Where is the reset button on Rheem 71-305 water tank?

Question edited for clarity. Looks like you encountered autocorrect

The manual is here. It doesn't mention a reset button.

Rheem RETEX-27 instruction manual and user guide

https://mans.io > Rheem > Tankless Electric Water Heaters

Rheem RETEX-27 Performance 27 kw Self-Modulating 5.27 GPM Tankless Electric Water Heater download pdf instruction manual and user guide.

But this says it does, or may have?

Where Is the Reset Button on a Rheem Hot Water Heater? On Rheem water heaters, the reset button is usually a red button located near the thermostat, at the middle of the limit switch. To access it, you will need to remove the metal panel on the unit. The red button is behind the insulation.

How to Reset Rheem Tankless Water Heater - Quick Fix

tank-type electric water heater?
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html#reset

Gene

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if there is no reset button, you should be able to turn the breaker off for a few minutes. then turn it back on. if its an electric water heater! it should reset it. good-day !

Question posted under Rheem electric water heater.

1) ECO red reset button is on upper thermostat, located under upper cover on side of tank.
It is covered with insulation. See images:
http://waterheatertimer.org/images/water-heater-thermostat2.jpg
http://waterheatertimer.org/images/Jly-022-thermostat2-175.jpg

2) Be sure to put cover and insulation back in place after pushing in reset button.
3) Push button inward very firm.
4) If reset does not punch back in, then replace upper thermostat.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
5) Open following link for full troubleshoot resources:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

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For a price, expert works with you while you work on water heater or any do-it-yourself project.
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If you have tankless, then open following link before calling service technician.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

If you have ordinary tank-type electric water heater, then reset button is probably tripped out, or circuit breaker is not delivering power to heater.
Reset circuit breaker, then open cover located on side of tank and push in ECO red reset button.
http://waterheatertimer.org/How-to-troubleshoot-electric-water-heater.html
http://waterheatertimer.org/How-water-heater-thermostat-works.html

If you have boiler or indirect heater or solar heater or faucet-type heater, I would need more information, and might not be able to provide best answer.

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Fixya is always less expensive than a service call.

You posted under Rheem 81VP which is 6 gallon point of use electric water heater.
3 things can cause problems: Power going to water heater, thermostat with reset button, and 1500watt element.
Check that 120Volf circuit breaker is not tripped.
Open cover on side of tank and push in red reset button.

If reset button is not tripped out or will not reset, and water heater has power, then replace thermostat is best start point.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

Also test element, since elements burn out:
http://waterheatertimer.org/How-to-test-water-heater-element.html

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For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

1) Rheem 71-30 is 2-element electric water heater
Reset button is located behind upper panel located on side of tank.

2) Rheem no longer shows that exact model number so your tank is older.
To find age of water heater look at 2nd and 3rd digits of serial number, for example 06 is 2006

3) To download sample manual:
I recommend you read entire manual so it will save you money
http://www.rheem.com/product.aspx?id=91C402E4-D88A-4E32-BB5E-6D1A8D41FC37

4) This water heater is fully repairable by homeowner using generic parts from hardware store
To troubleshoot water heater: Requires $5 multimeter from Home center and about 45 minutes.
Repairs take from 40 minutes to 1 afternoon, depending on skill and problem.
Repairs cost $30-70
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.

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 shown 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 in case you need to buy new generic 4-bolt type 4500 Watt element from hardware store.

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) 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:
C) 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.

Rheem 4500 watt element

Electric water heater can be repaired by homeowner
If I understand correctly, water heater is producing no hot water.
Reset button clicks in, but still no heat.

Three initial things can be causing this:
1) No power to water heater. Test across top two screws on upper thermostat for 240V. Red and black wire are attached to these screws. Screws are marked 1 and 3. Upper thermostat is same that has reset button. If power tests 120 across screws, then breaker may be off on one leg. If no power, then start testing at breaker.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

2) Upper thermostat is bad. Replace thermostat with generic upper thermostat available at hardware store.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

3) Upper element is bad. Test and replace element using Rheem 4500 watt element available at hardware store. Image shown below. Look at label on side of tank for element wattage. Rheem puts 4500 watt elements into all their 240V electric water heaters.
http://waterheatertimer.org/How-to-test-water-heater-element.html

If upper element is burned out the tank will not heat any water.
http://waterheatertimer.org/How-it-works.html

Rheem 4500Watt element


Upper thermostats are generic and interchangeable:

TIME TO REPLACE TODAYS ARE MORE EFFICIENT