Question about Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm

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Rheem 71 30d

I have a Raheem 71 30d hot water heater, the water is extremely hot and I have turned both theta stats down as low as it can go. Every time I turn the hot water on it spits because it has so much air in it. The overflow valve is constantly overflowing and it stays wet under my manufactured home. Help

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  • Mellony
    Mellony Oct 10, 2013

    It's not a tankless water heater



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  • Rheem Master
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You should be able to control hot water temperature by adjusting the thermostats. Either or both may have failed, causing heating to increase to the maximum. The "spitting" is caused by boiling water. Likewise, the pressure relief valve is operating as it should resulting in the overflow you observe. You need to get your heater serviced immediately!!

Posted on Oct 10, 2013

Testimonial: "Thanks. So we probably need to replace both thermostats?"

  • Mellony
    Mellony Oct 10, 2013

    We have a repair guy coming.


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  • 1 Answer

Over heating possible bad gas control valve , relief valve bad or water pressure too high or overheating will cause it to leak also lack of thermal expansion tank

Posted on Oct 18, 2013


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 2692 Answers

SOURCE: Hot Water Overflow

Do you have an expansion tank tank  in the line leading into water heater? If not what is happening is that the water is no longer allowed to go back into the city supply.  You said that you had turned it off while you left so the water heats up and has no place to go so the preasure/ temperature P/T valve  opens and lets out the excess water from the expanded supply (heater water) that has no where else to go. It used to be that the extra expanded water just backed up into the supply pipe and back into the main. That is no longer possible in most places by the  National Plumbing code.    The answer may be to install the expansion tank into the incoming line. You can see then now at  all hardware stores where water heaters are sold.

Posted on Jan 04, 2009

  • 268 Answers

SOURCE: have a rheem gas water heater for manufactured

First off, the repair man is right that it is the thermostat.I'm guessing his quote was the cost of part and labor to install it. You can buy a new one for around $300. to $350. ish.
Hope this helps.

Posted on Aug 14, 2009

  • 102 Answers

SOURCE: Rheem hot water heater problem

If by the hot water over flow valve you are refering to the T&P valve. It is activated by high temp. or high pressure. It is possible that when you flushed the lines it caused this to open. It is also common for these once open to get a little debris in them and cause them to continue to leak. Sometimes you can open and close them a few times and get them to reseal. Other times you have to replace them. Hope this helps.

Posted on May 10, 2010

  • 102 Answers

SOURCE: no hot water

If you checked the reset, then the next thing to check would be the breaker in your breaker box. If that doesnt work start checking the elements. The reset, the thermostat and the elements are pretty much all that can go wrong with an electric water heater, short of a leaky tank or faulty t&p valve. Hope this helps.

Posted on May 11, 2010

  • 760 Answers

SOURCE: I have a Rheem Steller natural gas hot water

Yes, Turn the knob on the gas valve to off. Turn off the incoming water line into the water heater. If you have a valve on the outlet turn it off too. Open the drain at the bottom of the heater to drain a little water from heater. You can then lift the lever on the temperature/pressusre relief valve to let a little air in to release the vacuum and let the tank drain. If the relief is in the side let it drain a bit longer so the water level is below the outlet. Be sure to re-install the down pipe on the relief valve on the new valve. You should drain the a few gallons of water at least once a year from your heater, and you should exercise your temperature relief valve once a year to be sure it will function. If your new valve leaks suspect your temperature control allowing the water to get too hot.

Posted on Oct 04, 2010

Testimonial: "thanks greatly"

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people are saying the lower element is bad,this I know the lower element cant have anything to do with it.possibly the thermostat Ive seen a problem if you would have an energy blanket around it this sometimes goofs up the thermostat.Id have it looked at,if the relief valve isn't going off have that checked to.water that hot isn't good relief valve is set at 150lbs

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