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  1. #1
    Join Date
    Feb 2008
    Location
    centrel ny
    Posts
    2

    Question how can I est. oil consumption for a 2500sq

    Can any one help ,I have 2500 sq ft house with 2 oil furnaces(forced air) and a hot water oil furnace we have used 400 gals in 50 days as well as heating with some wood thats about $600p/month OUCH! can that be possible

  2. #2
    Join Date
    Nov 2007
    Location
    Landisburg,PA
    Posts
    69
    very possible the price is whats killing people. lots of people think they are useing more fule but most of the time they are not its the prices goin up and down that gets you.

  3. #3
    Join Date
    Nov 2007
    Location
    Landisburg,PA
    Posts
    69
    just wanted to add something else programable stats could help a little bit.

  4. #4
    Join Date
    Feb 2005
    Location
    MA
    Posts
    150
    At 85% efficiency, your usage translates to an average 49MBH load. For an older house with poor insulation in upstate NY and the recent weather, your consumption is not out-of-line. Look at upgrading envelope as well as that setback thermostat.

  5. #5
    Join Date
    Jun 2006
    Posts
    294
    What is/was;
    Age of house
    Average outside temperature durng those 50 days
    Temperature setting of house
    If I assume an average of 30 deg, then the total deg days would be
    35*50=1750. If you used 400 gal, your socalled "k" factoris:
    1750/400=4.4
    which is pretty low for your house. I would say that it should be up to at least 6.
    So if the assumption on averge outside temp is right, or even high, then you have poor insulation or poor furnace efficiencies or both

  6. #6
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,789
    Quote Originally Posted by ps View Post
    At 85% efficiency, your usage translates to an average 49MBH load.
    How do you know he's getting 85% efficiency.

    Could be much less.
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  7. #7
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,789
    You also were using wood.
    Is it a fireplace, or a wood stove.
    When you use wood, you bring a lot of cold fresh air into the house. Which can cause you to burn more oil heating up theareas that the fresh air came through.
    If its a fireplace. Check to make sure the damper is closing right. Or you will use a lot of oil.

    Can you improve the air tightness of your house.
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  8. #8
    Join Date
    Feb 2005
    Location
    MA
    Posts
    150
    The 85% was just an assumption to ballpark his load. If his efficiency is lower then his average load is higher. Depending on his location and the past 50 days average temperature, that average load may point to issues other than his equipment - like the envelope (increased infiltration created by the wood fire, for instance).

  9. #9
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,789
    I have always found it better to use a lower eff, then assume the highest.
    Few oil burners maintain their eff for the heating season.

    Oil fired water heaters tend to lose eff fairly quick.
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  10. #10
    Join Date
    Feb 2005
    Location
    MA
    Posts
    150
    So with the info given, what number would you use?

  11. #11
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,789
    80% max, if I know the burner and furnace, and know how long it holds its efficiency through the year.
    I usually use 77% if no other info.

    Oil fired waterheaters, just don't have enough insulation. So if the customer likes their water real hot, they use a lot of oil.


    My own furnace is down to 74% at the moment, gotta clean it this week.
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  12. #12
    Join Date
    Feb 2008
    Location
    centrel ny
    Posts
    2

    Hmm GUYS THANKS FOR ALL YOUR REPLYS oil consumption

    Quote Originally Posted by hvactech1jm View Post
    just wanted to add something else programable stats could help a little bit.
    My wood stove is in my bed room so thats not the issue/my house is pretty well insulated and newly remodeld.I do have tall ceilings.my furnaces are less than 10 years old .On a average 20 degree day can a single furnace burn 10 gals of oil a day with the thermostat set @ 67 and not running all the time?

  13. #13
    Join Date
    Feb 2007
    Location
    18951
    Posts
    1,593
    How many degree days have you had this winter?

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