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Difference between Rheem UV11699 and SP11699
Same ... both are upper thermostats.

UV = Universal Parts fit all brands water heater
SP = Preferred parts are same or similar to UV
Local YMCA hot tub = temperature 105°/
 Typical shower-bath = 110°F
UV11699 upper thermostat UV11699
SP11699
Controls 1 element
For water heaters with 1 element or for tanks rewired for simultaneous
Resource:
How water heater thermostats work

Minimum temperature 90°
Maximum 150°
High Limit trips at 170°
All values +/- 5

Standard Therm-O-Disc Upper Thermostat

One  element 208, 240, 277, 480 volt
Buy:
Rheem therm-o-disc UV11699
Rheem therm-o-disc SP11699
Camco Apcom style single element 07843 / 90-150°
Camco therm-o-disc single element 08143/ 90-150°
SP213600
SP213590
SP310230
SP11234
SP11231
UV11698 UV11698
SP11698
Upper thermostat for non-simultaneous 2-element water heaters
Typical residential water heater is non-simultaneous 2-element tank
Use this one for ordinary residential water heater
-Use on single phase water heaters, non-balanced 3-phase, and some 3-phase water heaters
Resources:
How water heater works
Figure volts amps watts
3-phase water heaters
Difference single-phase and 3-phase

Minimum temperature 90°
Maximum 150°
High Limit trips at 170°
Thermostat differential 17-27°F
All values +/- 5

Standard Therm-O-Disc Upper Thermostat
- Two element simultaneous 208, 240, 277, 480 volt
Buy:
Rheem UV11698
Rheem SP11698
Camco 08163
Camco Aprom 07863
SP210245
High Limit Setting (F): 170. High Limit Tolerance (F): +/- 5. High Limit Contact Configuration: DPST. Thermostat Adjustment Range (F): 80 to 140. Thermostat Tolerance (F): +/- 5. . Thermostat Contact Configuration: SPDT.
Upper Thermostats Difference between 1-element / 2-element thermostat
Upper thermostat for non-simultaneous dual-element tank has 3 screws on right side.
Thermostat for simultaneous single-element tank has 2 screws on right side.
Dual element thermostat will work in place of single-element, but single-element thermostat will not work for dual.

All dual-element and single-element thermostats works on 120V / 208-240V/ 277V / 480V etc
All thermostats are generic and can be used in place of each other... except you cannot use single for dual
Upper thermostats have ECO reset button that trips when temperature reaches 170°
UV11699 upper thermostat UV11700
For 120 volt water heaters with 1 element
Note... there are no screws on right side of thermostat
Use for 120 volt only, unsafe for 240 volt water heaters
Resource:
How to wire under counter water heater

Minimum temperature 90°
Maximum 150°
High Limit trips at 170°
Thermostat differential 17-27°F
All values +/- 5

Standard Therm-O-Disc Upper Thermostat

One element simultaneous 120 volt
Buy:
Rheem UV11700
Rheem SP11700
Therm-o-disc 08013
UV11695 UV11695
SP310020
Lower thermostat for non-simultaneous 2-element water heaters
Use this one for ordinary residential water heater
Minimum temperature 90°
Maximum 150°
Thermostat differential 17-27°F
All values +/- 5

Standard Therm-O-Disc Lower Thermostat
208, 240, 277, 480 volt
Buy:
Rheem UV11695
Lower thermostats
Rheem SP11695
SP8295
Therm-o-disc 08123 or Camco 8123
Camco apcom style 07723 / 90°-150°
SP8295
Commercial/ high temperature thermostats
Rheem SP8294 Rheem SP8294
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





Rheem SP8293
Rheem SP8293
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
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 120° to 180°F lower
PID temperature controllerDigital controller... activated by temperature probe
Proportional Integral Dervative/ PID control
PID controller is activated by temperature-sensitive thermocouple or thermopile.
Use the PID to control any other circuit.
Best to use PID to control a contactor or relay instead of directly connecting load to PID
Use contactor or relay as shown in illustrations below
''Output actuator has a resolution of about 3%''.
So if temp setting on PID is 140° then actual temperature is 140° ±3% or 4.2° margin of error.

Using a separate contactor or relay that is rated for elements and motors allows millions operations without risk of overload and burnout of PID terminals.
Buy:
PID Temperature controllers
Digital temperature controller
30 amp contactors
Omron relay
Solid State Relay Board for Arduino

Resources:
Contactors
Select breaker and wire size
Example wiring for PID
PID
Buy:
PID Temperature controllers
Digital temperature controller
30 amp contactors

Solid State Relay Board for Arduino




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