What size? What vent system?

Discussion in 'Water Heater Forum, Tanks' started by karter56, Feb 20, 2013.

  1. karter56

    karter56 New Member

    Feb 19, 2013
    Charlotte, NC
    Time for a new gas water heater. 3 bath house but only 3 of us living there. Company only once a year. Furnace has a hot water coil but hot water circulates back to heater. Not sure if a 50gal, 40,000 btu is enough. Have a 30gal feeding a 50gal right now. Seems like overkill. Current model is a direct vent. Heater is in a 10ft tall crawl space. Do I have to use a direct vent system?
  2. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    You really have 3 different situations;

    1. Does the furnace have any control to prevent it from overheating the water heater stored water
    2. Do you need 80 gallons of hot water
    3. Why was the direct vent installed

    All of these will affect your final decision some way. For the average family, a 50 gallon conventional water heater would be adequate.
  3. Sponsor

    Sponsor Paid Advertisement

Similar Threads: size vent
Forum Title Date
Water Heater Forum, Tanks New Water Heater: Traditional Vent vs Power Vent, What Brand, What Size Nov 15, 2013
Water Heater Forum, Tanks Which size would you go with? Sep 29, 2015
Water Heater Forum, Tanks Trying to get verification on water heater wire size Aug 25, 2015
Water Heater Forum, Tanks What size threads are used on drain valve (Rheem Fury elec. WH) Jul 17, 2015
Water Heater Forum, Tanks Water heater size with and without tempering valve Jul 12, 2014

Share This Page