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Thread: Electric Tankless or new Heat Pump type

  1. #16
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    The heatpump versions typically have slow recovery rates, so having more hot water stored may be a big advantage. In order of typical response (faster first), you'd have: gas, electric, heatpump. So, especially if the 80-gallon job was well insulated, it may not be too large (from a use point, maybe not from a physical size issue). If a heatpump version has resistance backup, on some uses, it may not be any more efficient than a typical electric WH.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  2. #17
    DIY Member bmcgin's Avatar
    Join Date
    Apr 2010
    PC Beach, FL


    Quote Originally Posted by Redwood View Post
    Only the Steibel Eltron uses a smaller resistance heating element for highest efficiency...
    It is the only one that can be installed with a 15 amp circuit the others need a 30 amp circuit....
    GE: 30 amp, Smith: 25 amp, Rheem: 22 amp, Steibel: 15 amp

    Energy Factor:
    GE: 2.35, Smith: 2.4, Rheem: 2.0, Steibel: 2.5

    So the Steibel will draw less amps and makes the best use of energy. Looks like a very good product.

    Only problem is the size, it’s 26” round. I have space for 24”. So unless I want to start revamping ductborad, it’s not going to fit.

    My current water heater is actually a 40 gal and we’ve never run out of HW, so a 50 gal should be sufficient. 99.9% of the time this water heater supplies 1 full bath (for a 4 yr old), kitchen sink and dishwasher.
    Last edited by bmcgin; 10-30-2010 at 08:20 PM.

  3. #18
    Master Plumber Redwood's Avatar
    Join Date
    Dec 2007


    Actually the Stiebel Eltron Accelera 300 draws a maximum of 9.16 amps.

    What you should also look at is the 1st hour delivery...
    Your present unit is probably in the mid 50 gallon range....
    Stiebel Eltron Accelera 300: 78 gallons
    GE GeoSpring Hybrid: 63 gallons
    Rheem/Ruud Hybrid: 67 gallons
    AO Smith Voltex: 70 gallons

    But the AO Smith Voltex is also an 80 gallon tank like the Stiebel Eltron Accelera 300 so there might be dimensional issues with that as well.

    The Stiebel Eltron Accelera 300 has a single 1750 watt element.

    The AO Smith Voltex upper element is a 4,500-watt element and the lower element is a 2,000-watt element.

    The others all use 2-4500 watt elements...
    Last edited by Redwood; 10-31-2010 at 06:41 AM.

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