Description
The Resideo WT8840A1000/U Water Heater Gas Control Valve is a trade replacement natural gas valve designed for Bradford White® and A.O. Smith® standing pilot water heaters with 1″ insulation thickness. This integrated gas control regulates burner operation while maintaining accurate water temperature and safety shutdown protection.
Powered by a thermopile generated from the standing pilot flame, the WT8840 operates without external electrical power. The built-in NTC temperature sensor and temperature cut-off protection continuously monitor water temperature to ensure safe and reliable heater performance.
Designed as a direct replacement for Honeywell WV8840 series valves, this control restores proper heating operation in residential gas water heaters experiencing temperature regulation or gas control failure.
Features:
- Direct Replacement Gas Valve for Bradford White and A.O. Smith standing pilot water heaters
- Thermopile Powered Operation requires no external electrical connection
- Integrated Temperature Sensor provides accurate water temperature control
- Built-In Safety Shutoff protects against overheating conditions
- Replaces Honeywell WV8840 Series gas control valves for reliable restoration
Replaces Part Numbers:
- WV8840A1000
- WV8840A1001
- 222-47463-01 Series











