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Energy Kinetics System 2000 - Water Heating Question

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  • #16
    Re: Energy Kinetics System 2000 - Water Heating Question

    Originally posted by kwfrancis View Post
    huh. those numbers look like something that i should look into a bit. how did you come to those numbers? and are there formulas or specs on a water heater that i can pull from a website to run through those equations?

    most of the specs on various websites say that the electric heaters will heat 25 gallons per hour at "a recovery at 90 degree rise" whatever that is.
    The 121,000 BTU comes from the side of an EK1, when it burns 1 gallon of oil per hour. You can also get it from

    The 9000W comes from the Rheem site which says two 4500W elements. A watt-hour is 3.41 BTU/h (from Wikipedia), which is why I got 30690 BTUs for the electric. They claim 21 gallons at a 90 degree rise.

    The recovery rate is basically how much heat the system can put into the water during an hour. If you have colder incoming water you need to input more heat than with warmer incoming water (say the difference between NH in the winter and FL in the "winter"). So the 90 degree rise is how much they are assuming you want to increase the temperature of the water (Energy Kinetics bases it off 77 degrees instead).

    1 BTU raises 1 pound of water 1 degree, so you need 8.3 BTUs to raise a gallon of water 1 degree. Lets assume we want to raise the water 90 degrees. That means we need 747 BTUs per gallon of water (8.3 * 90) we want to heat. For the System 2000 that means we have 121,000/747 = 161 gallons of new hot water in an hour. For the electric we have 30690/747 = 41 gallons, but that is assuming perfect efficiency for electric. The manufacturers must know that not all of the electricity is getting converted into heated water (or it can't really use 9000W) in their calculations (which is why they have a lower number than 41 gallons).


    • #17
      Re: Energy Kinetics System 2000 - Water Heating Question

      If you decide to deep six the plate exchanger all you need to do is shut off the valves going to it and pull the thermostat wires (for the heater) off the manager