Water heater circuit requirement

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  #1  
Old 09-19-06, 08:27 AM
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Question Water heater circuit requirement

I have a Rheem 50 gal. dual element heater.
The spec. sheet says, "furnished with standard 240 volt AC, single phase non-simultaneous wiring, and 4500 watt upper and lower heating elements."
Would you translate to English please?
What is meant by "non-simultaneous" wiring?
Do I add the two 4500 watt elements (9000/240 = 37.5 amp) to get the breaker requirement or do I use 4500 / 240?
I have not seen any reference to amperage requirements yet.
I have not fully unboxed this heater since I am not ready to set it yet, I am preparing the mechanical closet in a new construction.
Thanks for the help.
 
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Old 09-19-06, 08:37 AM
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An electric water heater runs the top element until the water heats to temperature and the runs the bottom element until the weater heats to temperature.. Both elements do not run at the same time. That is what "non-simultaneous" means.
 
  #3  
Old 09-19-06, 08:46 AM
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Thumbs up much thanks

Thanks Racraft.

Unless you come back and say otherwise, I will do the 4500 / 240 = 18.75 amp., and install a 20 amp. circuit using 12/3 w/g?
 
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Old 09-19-06, 08:51 AM
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A water heater is a continous load. You must multiply the result amps by 1.25 to get the wire size.

Basicly, you need a 30 amp circuit with number 10 wire.
 
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Old 09-19-06, 02:50 PM
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Originally Posted by ramiron
... install a 20 amp. circuit using 12/3 w/g?
Like jwhite says, you'll use a 30A circuit and #10 wire, but you only need 10/2 w/ ground, not 10/3 w/ ground. There is no need for a neutral conductor, so remark (with tape or a Sharpie) the white wire as a red or black (or anything but green, white or gray) and use it as the second hot leg.
 
  #6  
Old 09-19-06, 06:57 PM
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Thumbs up

Thanks, I appreciate the help.
 
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