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Can you install 180 degree thermostat on water heater
Commercial/ high temperature thermostats
Rheem SP8294 Rheem SP8294 for 1 element tank
SP8293
Therm-o-disc 59T SPST

Commercial thermostat
Temperature range exceeds residential tank
Controls 1 element 
Use for commercial simultaneous water heater
Use for non-balanced 3-phase or single-phase 208, 240, 277, 480 Volt

Minimum temperature 110°
Maximum 170°
High Limit trips at 190°
Thermostat differential 17-27°F
All values +/- 5

Buy:
Rheem SP8294
Rheem SP8293 Rheem SP8293 for 2-element tank
Therm-o-disc 08304/ 59T SPDT

Commercial thermostat
Temperature range exceeds residential tank
Upper thermostat 
Use for commercial non-simultaneous water heater
Use for non-balanced 3-phase or single-phase 208, 240, 277, 480 Volt

Minimum temperature 110°
Maximum 170°
High Limit trips at 190°
Thermostat differential 17-27°F
All values +/- 5

Buy:
Rheem SP8293 / 170°
Camco 08304 / 180°
Rheem SP8295 Rheem SP8295: lower thermostat for 2-element tank
Therm-o-disc 08314/ 59T SPST

Commercial thermostat
Temperature range exceeds residential tank
Controls 1 element 
Use for lower thermostat on non-simultaneous commercial water heater
Use for non-balanced 3-phase or single-phase 208, 240, 277, 480 Volt

Minimum temperature 110°
Maximum 170°
High Limit trips at 190°
Thermostat differential 17-27°F
All values +/- 5

Buy:
Rheem SP8295 / 170°
Camco 08314 / 180°
Yes the 170°-180° commercial thermostat will fit the residential tank, but 180° scald is potential fatal injury ....
Keep in mind:
-Installing the 180° thermostat on residntial tank with 150° thermostats will void product warranty because the tank is not specified for that rating.
-150° is maximum rating for your water heater... due to tank strength
-Residential TP valve will release water at 170°F
-Typical bath temperature is 104-110°F and rarely higher
-Higher tempoeratures cause water to expand, same as ocean expands as it warms. The expansion increases pressure inside the task and on adjoining pipes and fittings. If tank is rusted or compromised in any way, the tank could rupture explosively. The flood of 180°F water would induce inflicting fatal burns.
safety chart
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How to adjust temperature on water heaters

180° scald is potential fatal injury
scald chart
Upper and lower thermostats
thermostat temperature range
Buy residential upper and lower thermostats
Thermostats are interchangeable/ each works with your water heater
Temperature range 90-150° Therm-o-disc/ reset trip @ 170°
Temperature range 110-160° Apcom/ reset trip @ 180°
Local YMCA hot tub = temperature 105°/...  Typical shower-bath = 110°F
Rated 120, 208, 277, 480 volt AC
89T is discontinued/ replace with Apcom or Therm-o-disc
Buy 90-150 degree F for residential tank:
Rheem UV11698
Rheem SP11698
Camco 08163
Aprom / 110-160°
Water heater thermostats at Amazon
Camco thermostats at Amazon
More thermostats

Resources:
Therm-o-disc 59T-66T sell sheet/ pdf
Therm-o-disc thermostats

Difference between Rheem thermostats
Commercial water heater thermostats
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

Marathon water heater is rated 170 degrees F
Commercial upper and lower thermostats
Commercial thermostats are used for 3-phase balanced and other commercial heaters rated for high temperature.
Residential water heater TP valve will release water at 170°
Buy/ 3 phase water heater thermostat 120-180 degree F
Upper thermostat
Rheem SP8293 thermostat 110° to 170°
Camco 120°F to 180°F

Lower thermostat
Rheem SP8295 lower 110° to 170°
Camco 120° to 180°F lower

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