I have a Rheem 50 gallon electic water heater that seems to be leaking from the on/off lever at the top of tank. Do you have a replacement part for the on/off lever? Thanks, Cindy

https://www.youtube.com/watch?v=u6w88TXMbg8

Tank has rusted out.
http://waterheatertimer.org/Leaking-water-heater.html
Replace with new tank:
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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

No.
Replace tank.
Buy 40 gallon from local Lowes and install yourself.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Under thin metal shell is a welded steel tank, surrounded by insulation and then covered with painted metal shell. The shell is what you look at.
The inside steel tank is made to withstand high pressure expansion that comes with heating water.
The steel tank has rusted out.
Turn gas control valve to vacation, so pilot light stays on, and then only heat enough water as needed until you can replace tank.

Prevent next tank from rusting by replacing anode rod, and ground water pipes.
http://waterheatertimer.org/How-to-maintain-water-heater.html

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

Water on top of gas heater can be caused by poor venting, or inadequate combustion.
Make sure water is not coming up from under tank top, indicating tank leak requiring tank replacement.
Have a plumber look at problem to make sure home is not filling with deadly, odorless CO gas.
Inspect pipes that they are not corroded and covered with condensate.
Check that roof cap is in place.
Let heater fire and burn for a few moments so the fire is going good, and then light match just outside the draft hood on top of heater. Blow out match and see if smoke draws immediately into vent and upward.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
http://waterheatertimer.org/Leaking-water-heater.html

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

You have a water leak coming out of side of tank?
Water heater must be replaced. It is rusted, and could rupture.
Inspect and replace anode rod to prevent rusted tank, so water heater will last longer.
http://waterheatertimer.org/Leaking-water-heater.html
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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

just turn off the gas valve for pilot light, turn off cold water to water tank. drain system. when refilling open cold water to fill tank, wait at least a 1/2 hour to 45 minutes then relight water heater. you should be fine!

82V52-2 is typical 240Volt 50-gallon electric water heater.
Water heater has to be full of water before turning on power.
This is true for gas and electric water heater.

Once water pipes are connected, you are ready to fill tank.
Turn on cold water shut-off so water enters tank.
Open bathtub spigot on hot side.
When tank is full, water comes out of tub spout full stream.
Let the water run until there is no more air coming out.
Next, open TP lever on water heater for a moment, and this will bleed out last pocket of air.
TP valve is located on upper part of tank, on the side or on top. It is a brass valve with silver-colored lever. Lift lever for a moment and water will exit tank down the overflow tube.
Water heater is full.
Turn on 240Volt circuit breaker going to water heater.

Other links with electric water heater information:
http://waterheatertimer.org/How-to-replace-water-heater-drain-valve.html
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html#cleanelectric
http://waterheatertimer.org/How-it-works.html

If it is leaking out the top it would be best to replace it. just check the fittings and make sure they are not leaking and running in the heater. Try to dry it up as much as possible if it is around any fittings.

But if you can see it's coming from the tank it would be best to replace because it will need replacing later even if it could be plugged temporary now.

If it is leaking from the tank, you'll have to replace the heater.

sounds like you have a hole in your tank or a leak on the connections at the top, might be a bad heater. if it's new call rheem and get it warrentied!