3 Tanks In A Line: Venting

Discussion in 'Water Heater Forum, Tanks' started by molo, Sep 23, 2009.

  1. molo

    molo Member

    Sep 23, 2006
    Cold New York
    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
  2. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    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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