Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm Logo
Posted on Oct 07, 2012
Answered by a Fixya Expert

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MY Rheem 81SV40D Water Heater (47 gal) does not heat enough water. Approximately one bath worth.

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Gene Haynes

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  • Rheem Master 5,391 Answers
  • Posted on Oct 08, 2012
Gene Haynes
Rheem Master
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Joined: May 07, 2012
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You have dual-element 240Volt electric water heater.
Since you have some hot water, then we know upper element is good, and that circuit breaker and electricity to water heater are good.
Not enough hot water is probably bad lower element, and possibly sediment build-up in bottom of tank.
Test element:
http://waterheatertimer.org/How-to-test-water-heater-element.html
Replace 4500 watt element available at local hardware, and clean out bottom of tank:
http://waterheatertimer.org/How-to-replace-water-heater-element.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

3 Related Answers

t1m130

t1m130

  • 86 Answers
  • Posted on Mar 15, 2009

SOURCE: Elec water heater

first turn the breaker off there should be two covers on the font of the heater if you r just looking for adjustments u can take those covers off and there is usually a foam piece behind the covers pull the foam off and there should be a dial to adjust it

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muttandjeff

Allen Neal

  • 359 Answers
  • Posted on Jan 05, 2010

SOURCE: My rheem water heater doesn't seem to be heating

try setting the bottom 10 degrees hoter than the top could be in short cycle (thatis the bottom calls for heat on the bottom element and set too close so goes back to top and cycles off

Peter Hampton

  • 193 Answers
  • Posted on Apr 21, 2010

SOURCE: Rheem 50 Gal two 4500W heating element - not enough hot water

one element is off peak and one is boost could be thermostat or ripple controller in fuse box or one dead element

Testimonial: "It is very good advice. I bought a tester to check out both upper and lowre thermostat and heating element; I've replaced the lower heating element "

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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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