Resideo by HoneyWell L4006E1091 Aquastat Controller F Range Boiler Safety Controls & Aquastats - 130-270

The Resideo by Honeywell L4006E1091 is a manual reset immersion aquastat controller designed for precise temperature monitoring and control in hydronic heating systems. This reliable temperature control device features a temperature range of 130-270°F with open-on-rise operation, automatically shutting off the system when the high limit temperature is reached.

Key Features:

• Temperature range: 130-270°F (54-132°C) for versatile hydronic applications
• Manual reset operation provides safety by requiring operator intervention after high-limit shutdown
• Open-on-rise action breaks circuit when temperature rises above setpoint
• Immersion-style sensing element for accurate temperature detection in boiler or tank applications
• SPST switching for simple wiring and integration
• Durable construction designed for long service life in residential and light commercial systems

This aquastat controller is ideal for boiler high-limit protection, preventing overheating by interrupting power to the burner or heating element when unsafe temperatures are detected. The manual reset feature ensures that an operator must acknowledge and address the cause of the high-temperature condition before the system can resume operation, providing an important safety function in hydronic heating systems.