Dual water heaters

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by Spaceman Spiff, Aug 31, 2004.

  1. Spaceman Spiff

    Spaceman Spiff Architect

    Messages:
    277
    Location:
    Salt Lake City, Utah
    I am designing a new home and want to have dual water heaters since we have four kids and two adults. I will be installing a hot water recirculation system and was wondering if I should plumb the heaters in series or parallel. The house will be on LP gas and probably 40-60 gal per heater. Also, any suggestions on designing my systems better are welcome. (Water well, septic, 4 bath...) Thanks!!!
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,258
    Location:
    Cave Creek, Arizona
    Regardless of other's opinions, I do not feel that you can pipe a set of heaters in parallel, without using an engineered manifold, and get equal flow through them. I always do a series installation, and with a circulator pump I feel it is even more important to do so, since the pump will tend to keep both heaters at the temperature of the highest setting regardless of the setting of the other tank or if its thermostat has different parameters than than that one.
  3. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    I agree with hcj about not trying to do parrallel. Depending on the layout of your house ( i.e. multi story, rambler, etc. ) you could consider a split system, that is two completely separated hot supplies.

    I do not have any information on the efficency of this compared to a 2 tank series system. But it would allow you to have one system "hot" perhaps dishwashing, clothes washing,etc. and one system "warm" ...showers, lavs.
    Perhaps others can comment on this.
  4. Spaceman Spiff

    Spaceman Spiff Architect

    Messages:
    277
    Location:
    Salt Lake City, Utah
    So in series... Should I put the first one at a lower temperature (kind of a pre-heater) and run the pump thru the second heater only? Also, what would be the best insulation for the pipes to reduce heat loss?
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,258
    Location:
    Cave Creek, Arizona
    dual heaters

    There is almost no advantage to circulating through the single heater.
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