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  1. #1
    Join Date
    Jun 2009
    Posts
    146

    1 kWh per hour just running fan

    Is it possible that just running the fan on my furnace is using 1 kWh per hour? Last night before I went to bed, I checked the meter and let the fan run all night. To my surprise, 8 hours later the meter moved 8 kWh.

    I know we have other appliances that draw some energy when they are off (DVRs, computers, etc.), but I was surprised by this.

    If it consumes this much energy just to run the fan on my furnace, I may end that practice altogether.

  2. #2
    Join Date
    Sep 2002
    Location
    Northeast Ohio
    Posts
    4,802
    Would depend, I normally figure .5kw per 24 but all electric using devises can vary. You got a fridge, hot water tank, security lights etc.? Turn off the blower and check it tonight.
    A good HVAC tech knows how, an educated HVAC tech knows why!

    DEM


  3. #3
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    33,396
    A gas furnace blower motor may run around 700-800 watts so you could round that up to 1 kw per hour. A VS blower running 1/2 speed for constant fan runs under .1 kw per hour by comparison. You may be surprised at how many items in your house are drawing power when off too.

  4. #4
    Join Date
    Jun 2009
    Posts
    146
    Quote Originally Posted by heaterman View Post
    Would depend, I normally figure .5kw per 24 but all electric using devises can vary. You got a fridge, hot water tank, security lights etc.? Turn off the blower and check it tonight.
    Thanks. I'll give it a try tonight without the blower on and see what the difference is.

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,792
    If you have an electric water heater, it may have come on.
    Your refrigerator most likely ran during the night.
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    How many times must one fix something before it is fixed?

  6. #6
    Quote Originally Posted by david8370 View Post
    Thanks. I'll give it a try tonight without the blower on and see what the difference is.

    You would be surprised to see what your other appliances are using electricity wise. I just went through this in my whole house.

  7. #7
    Join Date
    Sep 2009
    Location
    S.C.
    Posts
    1,280
    A 1.5 hp motor is 1.12 Kw! I'm actually surprised that you didn't consume more than 1 kw a night considering computers, HotWater, TV's and wall warts. In most all new TV's the power supply is hot constantly.

  8. #8
    Join Date
    Jun 2009
    Posts
    146
    .. edit

  9. #9
    Join Date
    Jun 2009
    Posts
    146
    Quote Originally Posted by beenthere View Post
    If you have an electric water heater, it may have come on.
    Your refrigerator most likely ran during the night.
    I don't have an electric water heater, but how much would a typical side by side use an hour do you think?

  10. #10
    Join Date
    Jun 2009
    Posts
    146
    Quote Originally Posted by BaldLoonie View Post
    A gas furnace blower motor may run around 700-800 watts so you could round that up to 1 kw per hour. A VS blower running 1/2 speed for constant fan runs under .1 kw per hour by comparison. You may be surprised at how many items in your house are drawing power when off too.
    My furnace is the Rheem RGRL-90. Can't find anywhere in the documentation how many watts it uses... I know it depends on a lot of things. The fan setting is on low, where I'm at about 1035 cfm based on my ESP.

    http://globalimageserver.com/fetchDo...b-ef31233d6cbf

  11. #11
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,792
    Quote Originally Posted by david8370 View Post
    I don't have an electric water heater, but how much would a typical side by side use an hour do you think?
    I'd guess several hundred.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  12. #12
    Join Date
    Sep 2009
    Location
    S.C.
    Posts
    1,280
    Per you info sheet, your blower is a 3/4 hp so the watts should be 560. I'm still thinking you're about where you should be. I haven't checked my Kw cost today but it was 8 or 9 cents a kw/h last time I looked (several years ago).

    Going back to your sheet, they list the motor as 3/4 hp and then [559]

    MOTOR H.P. [W]– SPEEDS–TYPE 3/4 [559]-4-PSC (copied and pasted from the sheet)

  13. #13
    Join Date
    Jun 2009
    Posts
    146
    Quote Originally Posted by Home&Marine View Post
    Per you info sheet, your blower is a 3/4 hp so the watts should be 560. I'm still thinking you're about where you should be. I haven't checked my Kw cost today but it was 8 or 9 cents a kw/h last time I looked (several years ago).

    Going back to your sheet, they list the motor as 3/4 hp and then [559]

    MOTOR H.P. [W]– SPEEDS–TYPE 3/4 [559]-4-PSC (copied and pasted from the sheet)
    Thanks. Does that 559 hold even if it's on the low blower speed?

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