twin hot water heaters

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by smiddleton, Aug 2, 2006.

  1. smiddleton

    smiddleton New Member

    Aug 2, 2006
    My installer put in twin 86 gallon Propane hot water heaters and it appears that the cold water feed goes into the first unit and then out into the second unit. I have a sometimes small hot water load and during the heating seasons I will have a larger load for my radiant heating.

    I would think that the first unit would work very hard and the second unit would only be receiving pre-heated water and would not work hardly at all.

    I also have a recirculation pump that keeps instant hot water that feeds into the second hot water heater.

    Information on the best way to have these units installed is limited at best; especially considering the needs of my hydronic radiant heating.

    Any suggestions on how these units should be configured?
  2. Master Plumber Mark

    Master Plumber Mark Sensitivity trainer and plumber of mens souls

    Feb 6, 2005
    Sensitivity trainer.. and plumber of mens souls
    indianapolis indiana - land of the free, home of
    installed in series

    I suppose these propane hot water heaters are

    doing your potable needs and your radiant heating too


    they are hooked up in series and its always the way I hook up

    two heaters together......

    usually setting the first one on low and the second one on med to high

    seems to work the best and you have better flow rate through

    both of them than tieing them in parrell...

    this is something you might have to turn up higher during the winter months

    but it is the best way to do it...

    I wonder how economical propane radiant heating with
    those heaters will be??
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  4. Spaceman Spiff

    Spaceman Spiff Architect

    Aug 31, 2004
    Salt Lake City, Utah
    I have two hooked up like you say and the first makes warm water, the second hot water. Because of the recirc pump the second kicks on ocassionally w/o water use (to reheat the cooled recirc water), but the pair kick on almost at the same time when someone runs the shower or bath. The thermostats are set like MPM says. With a little tuning it should work quite well...
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