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Thread: 3 Tanks In A Line: Venting

  1. #1
    DIY Senior Member molo's Avatar
    Join Date
    Sep 2006
    cold new york

    Default 3 Tanks In A Line: Venting

    The situation is there are 3 natural gas water tanks in a line. A 40 gallon tank and 2 -30 gallon tanks (in that order from building exit point to the rear). A friend raised the question that they were not vented properly. He was worried about the available combustion air in the basement and stated that if there was not enough combustion air when the 40 gallon tank turned on it could create a pull on the rear tanks vents and pull CO into the basement. These tanks are all located in a 750 sq. ft unfinished basement. What is code on venting 3 tanks in sequence like this?

    Thanks for any replies
    "Any American who is prepared to run for President should automatically, by definition, be disqualified from ever doing so."
    Gore Vidal.

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default venting

    The same as for a single tank. There has to be adequate provision for combustion air, (at least on square inch of free area for each 1,000 btu's), and the flue has to be adequate for the total btu's of all the burners.


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