Heat Pumps MORE Efficient to run that hot water loops ?

Discussion in 'HVAC Heating & Cooling' started by chefwong, Apr 21, 2010.

  1. chefwong

    chefwong Member

    Jun 14, 2006
    District of Columbia
    We have a closed loop hot water/cast iron baseboard setup.

    Fujitsu ductless rep just left. Go figure but he swears he doe boiler maint. as well. Gas is generally cheaper than electric out here in NYC but he's telling me that it most likely would be cheaper to run the heat pumps in the Fujitsus than using the hot water closed loop system.

    Go figure. Something about the heat pump technology.

    Thoughts, feedback, etc ?
  2. Lightwave

    Lightwave New Member

    Aug 20, 2007
    Vancouver, BC
    Heat pumps can be cheaper than gas boilers to operate in many locations. It depends on the local cost of gas per therm, the local cost of electricity, the climate, and the heat pump's capabilities.

    For example, if you have a heat pump with an average COP of 3 for your climate, the heat pump will be cost effective as long as the total cost of electricity per therm is less than three times the total cost of gas per therm. The hard part is figuring out the average COP and the costs of energy in comparable terms.

    Note that Fujitsu's mini splits won't work below 14F. If you want to use mini splits for your only heat source, you should be looking at Mitsubishi or Daikin equipment. Mitsubishi has the best low temperature performance on the market right now and Daikin makes an air to water heat pump that can drive low temperature radiators.
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  4. chefwong

    chefwong Member

    Jun 14, 2006
    District of Columbia
    I was atually looking at the mini splits for ac primarily when he mentioned the heat savings possibilty.

    I have yet to get quoted on the MrSlim.
    It was my understanding the Mitsu and Fujis are very on par with each other.
    Daikin Close.

    Sanyo would be right below Daikin.

    Everything else is nice, but nowhere near the quality of the above brands mentions.
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