Honeywell WT8840B1000 Water Heater Gas Control Valve

Honeywell WT8840B1000 Water Heater Gas Control Valve

Regular price $129.00 $0.00 Unit price per

Condition: Like new. Outer box is missing but unit appears new & unused, complete with installation guide. Will ship in a generic box. Sold with our 30-day "no-hassle" return warranty.


The WT8840 Water Heater Control is designed for use in Standing Pilot applications using an immersion well for water temperature sensing. All models of WT8840 include an integrated NTC temperature sensor.

The WT8840 is powered from a thermopile heated by the standing pilot flame. CS8840 pilot assemblies are designed for use with this control.

The immersion well for sensing water temperature has matched NTC thermistor sensors. These sensors provide the fail-safe mechanism through which the WT8840 can provide both accurate water temperature control as well as water temperature limit (Temperature Cut-Out [TCO]) function.

  • Application: Gas control
  • Comments: 87C TCO
  • Mounting: Mounting in the upright position
  • Temperature Ratings (F): Ambient-- 32 F to 150 F (0-60C); TCO Limit-- 189 F (87C)
  • Setpoint Temperature Range (F): Valve-- 55F to 155F
  • Pressure Regulator Setting (psi): 5.0 in. wc
  • Inlet/Outlet Size (in.):1/2 in. NPT x 1/2 in. Inverted Flare
  • Capacity: Min. 30 ft3/hr, Max. 75ft3/hr
  • Replaces 87C TCO
  • Replaces WV8840B1042, WV8840B1109, WV8840B1110, 316910-000, 321166-000, 100112336. or 9007884005