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Water gets cold to fast have a very old rheem electric water heater and have no idea to change so water stays hotter longer

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Hellol Vcja,

I understand that your hot water runs out to fast when you use it. You state that this is a very old unit. The cause of this is calcium build up, their is not enough space in the water tank for water. You are suppose to flush your tank at least once a year to reduce calcium build up. Over many years this gets bigger and bigger and eventually the tank does not heat water at all. I would suggest looking in to purchasing a new tank, as the scale in it is like a big stone and will not break up and flush out of the system.

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Justin

Posted on Apr 04, 2011

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What is causing electric tankless hot water heater to be needing red button reset often?


PDF]Tankless Electric (RTE) Troubleshooting - Rheem

www.rheem.com/docs/FetchDocument.aspx?ID=87d15e35-5adf-4e9f...
Tankless Electric (RTE) Troubleshooting. Technical Competence .... For four chamber units (RTE18 & 27) go to paragraph 4T. 9. Conduct OHMS resistance ...

Rheem RTE 27 Series ' Use and Care Manual

https://www.manualowl.com/m/Rheem/RTE-27-Series/Manual/296033
Rheem RTE 27 Series ' Use and Care Manual - Page 1. Use & Care Manual Electric Tankless With Installation Instructions for the Installer Water Heaters The ...

Sep 06, 2015 | Rheem RTE 27 Tankless Electric Water...

1 Answer

I have a Rheem 82V52-2 electric water heater that twice the cold water feed has plugged completly not allowing cold water in. Any idea what is causing this?


sounds like a corrosion issue if you went into the heater with a copper male adapter or an unlined galvanized or worse a black nipple . replace the connection with a dielectric union that separates the different metals this will also prelong the life of the heater

Dec 30, 2014 | Rheem 82V52-2 50 Gallon 240V Electric...

1 Answer

Runs out of hot water fast


Test elements, and if elements are good, replace both thermostats.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Rheem does not post service manuals.
If this is 3-phase balanced water heater, then information above is altered.
Otherwise parts are generic and testing steps are same

Mar 26, 2013 | Rheem ELD80 Commercial Electric Water...

1 Answer

How do you set tempature to make the water stay hotter longer? I have a Rheem 82v66 2 (65 gal) and cant fill my bath tub with out running out of hot water.


65 gallon water heater should fill more than 1 bathtub since typical bath only uses 12-14 gallons hot water. First hour delivery on your tank should be greater than 60 gallons.
http://waterheatertimer.org/Hot-water-use-chart.html

Since you have such a small amount of hot water, it sounds like bottom element is burned out, or one of the thermostats is bad. There are two thermostats, and two 4500 Watt elements on 65 gallon tank.
If upper element was burned out, or water heater was not getting 240V electricity, then you would have NO hot water. So we know upper element is good and circuit is good.

Ordinary tank-type electric water heater is fully repairable by homeowner and parts are available at hardware or home center.
I suggest taking 30 minutes and doing troubleshoot before replacing any parts.
Buy cheap multimeter from home center.
When testing voltage, rotate multimeter dial to 240-250-277 VAC
When testing elements or continuity, rotate dial to Ohms.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Add a comment for more free help. I can answer questions as you fix the water heater.
Also take advantage of fixya phone service.
For a price, fixya expert speaks with you over phone while you work on heater.

Jan 11, 2011 | Rheem 65 GAL ELEC Water Heater 6YR Self...

1 Answer

The water want stay hot very long


You have electric water heater.
Electric water heaters are fully repairable by homeowner, excluding hybrid type.

Rheem electric water heaters:
http://www.rheem.com/products/tank_water_heaters/electric_water_heaters/
Rheem fury series manuals and models
http://www.rheem.com/product.aspx?id=09DF2BDD-5E11-4D32-B574-84ACFB8A4619

Age of Rheem
water heater is first 4 digits of serial number located on side of tank: for example 0705 means July 2005.
Serial number also shows model number & wattage of elements.

A) If your water heater receives very cold incoming water, it may not heat fast enough to keep tank warm.
Add a tempering tank.
http://waterheatertimer.org/Tempering-tank.html
Add insulation over entire water heater except TP valve. Insulate pipes completely.
Read more information:
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html

B) If cold outside temperatures are not to blame, your water heater may have a bad thermostat or bad lower element.

C) 40 or 50 gallon water heater is 240Volts and tank will have 2 access panels on front.
Rheem ships all water heaters with 4500 Watt elements.

Narrow down the suspects:
D) Water heater has some hot water.
This tells us upper element is working.
And that water heater electricity is working.
And that reset button is not tripped.
And that heater is not experiencing run-away overheating event.

That gives us 3 solid suspects.
1) lower element is burned out. Test lower element using inexpensive multi-meter from Home Depot.
http://waterheatertimer.org/How-to-test-water-heater-element.html
Replace element with same wattage shown on label, and clean out sediment:
This will restore water heater to full 99% efficiency.
http://waterheatertimer.org/How-to-clean-sediment-out-of-electric-water-heater.html
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

2) Upper or lower thermostat is bad. Replace both thermostats for about $25.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
If you want to test thermostats and all parts before replacing anything:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

3) Burned or shorted wire. Turn off power. Open covers on side of tank. Remove insulation. Inspect parts for signs of high heat and burning. Especially lower element. Tighten any loose wires. Replace part that shows signs of burning.
Put insulation and cover back over thermostats so cooler outside temperature doesn't cause thermostat to misread tank temperature.
geno_3245_183.jpgRheem element

Dec 14, 2010 | Rheem 50 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

What is the minimum GPM's for a Rheem tanklers water heater to work? I can only run the shower by itself. Also can I install an outdoor tankless Rheem in an area where it gets down to -10 degrees F ?...


Rheem makes a number of tankless models
http://www.rheem.com/products/tankless_water_heaters/

They make a tankless 95 outdoor series
http://www.rheem.com/product.aspx?id=EBA80FAA-3C0F-411D-AF83-82061C28ED1B

The 95 outdoor series spec sheet says .4 GPM minimum activation and .26 GPM flow to keep burner activated. The colder the incoming water, fewer users can take a shower at once.
http://globalimageserver.com/fetchDocument.aspx?id=ea5f0816-dfd4-4bcf-a605-79945619f5bb
The .4 GPM and .26GPM numbers are fairly typical for tankless units.
These numbers are good when the unit is new.
After a few years the number may be different because the tankless is a high-tech machine with sensors that are susceptible to particulate in the water, and susceptible to perfect-functioning of other parts in the machine.
The outdoor series spec sheet says the tankless is good to minus 30 F.
But remember that's when the unit is new.
Outdoor tankless water heaters have an electric heater that keeps water pipes inside the unit from freezing, as long as electricity is ON.
If electricity goes off, the house stays warm inside for several hours.
But a steel box located outside would get cold immediately without electric heat.
The electric heater adds standby cost to operational expense.
The tankless has a heater, but you still have to protect the incoming and outgoing pipes.
If your incoming water is very cold, the tankless heater may not be able raise the temperature fast enough to give two showers -or- even 1 shower depending on age and efficiency and capacity.
You can add a tempering tank located in naturally warm area that passively pre-heats incoming water before it enters the tankless burner.
It might be best to locate tankless inside the house >> and use direct vent through the wall for both incoming air supply and outgoing vent gas.
If incoming air is taken directly from the living space, then tankless will draw air into the house through cracks and around doors.
A lack of sufficient air, or poor air quality can cause the burner to shut down.

When buying a tankless, read the spec sheets and really ask questions about everything you don't understand.

Oct 24, 2010 | Rheem RTG-53PVN Indoor Natural Gas...

1 Answer

Water is staying too hot after elements were changed


Usually heaters are wired so that the upper element comes on alone and only after it has reached it's set temperature does the bottom element come on. If wired incorrectly both elements come on at the same time. Could cause extra hot water in top of heater. If the temperature sensors are not right up against the metal of the heater they will run hotter then you have set. Since the new elements are now more efficient than the old ones they could be making more heat at the same setting you had before so lower the setting.

Sep 20, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Sounds like a squirrel inside water heater


Hi,
The noise is inherent in electric hot water heaters. It is the noise that the water makes when it is being heated by electric heating elements. Mineral buildup on the elements can make it worse, so changing the elements can help...but will not totally elimenate the noise. When I install a new tank and turn it on all I have to do is listen to it to see if it is working or not...even brand new will make a sound...it is the sound of hot water... :-)

heatman101

Mar 25, 2010 | Rheem 30 GAL ELEC SHORT Water Heater 6YR...

2 Answers

Water will not stay hot long enough to shower...not familiar with any of these thermal expansion tanks and can't find any info on vacuum relief valve---40 gal water heater is 18 months old....any...


Turn the gas knob up. There's a dial on the front (probably red) and it will have settings on it. A B and C. Turn up to desired temp, but be careful of faucets if there are children in the house. Good luck

Dec 30, 2009 | Rheem 40 Gallon FVR NATGAS Low WATER...

1 Answer

Rheem 50 gallon gas water heater less than one year old runs out of hot water almost immediately. They changed the thermostat and it worked for a few weeks then it stopped again. Any ideas?


it could also be the dip tube. this is a tube that is installed at the time the unit is made.it is a plastic tube that is on the cold intake side of the hot water heater.it may have fallen inside the unit or may not be in the unit at all check to see if there is a plastic tube this will help the heater stay hotter for a longer period of time. good luck with your project.

Sep 29, 2009 | Rheem 50 Gallon FVR NATGAS Water Heater...

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