Resideo - Honeywell Home WT8840A1500 Water Heater Control

Water Heater Control from Resideo - Honeywell Home WT8840A1500 delivers precise temperature management for gas water heaters. This reliable control accepts 350–850 millivolt DC input and supports a 0–150°F range to maximize efficiency and comfort in your home.

Equipped with an integrated NTC temperature sensor and 1/2 inch port connections, this control is built for durable upright mounting on water heaters. It meets CSA and CAN/CSA and ANSI standards and is compatible with 2 inch tank insulation, helping reduce standby losses while delivering consistent hot water.

• Port connection: 1/2 Inch Threaded x 1/2 Inch Inverted Flare
• Input supply: 350 to 850 Millivolt DC
• Temperature rating: 0 to 150 Deg F
• Media handled: Gas
• Integrated sensor: NTC Temperature Sensor
• Application: Water Heater
• Mounting position: Upright
• Tank insulation size: 2 Inch
• Ambient temperature range: Operating 32–150 Deg F; Storage -40 to 150 Deg F; Set point 55–155 Deg F
• Standards: CSA 6.20/4.6, CAN/CSA C22.2, ANSI Z21.20/Z21.23/Z21.78/Z21.87
• Capacity: 30–75 ft per 3 hours
• Humidity: 95% (Non-Condensing) at 104 Deg F

Designed for reliable operation in residential settings, this water heater control helps optimize energy usage while maintaining consistent hot water delivery. It is a proven upgrade for existing systems seeking performance and peace of mind.