Resideo by Honeywell L4006A1959 Aquastat Temperature Controller 40-180F

The Resideo by Honeywell L4006A1959 is a reliable immersion aquastat controller designed for boiler and hot water heating systems. This temperature control device breaks the circuit on temperature rise, providing essential overheat protection and temperature regulation for residential and commercial heating applications.

Key Features:

• Adjustable temperature range: 40°F to 180°F for versatile heating system control
• Fixed differential of 5°F ensures consistent temperature regulation
• Breaks on temperature rise (B.O.R.) operation for overheat protection
• Immersion-style design for direct contact with water for accurate temperature sensing
• SPDT switching for flexible wiring configurations
• Durable construction for long-lasting performance in heating system environments
• Compatible with boilers, hot water storage tanks, and hydronic heating systems

This aquastat controller is ideal for applications requiring automatic temperature control and safety shutdown on overheat conditions. The 5°F fixed differential prevents short cycling while maintaining consistent water temperatures. Commonly used in boiler control circuits, hot water heater applications, and hydronic heating zone control.