Question about Water Rheem MR40245 Marathon Electric Heater 40 Gal

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My mom has a RHEEM 40gal electric hot water heater...model 87H 40D 1PH, Serial # r0288003951. It is the table top version. She said that the hot water is no longer working and before I request a service tech come out, are there some simple thing s that I can check to determine if the unit will need to be replaced or if there is a simple solution to et her hot water again?

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First check that the thermostat is working im afraid if its not a fualt there the chances are its the element in theboiler that means a new boiler in most cases

Posted on Nov 13, 2009

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Posted on Jan 02, 2017


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I have a Rheem 62sv-40d electric water heater. What type of 4500W element do I need?

Rheem have their own spares site and web catalogue in the main link, but also here as well

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Nov 20, 2016 | Rheem Water Heaters

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Rheem 71 40d

Probably not. The wire and circuit breaker would both have to be upped in size. Then the thermostat's may not handle the extra amps. The higher watt element won't make the water any hotter, but will make the recovery of hot water faster.

Mar 04, 2014 | Water Heaters

1 Answer

Energy factor rating

Rheem 50 gallon Pro52-2 has EF .95, which makes it ordinary 240Volt 4500 watt non-simultaneous electric water heater that produces about 21 gallons hot water per hour, with 67 gallon first hour delivery.
Recommend 80 gallon per hour first hour for oversized bathtub.

Maintain electric water heater and it will last indefinitely.

Anode rod is located on top in separate port.
Anode keeps tank from rusting.

Year of Rheem water heater manufacture shows 3rd and 4th digit of serial number.

Nov 25, 2012 | Water Heaters

1 Answer

Were is cold water inlet and hot water outel on model 71-40d b

Cold inlet and hot outlet are marked on top of water heater.
Usually there is a letter or word embossed into the metal top.

If tank is connected, then turn on hot water tap for a few moment and feel which pipe is hot.

Cold water enters bottom of tank through dip tube located on cold side. If hot and cold are reversed, the water heater will not perform as expected.

Aug 05, 2012 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

2 Answers

My Rheem hot water heater is leaking, and I need to shut the water off, how and where do I do that? Model # 71/40D

Assuming this water heater is tank type..... Most plumbers will have a cutoff valve located at the water heater or they should have.... if there is not a valve there then the next option will be at water meter located outside or in basement depending on the area you live in......if you dwelling is supplied by a well then you may have a valve in next to the pump or determine what breaker supplies the power to well and turn it off.... ( this will take a little time for the pressure to drop low enough to actually slow the water leak) if the leak is on the tank then you must cut power off to the unit and remove unit or drain the tank to stop the water from spreading( if unit is an electric)

Apr 17, 2012 | Rheem Water Heaters

1 Answer

No hot water at all but power to all elements and to thermostats is there a dip tube in the rheem model 71-40D

Water heater can test for 120V power on elements and thermostats at all times.
That's because thermostats turn off one leg of 240Volt circuit, and not both legs.
You mentioned thermostats and elements, implying two elements and two thermostats, so your water heater is 240Volt.
240Volt breaker might be bad on one leg.
Open following links to troubleshoot

Yes the water heater has a dip tube.

Jul 10, 2011 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Rheem 40gal. electric: have 220 power at both elements at the same time but only one drawing is correct?

A 220 volt circuit does not require a neutral, so both 110v legs go to each element. The elements draw from each of these 100v legs. Are you having any problems with it heating sufficiently?

Dec 09, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Rheem warrior glass serial num-rh1098154699 model num-71-40d b That is all the information i collected off my hot water heater we have no hot water at all and i dont know how to fix this problem...

The label would also say if water heater is gas of electric.
That would be helpful information that could lead to troubleshooting.
Serial number tells us water heater was made on Nov 1998, which tells us the manual will not be on the Rheem website.

So if you have electric water heater, and no hot water.
There can be 4 causes.
1) Circuit breaker is not delivering 240 to water heater. Test top two screws on upper thermostat to see if tank has 240V.
2) ECO red reset button is tripped. Open top cover on tank and push reset button.
3) Upper thermostat is bad. Replace thermostat.

Nov 24, 2010 | Water Heaters

2 Answers

Not heating water hot enough or as much water.

You probably have a bad heating element. Probably the upper element.

Feb 03, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

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