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  1. #14
    Join Date
    Aug 2015
    Posts
    2
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    thanks

    Thank you exactly what I needed

  2. #15
    Join Date
    Jun 2011
    Location
    Virginia Beach VA
    Posts
    50
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    Quote Originally Posted by geodesist View Post
    1) is it cost efficient compared to gas? I understand it really would only be beneficial in the cooling season
    The system uses a desuperheater for heat recovery water heating. As such, in cooling mode, it is only recovering waste heat that would be otherwise thrown away. There is no "energy cost" for this heat so it should compare favorably to a HW system that uses any paid-for energy regardless if the energy is gas, propane, oil, etc. The cost of the avoided energy is the savings, so it may be less with NG than other energy sources since NG is pretty cheap right now. But remember, you are comparing "free" to something that has a cost so of course there is a savings.

    Note - in heating mode the water heating is not free. However it still leverages the COP of the heat pump so it can be 2.5-6 times cheaper than running an electric element heater, oil, or propane. Compared to NG heater, when used in heat pump heating mode, there may not be any significant savings. A detailed cost calculation would be needed to see if the desuperheater circuit should be allowed to operate when the HP is in heating mode.

    Further note - there is a small electrical draw associated with the heat recovery circulating pump. In cooling mode this can be offset by a little lower head pressure/lower amp draw on the compressor so usually it does not really need to be considered, actually it’s possible to see a small net electrical savings in addition to the free water heating.

    Something most people don't consider is that heat recovery water heating can be easily added to most any new or existing normal air conditioner, it doesn't have to be a geo unit.

  3. Likes Juan Madera liked this post
  4. #16
    Join Date
    Jan 2013
    Posts
    19
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    I know it makes sense to use the desuperheater when heating, but does it make sense to use it when heating2 kicks in?

  5. #17
    Join Date
    Jun 2011
    Location
    Virginia Beach VA
    Posts
    50
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    Not enough info. Your contractor should be able to calculate it.

  6. #18
    Join Date
    Mar 2018
    Location
    Maryland
    Posts
    211
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    Quote Originally Posted by woot4fun View Post
    All summer long, when you would expect the hot water production to be the best, the water exiting my climatemaster was hardly warm. In testing with a digital thermometer, water entering the system was going in at 80-85 degrees and exiting at about 95 degrees. Small increase, so I am sure it is doing something, but no where near the 130 that some of the waterfurnace folks talk about. This was tested on 95 degree days in the summer when I would expect tons of heat being built up in the house.

    We have two water tanks. Tank 1 sent to 130 degrees, tank 2 set to 95 degrees. The geo pulls from the bottom of tank 2 and feeds into the top.

    I have called my installer and asked and they have told me "you can't heat all of your water with the geo"..

    If someone else is having better luck I would love to know.

    My neighbors on both sides have waterfurnace and both indicate that their hot water is noticably warmer in the summer, they assume because of the geo, than winter.

    just my $0.02
    Every hwg system I’ve ever put in pulls from the top and feeds to the bottom and your buffer shouldnt have power to it. Sounds to me like the geo itself needs to be serviced check your he/hr to get a better view of operation.
    Last edited by Pres1227; 05-17-2018 at 08:58 PM. Reason: Wrong quote

  7. #19
    Join Date
    Mar 2013
    Location
    Billington Heights, NY
    Posts
    21,628
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    Quote Originally Posted by geodesist View Post
    (I understand that pricing is against the rules, just wondering if it makes sense)
    pricing of systems is against the rules. discussions of energy costs is not.

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