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  1. #1
    Join Date
    Apr 2008
    Posts
    23

    air vs water heat pumps in massachusetts

    Hi all,

    I am trying to decide on air source vs water source heat pump for residential hvac north of Boston MA.

    Ground loop is not a possibility pump & dump not a possibility. SCW with bleed is a possibility.

    GWHP sounds great but I cant get a handle on the well pump losses.
    I have heard that the well pump bill can approach the heat pump kwh usage.
    So much for high COP numbers. any comments on that?

    Also how long will a well pump last under heat pump type loads?

    Heat load calc is coming, currently whole house is adequately heated with .85 gpm oil burner. around 100kbtu/h.

    Install even though i have the well already is $$$$ for geo, less for air.
    not sure i can recoup the difference. any comments?


    thanks!

  2. #2
    Join Date
    Mar 2008
    Location
    Taunton, MA
    Posts
    93
    sounds like you have an oil fired warm air system, i recomment a good efficient 3 pass boiler with a hydro-air unit and indirect water heater, it's a good set up in your area

  3. #3
    Join Date
    Apr 2008
    Posts
    23
    thanks hotwater

    pretty much have that except the burner is about 9yrs old.
    went through 1400 gallons of oil last year not looking to do that again.
    insulation quote on the way.....

  4. #4
    Join Date
    Sep 2004
    Posts
    654
    1400 gallons??......where did that much oil go? Are the windows closed when you have the heat on? J/K...but really, that is ALOT of oil burnt for a home heating, unless you've got a 5000 sq. ft house!!!

    You're right on the insulation thought, no matter how efficient the heating unit could be, if the heat is just going outside, savings will be challenging. Improved insulation gives comfort too, improving the burner efficiency won't do that.

  5. #5
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,233

    Question

    Quote Originally Posted by Dunfudgin View Post
    pretty much have that except the burner is about 9 yrs old.

    went through 1400 gallons of oil last year
    not looking to do that again.
    ... sounds like dual fuel should be evaluated

    .. TWO air source heat pumps might be reasonable
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

  6. #6
    Join Date
    Apr 2004
    Posts
    104
    Quote Originally Posted by casturbo View Post
    1400 gallons??......where did that much oil go? Are the windows closed when you have the heat on? J/K...but really, that is ALOT of oil burnt for a home heating, unless you've got a 5000 sq. ft house!!!

    You're right on the insulation thought, no matter how efficient the heating unit could be, if the heat is just going outside, savings will be challenging. Improved insulation gives comfort too, improving the burner efficiency won't do that.
    Really, that is average I feel.

  7. #7
    Join Date
    Apr 2008
    Posts
    23
    Quote Originally Posted by casturbo View Post
    ALOT of oil burnt for a home heating, unless you've got a 5000 sq. ft house!!!
    good guess on the footage
    4500sf +hot water is off the oil as well.

    I know we have infiltration problems, cold floors when it blows etc.
    air handler in the attic. have to condition that space.

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