Page 1 of 4 1234 LastLast
Results 1 to 10 of 33
  1. #1
    Gold Member
    Join Date
    Aug 2007
    Posts
    339
    Location
    FL panhandle
    Tractor
    Yanmar 2210D

    Default Saving electricity

    Guys, How long do you think an Electric H20 Heater needs to be turned off in order to save electricity. Obviously, I know if you go on vacation, there's no point in leaving the heater on. But is there any efficiency in turning it off for 8 hours - Or are your savings lost when you heat the water back up?

  2. #2
    Epic Contributor Bird's Avatar
    Join Date
    Mar 2000
    Posts
    37,619
    Location
    Texas

    Default Re: Saving electricity

    Quote Originally Posted by rgood View Post
    Guys, How long do you think an Electric H20 Heater needs to be turned off in order to save electricity. Obviously, I know if you go on vacation, there's no point in leaving the heater on. But is there any efficiency in turning it off for 8 hours - Or are your savings lost when you heat the water back up?
    An interesting question. I never turn ours off unless I am turning off the water to the house. Am I wasting electricity? I don't know.
    Bird

  3. #3
    Epic Contributor MossRoad's Avatar
    Join Date
    Aug 2001
    Posts
    23,780
    Location
    South Bend, Indiana (near)
    Tractor
    Power Trac PT425 2001 Model Year

    Default Re: Saving electricity

    Quote Originally Posted by rgood View Post
    Guys, How long do you think an Electric H20 Heater needs to be turned off in order to save electricity. Obviously, I know if you go on vacation, there's no point in leaving the heater on. But is there any efficiency in turning it off for 8 hours - Or are your savings lost when you heat the water back up?
    I think a water heater blanket for an electric water heater will save more $ over an 8 hour time span than turning it off and no blanket.
    MossRoad

    Click On My Little Tractor
    To See Pictures And Videos
    Of It In Action!!!


  4. #4
    Super Star Member Egon's Avatar
    Join Date
    Aug 2001
    Posts
    17,732
    Location
    Nova Scotia, Canada

    Default Re: Saving electricity

    If you are living in a cold area and the heat emanating from the water heater goes toward heating the house would it be considered a heat loss during the heating season?
    Egon
    50 years behind the times
    Livin in a
    Worn out skin bag filled with rattlin bones

  5. #5
    Elite Member
    Join Date
    Mar 2005
    Posts
    2,614
    Location
    Bedford, VA
    Tractor
    John Deere 2320

    Default Re: Saving electricity

    That is a good question.. I bet the only way to really get a good idea is to put one of the kilowatt meters on it and record usage for a few days.. If you find out it runs quite a bit between say 9am and 4pm OR 9pm and 5am (when hot water usage is probably pretty low) then you can calculate and see if you can save anything

    Brian
    Bedford, VA
    2320 w/ 62D MMM, 200CX FEL, Pats EZ Change, LX4 Cutter
    Co-owner (with my father) of John Deere 790, 30 HP, 4x4, 513 cutter, 70 FEL
    2012 Nissan Xterra Pro-4x

  6. #6
    Elite Member
    Join Date
    Mar 2005
    Posts
    2,614
    Location
    Bedford, VA
    Tractor
    John Deere 2320

    Default Re: Saving electricity

    edited - double tap somehow
    Bedford, VA
    2320 w/ 62D MMM, 200CX FEL, Pats EZ Change, LX4 Cutter
    Co-owner (with my father) of John Deere 790, 30 HP, 4x4, 513 cutter, 70 FEL
    2012 Nissan Xterra Pro-4x

  7. #7
    Super Member Highbeam's Avatar
    Join Date
    Feb 2005
    Posts
    5,039
    Location
    South Puget Sound, WA
    Tractor
    Kioti CK30HST

    Default Re: Saving electricity

    Kill-a-watts work on 100 volt appliances only. Maybe spend a month manually flipping the breaker off at night and check your bill.
    Kioti CK30HST, FEL w/toothbar, 60" RC, 60" BB, PJ 10k trailer. Weekend warrior hauling 50 miles each way.

  8. #8
    Gold Member
    Join Date
    Aug 2007
    Posts
    339
    Location
    FL panhandle
    Tractor
    Yanmar 2210D

    Default Re: Saving electricity

    I would think that if I had a pan of water on the stove and maintained that at 120 for 8 hours, that would take more energy then heating it from from cold when I needed it - But I don't know the details on hot water heaters.

  9. #9
    Elite Member RonMar's Avatar
    Join Date
    May 2005
    Posts
    2,760
    Location
    Port Angeles WA
    Tractor
    Jinma 284 delivered 06/28/05

    Default Re: Saving electricity

    I would say it probably has to be off quite a while. Some tank heat loss tables I have used for other calculations say a steel tank with 1" of insulation, filled with 120F water in 60F still air will loose about 25 BTU per SQ/FT per hour. A 50 gallon water tank has about 21.3 SQ/FT of surface area, so that is about 532 BTU of heat loss per hour. It takes 4000 BTU of loss to drop the tank temp on 400# of water 10F. So the tank would probably only be down about 10F in 8 hours. An electric heating element delivers about 3413 BTU per KW per hour, so a standard 4.5KW heating element would heat at a rate of 15,359 BTU, which would put the tank back up to 120F in about 15 minutes, at a cost of around 1 KW hour(multiply by your local power rate). If you use hot water in the morning and the tank warms to shutoff temp, it probably dosn't run again all day unless it is in a drafty unheated basement space. Most tanks also have more than 1 inch of insulation around them, and more is better in this case.

    It should take about 1.56 hours for the 4500W element to heat a tank from 60F to 120F. That is a little over 7KW hours of energy(again multiply by your local rate). If your power rate is say 10 cents per KW/HR, then it would take 70cents to heat that tank of water from 60F to 120F. If not being used, and the tank only re-heats say 2.5 times a day at 10 cents per re-heat, you would have to turn it off for about 3 days to equal that 70cents to fully re-heat a tank that has cooled to room temperature. Under the above conditions, I would guess that any day after 3 days, you are saving about 25 cents per day... These numbers are very rough, so YMMV.
    Ron

  10. #10
    Platinum Member
    Join Date
    Jun 2007
    Posts
    646
    Location
    The real central PA everything else is philly or pittsburgh
    Tractor
    DK45 SE HST

    Default Re: Saving electricity

    Quote Originally Posted by rgood View Post
    Guys, How long do you think an Electric H20 Heater needs to be turned off in order to save electricity. Obviously, I know if you go on vacation, there's no point in leaving the heater on. But is there any efficiency in turning it off for 8 hours - Or are your savings lost when you heat the water back up?

    I won't qoute you any specifics, because I have none to give you. My grandfather (plumber) and my brother (plumber) both have taught me to wrap my pipes, wrap my heater, and install a little gray box, water heater timer. It isn't how long it needs to be off to save money, it really is how much are you paying to heat water 24 hours a day 7 days a week. The avg heater will kick on and off (depending on all sorts of variables) all day constantly heating the water to the same temperature whether you use it or not.

    I heat my water twice a day, all year long. It has a manual override, so when I have company over and they take 30 minute showers I can turn the water heater on ...or off (depending on whether or not I care for the person).

    I heat my water for 4 hours in the morning (wife and I hit the shower at different times), and for four hours at night. I set mine up to come on about 30 minutes before our day begins, and to shut off about and hour after we normally leave for work. I have it set to turn on about the time I leave from work to go home. We rarely use all the water, or the water gets cold. If it does, about 10 minutes will get you a new hot tank.

    Wiring it up is easy, as you will already have electric running to an electric one.

    Don't know if this long winded diatribe has helped or not.

    Hee is a link so you can see what I am talking about. You can buy other versions of this if you choose. I also think you can get a better price than the one offered here. I just pasted this link cause it was the first one I opened with a pic. http://www.science-city.com/ligrboxinmow.html
    Last edited by PA hayseed; 03-06-2009 at 09:36 PM. Reason: added link
    DK45 SE HST, RFM, BB, FEL, PHD, toothbar,rear blade, canopy, pallet forks, 6' tiller, and now I need an addition on my pole building

Page 1 of 4 1234 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
© 2014 TractorByNet.com. TractorByNet is a registered trademark of IMC Digital Universe, Inc. Other trademarks on this page are the property of their respective owners.