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Subject: water tank heater watage

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larryb    Posted 12-31-2017 at 12:53:21 [URL] [DELETE]        [Reply] [No Email]  
  • water tank heater watage
  • The old extension cord finally died out that goes from the barn to the outside water tank. The tank heater is rated at 1500 watts and 120v. Can a uf-b wire be used to carry the electric to the tank if I use 12-2 or uf-b 14-2 wire. Only a temporary use this winter till I get the new underground wires and outlets put in this summer. time and weather got to it.I been using a 12-2 orange extension cord for the past three years but time and weather got to it'

    Philny    Posted 12-31-2017 at 22:38:58 [URL] [DELETE]        [Reply] [Email]  
  • Re: water tank heater watage
  • Do you have 14-2uf already it would be ok out in open air ,but if you donít have any wire go with the 12 ga. Wire maybe put it on a gfi breaker

    steveVa    Posted 12-31-2017 at 19:57:30 [URL] [DELETE]        [Reply] [No Email]  
  • Re: water tank heater watage
  • How long does 5he wire need to run. If any length at all 14-2 is too small for 1500 watts and will overheat.

    J4nss(WNY)    Posted 12-31-2017 at 19:53:09 [URL] [DELETE]        [Reply] [No Email]  
  • Re: water tank heater watage
  • 1500 watts at 120 volt draws 12.5 amps. 12 ga is rated at 20 amps and 14 ga is rated at 15 amps. I wouldn't go over 100' with 14ga. With 12 ga you will have no problem. Most elements are rated for 120 and 240 volt. If you can run 240 volt your amperage cuts in half.

    Island Mike    Posted 12-31-2017 at 18:03:30 [URL] [DELETE]        [Reply] [Email]  
  • Re: water tank heater watage
  • I would think the heavier 12 gauge would be best. Also, grounding is critical. Horses in particular can detect stray electricity. Some sense it with their whiskers. Because they are so well grounded, a few stray amps can kill them. So whatever you do, make sure everything is well grounded. Even add an extra ground rod, and water it now and then if you are in a very dry area. I am not a sparky.
    The US made water heaters were much better than the Canadian made water heaters. Probably Chinese these days. I suggest buying the best. If an animal stops drinking because the water is too hot, or stray electricity is about, expensive vet bills can follow.

    Island Mike

    BlasterStumps    Posted 01-01-2018 at 09:49:58 [URL] [DELETE]        [Reply] [Email]  
  • Re: water tank heater watage
  • I've spent several long days working to find the cause of stray voltage in feed lots and dairies. It can be quite the mystery.
    I saw one situation where the cows wouldn't drink at the waterers because they were getting stray voltage. After about an hour of studying the dairy electrics, I took a chance of there being an underground fault on their cable running out to the waterer. Turns out I was right. Once I located the fault and it got repaired, no more stray voltage.
    Another one at a feed lot involved two grounds, one at the transformer pole and another at a remote building where the employees could shower. Using a megger on the grounds we determined a difference of potential that was traveling in the earth and was noticeable in the shower plumbing.

    Larryb    Posted 12-31-2017 at 22:48:21 [URL] [DELETE]        [Reply] [No Email]  
  • Re: water tank heater watage
  • I have not yet dug the trench for the underground cable so for now I am just going to have to lay it above the ground. It is just over 100 feet between the barn and the water tank with the heaters. I put a ground wire in the tank and clamped it to a ground stake. I was just planning to buy a extension cord for now to get thru the winter. Thank all of you.

    Jack - Iowa    Posted 01-01-2018 at 07:49:15 [URL] [DELETE]        [Reply] [Email]  
  • Re: water tank heater watage
  • According to the wire tables, 14 Ga. Copper has a resistance of 2.58 ohms per 1000 ft.

    Two,100 ft.14 gauge copper conductors would be .516 ohms. At the 12.5 amp draw of your heater that would result in a voltage loss of approximately 6.45 volts or 5.38%.

    For your distance 14 gauge would be fine.

    For the permanent wiring I also would use 12 gauge.

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