80 gallon tank what is the voltage and how do i hook electric wires to it

Anon, It would only work if that was meant to be hooked up that way. Check the specifications in the manual or the plate on the heater itself. Check the attached links,instruction and guides, 1st link shows typical wire hook up on both 120 and 240 v. Good luck .
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You probably need commercial 150gallon gas water heater.
Or three 80 gallon tanks, depending on number of people.

80 gallon residential gas heater is rated for low-demand 6-8 person household.
80 gallon residential electric is rated for low-demand 5 person household

80 gallon is not correct for 14-28 people in 7 apartments
http://waterheatertimer.org/Whatsize2.html
http://waterheatertimer.org/Two-water-heaters.html

Call local plumber, or local code department.

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

Are you sure its burnt out? Most of the time its the thermostat. If its burnt out then just change the element. To do that all ya do is shut off the power to the heater drain the tank unhook the two wires on the element and unscrew the element and replace it with a new one. You can get new ones at lowes or home depot. Its usually the bottom that goes out first.

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.
http://bostonheatingsupply.com/Rheem/Rheem%20Residential%20Electric/Professional/Rheem_ResidentialElectric_Professional%20Spec%20Sheet.pdf

Maintain electric water heater and it will last indefinitely.
http://waterheatertimer.org/How-to-maintain-water-heater.html
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html

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.

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

large water heater, turn p the themo stat to a higher setting ( watch for burns with young childern and older folks)

or the best install a tempering valve. this valve mixs hot water with cold water before it goes into the building.

Again if you have young ones or old people they can burn faster than any other group.the best is a larger heater for the DIY person.

Thanks Tom

Check all wiring at water heater and possible upper thermostat is bad, and in need of replacement.

I don't know that model number.
Tank-type water heater elements are located behind panels on side of tank.

Open following link to help troubleshoot electric water heater problems:
http://waterheatertimer.org/How-to-troubleshoot-electric-water-heater.html

The water heater label also shows element wattage, brand, voltage, serial number, and type of operation.
For example 5500W elements, non-simultaneous, 240V are typical ratings found on water heater.
5500 Watt would be replacement element size.
Non-simultaneous would indicate that both upper and lower element are not turned ON at same time.
240Volt is typical voltage for water heaters.
Serial number carries date-of-manufacture, based on brand.
For common brands:
http://waterheatertimer.org/pdf/WaterHeaterSerialNumberDecoder.pdf

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
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.

Call an electrician. you have hooked up wiring wrong

The wattage of the heating elements will determine the amperage you need. Take the total wattage of all the elements and divide it by the voltage you are using (probably 220). That will give you the amperage. Example: 4400 watts divided by 220 volts equals 20 amps.

DO YOU HAVE A MANUAL FOR AN 80 GALLON
ENERGY SMART ELECTRIC WATER HEATER?
THE MODEL # IS EE3Z80HD055V
I HOOKED EVERYTHING UP, THE GREEN LIGHT IS ON BUT I DONT HAVE HOT WATER YET.