Question about Rheem 40 GAL ELEC TALL Water Heater 6YR SC 82VH402

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Rheem 49 gal model #81V400 - hot water lasting only 5 minutes. What to do?

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Rheem warrior 40 gal warrior


You could start by seeing if the thermostat is wide open. Sounds like it is on low or vacay mode. How far is the run between your heater and the bathing area. Might need to insualet some piping.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

Sep 24, 2013 | Water Heaters

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Date of manufacture 81v400, serial r1194849014


1) Rheem 81V40 electric water heater ... manufactured pre 2009 ... posted serial number does not match manufacturer
http://waterheatertimer.org/pdf/Find-Age-of-water-heater.pdf
http://waterheatertimer.org/pdf/Rheem-Ruud-2009-water-heater-parts-by-model-number.pdf page 5

2) Possible date of manufacture 11-1994

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

Mar 05, 2013 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

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Rheem 49 gal model 81V400B - hot water lasting only 5-10 minutes then takes an hour to heat back up.


Ordinary tank-type electric water heaters are fully repairable by homeowner.

A) Basic info on Rheem
Rheem electric water heater website:
http://www.rheem.com/products/tank_water_heaters/electric_water_heaters/
Find age of Rheem: look 2nd and 3rd digit of serial number, for example 06 is 2006

B) Water heater has some hot water.
That says certain things: upper element is working, water heater electricity is working, reset button is not tripped, and heater is not experiencing run-away overheating event.
http://waterheatertimer.org/How-it-works.html

C) That leaves 4 suspects that cause lower amount of hot water.

1) TP valve is running hot water out of tank -or- leaking faucet is running hot water out of tank.
Check for leaks
http://waterheatertimer.org/How-to-replace-TP-valve.html

2) 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:
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

3) Burned or shorted wire located between upper and lower sections of tank.
Turn off power. Open covers on side of tank. Remove insulation. Inspect parts for signs of high heat and burning. Especially check 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.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Feb 03, 2011 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

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My husband replaced both elements on our water heater (model # 81V400) I'm not sure what he done but we had hot water for a day but now it isn't working again.he replaced the bottom one with a camco screw...


The tank has to be completely full of water before turning on electricity or elements will instantly burn out:
http://waterheatertimer.org/How-it-works.html

I would take 40 minutes and do complete troubleshoot before replacing anything else.
This requires $5 multimeter from home center.
Put battery in multimeter.
When testing voltage, rotate multimeter dial to 240-250-277VAC
When testing continuity and elements, rotate multimeter dial to Ohms
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

There are a lot of words on the page, but everything is simple and anybody can fix their own electric water heater.
After that, water heater is no longer a mystery and you can save money instead of ever calling service technician again.

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 30, 2011 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Which element do i need for a RHEEM 81V400 water heater?


Rheem bolt-in element is 4500 watt.
Buy at hardware store or plumbing supply.

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Nov 15, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

We have a Rheemglas Standard Electric Water Heater 81V400 B and it's leaking water from the tank and also the hot water only lasts for a short period of time. I've been reading and have read that the water...


if your water heater is leaking from the tank, and not around any fitting, then you will need to replace the heater.
you can flush the heater, once a year is always recommended, however once every 2 years is sufficient.

scale, and deposites inside the tank will cause erosion and eventually eat through the walls of the tank. not much you can do to prevent this. the steel in the new tanks just don't last like they ued to.

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

1 Answer

No hot water


I am afraid that you have burned the heating element out or an inline fuse is burned out

May 15, 2010 | Rheem 30 GAL ELEC SHORT Water Heater 6YR...

1 Answer

No hot water


Take these steps, ensure you are recieving correct voltage to the heater. If this has been confirmed, then using an ohmmeter, with the power turned off, check the resistance through you heaters. You should read a resistance through the heater(s). If you read OL, it means the heater is broken, and if you read 0 the heater is shorted. Hope this helps

Mar 29, 2010 | Rheem 30 GAL ELEC SHORT Water Heater 6YR...

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