How to rewire electric water heater
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Upper and lower thermostats
thermostat temperature range
Buy residential upper and lower thermostats

Thermostats are interchangeable/ each works with your water heater
89T is discontinued/ replace with Apcom or Therm-o-disc
Buy 90-150° F for residential tank:
Rheem UV11698
Rheem SP11698
Camco 08163
Aprom / 110-160°
Water heater thermostats at Amazon
Camco thermostats at Amazon
More thermostats
Commercial water heater thermostatsBuy commercial upper and lower thermostats
Buy commercial thermostat 120-180 degree F
Rheem SP8293 / 170°
Camco 08304 / 180°
Rheem SP8295 / 170°
Camco 08314 / 180°
Resource
Read more about 3-phase water heater

Residential tank thermostat is rated 90-160° F
Residential tank is NOT rated for pressure and temperature of 170-180° water.
Only use 180 F thermostat on commercial water heater that is rated for high temperature
Only use 180° F thermostat on commercial water heater that is rated for high temperature

Marathon water heater is rated 170° F
Thermostat for 3-phase non-balanced water heaters up to 480 Volt
Resource
How to change 3-phase water heater to single phase
Rewire electric water heater How to change wiring on electric water heater / foam-insulated tank
Rewire foam insulated  tank
The foam fits very tight against wire so wires cannot be replaced.

Start with 3/8" standard drill bit to drill through steel top.
Then use 36" drill bit to drill through foam
Drill through top of tank near wiring cavities
Keep drill bit near outer edge of tank shell

Buy
36" drill bits
Fish bit
water heater thermostat Take photo of wires ... before starting
>Take photo of wires or draw picture showing location of each wire

See larger
Illustration shows typical residential non-simultaneoius 2-element tank wiring

Water heaters can be wired different ways:

Below are links for specific types of wiring and other actions you can take to alter water heater wiring
How to wire water heater thermostats:
How to wire off-peak water heater thermostats
How to wire simultaneous elements
How to wire redundant water heater
3-phase water heater thermostats
Convert 3-phase to single phase

How to wire two water heaters
How to add pilot light indicators to water heater
How to add another thermostat to electric water heater

How to replace thermostats
How to replace elements
How to test elements

How to select right wire and breaker
Wiring for two water heaters 2 ordinary residential non-simultaneous water heaters on one 30 amp wire and breaker
Wiring illustration
Applies to electric water heaters only

Important: install upper thermostat in place of Lower thermostat
This will give ECO protection to lower thermostat
You want to heat tank #1 first... and then tank #2
Or you can wire each one separately using 2 separate circuit breakers and 10 gauge wires

Buy
36" drill bits

Resources:
How to wire two water heater
How to install water heater thermostats
Add another thermostat to water heater
How electric water heaters work
Whirlpool energy smart Resources for rewiring Energy Smart
How to convert energy smart to regular water heater
3 phase non-simultaneous water heater
Larger image
Resources for rewiring 3-phase
How to convert 3-phase water heater to regular water heater
Compare 16 ways to control gas and electric water heater
circuit breaker resources Circuit breaker resources
Water heater is tripping breaker
How to replace circuit breaker
How to wire gfci
Can AC breaker be used for DC breaker
How to reset circuit breaker
Not enough space for circuit breakers/ use tandem
Circuit breakers
How to install subpanel
Why you need ground wire
See inside breaker box
How to wire safety switch
How to wire whole house surge protector
Figure volts amps and watts
Figure correct wire and breaker
Types of surge protection
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