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electric tankless water heater

about to make decisions on which water heater to buy, wanted a Takagi but they only do gas heaters.
Hoping to eventually run the system on solar (or at least partially) which is why electric.
Existing wooden floor on top of which I will run pet hose and then a new subfloor and a finish floor.
2000 sq. ft. divided into 4 or 5 zones, plus one zone for a small bathroom downstairs from this with pet embedded into concrete.
Anyone have a good suggestion for a heater?


  • ZmanZman Posts: 5,334Member
    What you want is an electric boiler, not a water heater. There are quite a few on the market. Ideally you would use one with outdoor reset capabilities.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • Jamie HallJamie Hall Posts: 11,458Member
    Figure your heating load before you buy anything...

    As @Zman says, there are quite a few electric boilers on the market. Be sure that your electrical service can handle the load, however. As a WAG ballpark, you're likely to need at least 40 KW, which is over 150 amps on the normal residential 240 volt supply.

    If you are planning to eventually go to solar photovoltaic, also keep in mind that in full sun, you will need a minimum (with current technology) of 200 square meters of solar panel to supply that load -- but that the sun doesn't always shine, so you'll need more (a typical WAG is 8 times the area) or 1600 square meters of panel (about a third of an acre), plus storage batteries (that's variable with where you live, of course).
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • hot_rodhot_rod Posts: 12,037Member
    May be worth looking into air to water heat pumps. Heat, cool and provide DHW at a much better efficiency, when compared to electric resistance boilers.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • franklinsfarmsfranklinsfarms Posts: 2Member
    Thank you all, lots to look into.
    I did think of augmenting the solar part with wind technology.
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