Question about Rheem RUUD ELD40 Water Heater,electric,40 Gal,208v,4.5kw 3CFG6

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How to wire a rheem 40 gal electric hotwater heater with a yellow,blue, and Black wires

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  • Rheem Master
  • 5,089 Answers

Jan 2013
1) Water heaters can be wired many different ways.
Copy following link For ordinary household 240Volt water heater, the heater is wired for non-simultaneous operation:
http://waterheatertimer.org/images/WH-w-combined2-1000.jpg
Copy following link For other wiring diagrams, including off-peak, simultaneous, redundant, etc
http://waterheatertimer.org/How-to-wire-water-heater-thermostats.html

2) Make sure water heater circuit breaker and wire size matches watt rating that shows on end of each element.
http://waterheatertimer.org/Color-codewire.html

3) Non simultaneous means only 1 element is ON at a time.
So either upper element is ON, or lower element is ON, or both elements are OFF.
Both elements are never ON at same time.
So non-simultaneous water heater with two 4500 watt elements has total connected watt rating of 4500 watts. Because only 1 element can be ON at a time.
Use 30 amp breaker and 10 gauge wire.

Posted on Jan 20, 2013

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  • 40 Answers

SOURCE: 40 gallon rheem electric hotwaterheater, amps to

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Posted on Oct 30, 2009

  • 122 Answers

SOURCE: installed new rheem 40 gal

did you turn the power on BEFORE you filled it with water???

this is a pretty common mistake. you will need to check the upper element to make sure its working.
most water heaters have an upper and lower themostat. the upper thermostat is the one we need to check.

use your volt meter...

turn the power off, test with your volt meter to make sure! remove one wire from the element, not the thermostat, and check resistance on the element. if no resistance, you burned the element, and will need to replace it.
replace with same wattage, usually 4500watts. it will be written on the element.
also, I like to push the reset button on the thermostat to make sure it wasn't tripped.

Posted on Aug 31, 2010

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Hello,You are correct! Black/blue=black & Yellow=white 220volt single phase power.There are 3 wires for 3 phase power connection NOT the case in a home.Also an "off peak"timer option would use (black) only controlling the bottom element and (blue) controlling the top element.

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My hot water heater has a red and a black wire,but the electric supply wires coming in to power the water heater have a red,black white and a bare ground. Which wires go where?


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You will find two covers on the front.Behind each cover the you will find a thermostat ,there will be adail on it. It might be numbers like 120,150 or it might be letters,like A,B,C and so on.You take screw driver and turn to the right until you get the tempture you want.

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