 to the boiler (both are further reduced to 1/2"). Finally, the question. Does the 3/4" that feeds my stove have enough volume to also feed the WH. or should I increase the size to 1" or 1 1/4"? Any feedback would be appreciated. Thanks

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Jim DeBruycker
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  3. #3
    General Engineering Contractor ballvalve's Avatar
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    Default

    Sounds fine to me unless its huge range with a grill and 12 kids at home. Try it, cant hurt anything.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Recommended gas lines sizes depend on several computations none of which you have given us.

  5. #5
    DIY Junior Member randolph56's Avatar
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    Cool gas size

    Thanks for the replies. After I posted and then did some more searching I realized that I didn't give enough info. From the link I figured what cfh was needed and the capacity/volume of 3/4 with the length and # of 90's etc. So, yes in my case 3/4 will handle what I need, but just to be sure, I called the utility. Thanks again.

    Last edited by Terry; 04-29-2011 at 06:22 PM.

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