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Thread: Is it feasible to connect two hot water heaters to one fixture?

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  1. #1
    DIY Senior Member jeff_bathroom's Avatar
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    Default Is it feasible to connect two hot water heaters to one fixture?

    Hi,
    I've torn everything out of my second bath and when
    I connect up the new tub, I'll be using hot water from a different
    water heater so that this bath doesn't share the same hw heater
    as the master bath.
    I wondered though if it is possible to connect both the original
    hot water line and the new one into a T, then into the tub hot water
    line? The idea of course being that there'd be almost twice the
    available hot water. Seems logical, but I guess I'm expecting a pro
    to tell me about some backpressure issues. What say ye?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Question

    Possible, but maybe problematical. If the lines don't present similar resistance/restrictions, you might not get the benefit of the second source. There have been some recent discussions about running them in series vs parallel. You might want to search on that for some enlightenment!
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Senior Member jeff_bathroom's Avatar
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    Default

    Thanks Jim,
    I didn't know to search for "in series" or "in parallel", but after researching, I see lots of contraversy. Eeeegads, I'm not touching that one! One hot water heater it is. Although it would seem there should be some nifty little inline device that makes parallel heaters work without trashing them.

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    DIY scratch-pad engineer leejosepho's Avatar
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    Default

    Quote Originally Posted by jeff_bathroom
    ... it would seem there should be some nifty little inline device that makes parallel heaters work without trashing them.
    Yes, somewhere there just has to be some kind of flow-control device (similar to a mixing valve) that will combine the two sources together in parallel, and likely with an adjustment for drawing more flow from one source than from the other, if desired.

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    Homeowner geniescience's Avatar
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    Default series for what you want

    hi jeff !!

    instead of plumbing them as separate systems, you can get the benefit of having more HW available in both baths and throughout the house, if you do a series installation. Series is a no-brainer. It is true that almost-simultaneous demand in both tubs might drain the last one of the series, which is the one likely to be set to the highest HW temperature. Not a big concern, imho.

    david
    Last edited by geniescience; 03-07-2007 at 06:36 PM.

  6. #6
    DIY Senior Member jeff_bathroom's Avatar
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    Default

    Sorry David,
    no in-series for me. Yours is one of the "pro" opinions of
    "in series" and there are plenty of folks who think in series is
    a bad idea along with those who think in parallel is bad or worse.
    Like Jim is agreeing above, there must be a pressure control device
    of some kind out there to run heaters properly in parallel. It either doesn't
    exist, doesn't work if it exists or we simply don't know about it.
    Anyway, in series seems to make more sense for new installations
    or cases when you're adding a second hot water heater rather
    than two that probably exist on opposite sides of the house like mine.
    Thanks for the opinion though; I'm always interested.

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