High Limit Aquastat Controller, 100-180°F Range, 5°F Differential Zoom

High Limit Aquastat Controller, 100-180°F Range, 5°F Differential


Brand: Honeywell

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Application: High Limit
Bulb Size: 3/8"
Capillary Length: 39"
Switch Action: Contacts Break on Temp Rise
Temperature Range (F): 100°F to 180°F
Electrical Rating: 2A max @ 24 Vac
Max Temp Differential: 5°F
Max Ambient Temp (°F): Maximum Tank: 210 F
Height: 5-5/8"
Width: 2"
Depth (Inches): 2-1/8"
Mount: Immersion Well
Temperature Rating: Energy Cutoff: 200°F

Description for Honeywell L8100B1128

L8100A,B, and C are immersion type controllers for regulating and limiting the tank temperature in water heaters. As the water temperature rises past the setpoint, the controller switches off the gas valve.


  • Regulates temperature and provides energy cutoff (ECO) action on a temperature rise past the setpoint.
  • Includes a second sensing element that senses average water temperature to minimize stacking.
  • Fluid-filled element operates Micro Switch? SPST snap-acting switch.
  • ECO switch interrupts the thermocouple circuit or main valve before tank reaches 210 F (99 C) maximum temperature.
  • Includes factory-installed immersion well on controller.
  • Internal adjustment screw.
  • Special switch terminal provides three-wire hookup from Aquastat® controller to gas valve.

Additional Specs:
  • Insulation Depth: 1-1/2 in.
  • Bulb Size: 3/8 in.
  • Capillary Length: 39 in.
  • Switching Action: SPST, contacts break on temperature rise.
  • Electrical Ratings (millivolt): 2A maximum at 24 Vac.
  • Differential Temperature (F) Controller: 5 F, fixed.
  • Energy Cutoff Switch: 20 F, fixed.
  • Maximum Ambient Temperature (F) Maximum Tank: 210F
  • Temperature Rating (ECO) Energy Cutoff: 200 F
  • Mounting: Immersion Well

High Limit Aquastat Controller, 100-180°F Range, 5°F Differential

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