Honeywell Reliance WT8840B Gas Control Valve — 1-inch Immersion-Well, 160°F, for AO Smith Water Heaters

Overview

The Honeywell Reliance WT8840B gas control valve is designed as a durable, trade-ready replacement for WV8840 valves on AO Smith water heaters. Built for standing-pilot installations, it relies on an immersion-well temperature-sensing approach to help regulate water temperature with steady, predictable control.

Crafted in the United States by Honeywell, this valve aligns with established heating systems and is intended to fit a 1-inch cavity profile. It is specified to operate in ambient conditions from 0°C to 60°C, offering compatibility across a range of installation environments and climates.

Key features at a glance

• Replacement compatibility with WV8840 valves and AO Smith water heaters
• Standing-pilot compatible design for reliable ignition and steady operation
• Immersion-well sensing for responsive temperature regulation
• Made in the United States by Honeywell
• 1-inch cavity specification for fit and retrofit projects
• Ambient operating range: 0°C to 60°C (32°F to 140°F)

Real-world use cases

On service calls where aging or malfunctioning WV8840 valves affect hot water consistency, technicians can consider a WT8840B as a practical replacement path. The immersion-well sensor enables the control valve to react to water temperature changes without extensive rewiring, helping restore steady heated water flow in standing-pilot systems.

Visualize a commercial or multi-residential setup where downtime matters: a ready-to-install WT8840B valve may shorten repair time while preserving the established fuel-control logic. Because the unit is designed for standing-pilot operation, it suits installations that rely on that ignition method.

Quality and integration

• United States-based manufacturing with Honeywell engineering standards
• Designed for AO Smith water heaters to ensure compatibility and reliable performance
• Ideal for technicians performing routine maintenance or upgrades on gas-fired systems

Note: This valve is a component for trained professionals. Always follow official guidelines when replacing a gas control valve and ensure safe operation of gas appliances.