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| Calc Electric Tank Standby Losses | Rate Topic |
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| Posted: Wed Jul 28th, 2010 06:29 am |
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1st Post |
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mo1258 Member
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Does anyone know how to calculate the standby losses on an electric tank water heater? I would think manufacturers would publish this data but I can't find it anywhere. Here's one suggested estimate but it seems to yield very low costs so I am skeptical that it is accurate: Assume indoor tank with 72 degree ambient room temp, no flows in or out .93 Energy factor = 236K WH per year @ $0.10 = $24 per year .94 Energy factor = 189 KWH per year @ $0.10 = $19 per year Your thoughts? Thanks!
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| Posted: Wed Jul 28th, 2010 06:52 am |
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2nd Post |
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eleent Member 
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Hello: The Energy Guide label on a heater gives info on heaters and their energy use. See: http://www.consumerenergycenter.org/home/appliances/waterheaters.html One way to think of it is if a heater costs, say $200/year to operate according to the Guide and it has an Energy Factor of .93 that suggests (to me anyway) that 7% of the $200 (or $14) was lost. A more accurate and difficult way would be to clock the energy used by the heater over a 24 or 48 hour period with no hot water usage. The KWHs will be higher as there is plumbing attached, or lower if the room the heater lives in is warm  Yours, Larry
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| Posted: Mon Aug 2nd, 2010 03:57 pm |
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3rd Post |
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mo1258 Member
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Thanks for your reply to my post about Standby Losses. It is striking to me how "cheap" the losses are with a high efficiency electric.
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