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Thread: Install Electric WH in series with existing tankless

  1. #16
    DIY Junior Member rootuser's Avatar
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    Jan 2012
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    Silicon Valley, California
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    I suppose it's a good start until I get a new tankless that can handle more volume. If I'm good for a 10-15 minute burst at full hot that will be enough in most situations right now. At some point I'll look at running them a little different to better address the volume problem. At this point I'm doing one thing at a time, and fixing the short-cycle problem would be a win right now.

    Anyone have a suggestion on a decent 10-20 gallon electric tank waterheater? Do you know what kind of circuit I will need to run? Is a 20-amp dedicated enough or should I run a 30? I can do either as this will be a new circuit I'm installing just for the water heater.

  2. #17
    Retired Defense Industry Engineer jadnashua's Avatar
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    Sep 2004
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    New England
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    Run a 30A, 240vac circuit, then, you can install almost any residential electric WH. On a 20A branch, you limit your choices. The wire will cost you more, but the flexibility is worth it.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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