Resideo WT8860B1000/U Water Heater Gas Control Valve
The Honeywell WT8840 Series Water Heater Control is a professional replacement gas control designed for trade use in compatible A. O. Smith and Bradford White water heaters originally equipped with WV8840 Series valves.
Designed for standing pilot applications, the WT8840 uses an immersion well and integrated NTC temperature sensor to accurately monitor water temperature inside the appliance. The sensor is capable of reading temperatures up to 221°F (105°C), providing dependable temperature control and improved system performance.
The WT8840 incorporates advanced diagnostic and safety features designed to simplify servicing, reduce callbacks, and improve water heater operation. An integrated status LED helps technicians quickly identify operating conditions, while the resettable emergency temperature cutoff can reduce the need for complete valve replacement following certain high-temperature events.
Key Features
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Replacement water heater gas control
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Designed to replace compatible WV8840 valves
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Suitable for A. O. Smith and Bradford White water heaters
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Designed for standing pilot applications
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Integrated NTC temperature sensor
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Temperature sensing up to 221°F (105°C)
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Status LED simplifies diagnostics and troubleshooting
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Resettable emergency temperature cutoff
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Larger pilot flame helps improve operating reliability
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Accurate water temperature sensing
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Anti-scalding algorithms for enhanced safety
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Immersion well temperature sensing
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Designed for professional trade applications
Applications
The Honeywell WT8840 Series is designed for:
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Residential gas water heaters
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Standing pilot water heaters
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A. O. Smith water heaters
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Bradford White water heaters
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WV8840 replacement applications
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Professional HVAC and plumbing repairs
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Water heater maintenance and servicing
Specifications
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Manufacturer: Honeywell
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Series: WT8840
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Product Type: Water Heater Gas Control
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Application: Gas Water Heater Control
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Pilot Type: Standing Pilot
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Temperature Sensor: Integrated NTC
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Maximum Sensor Reading: 221°F (105°C)
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Ambient Temperature Range: 32°F to 140°F (0°C to 60°C)
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TCO Limit: 189°F (87°C)
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Valve Setpoint Range: 55°F to 155°F
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Capacity: 30 ft³/hr minimum, 100 ft³/hr maximum
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Pressure Regulator Setting: 5.0 in. w.c.
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Inlet: 1/2-inch NPT
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Outlet: 1/2-inch Inverted Flare
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Mounting Position: Upright
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Door Sensor: Yes
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Certification: CSA
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Customer Application: A. O. Smith
Why Choose the Honeywell WT8840?
The Honeywell WT8840 provides a dependable replacement solution for compatible WV8840 water heater controls. Features such as integrated diagnostics, accurate temperature sensing, a resettable emergency temperature cutoff, and anti-scalding algorithms help improve safety while making troubleshooting and servicing easier for professional technicians.
Its compatibility with selected A. O. Smith and Bradford White water heaters makes the WT8840 a practical choice for professional water heater repair and maintenance applications.
