Low Water Cut-Off with Auto Reset for Hot Water Boilers

Hydrolevel 45-175 – Electronic Low Water Cutoff with Auto Reset for Hot Water Boilers

The Hydrolevel 45-175 is a 120V electronic low water cutoff designed for use on residential and light commercial hot water boiler systems. It continuously monitors water level via a solid-state probe and immediately cuts power to the burner when a low water condition is detected—protecting the system from dry-firing and potential damage. The automatic reset feature restores operation once a safe water level is reestablished, eliminating the need for manual intervention during normal cycling.

Built for Safety and Everyday Reliability

Developed for direct installation into boiler tappings, this model features a shorter probe that facilitates installation in tight locations without compromising sensor performance. Its rugged design and field-tested reliability make it a dependable solution for professional installers seeking long-term boiler protection without unnecessary service callbacks.

Notable Features

• Automatic Burner Reset – Resumes burner function after water returns to probe level with no user action required.
• Short Probe Design – Fits more easily into smaller boilers or limited-clearance installations.
• Low Water Alarm Contacts – Optional dry contacts available for auxiliary alarm or remote notification systems.
• Solid-State Reliability – Electronic sensing eliminates moving parts prone to wear or mineral fouling.
• Field-Proven Construction – Durable enough to withstand harsh boiler room environments and frequent thermal cycling.

Product Specifications

• Model: 45-175
• Voltage: 120V AC
• Reset Type: Automatic
• Application: Hot water boilers
• Probe Type: Short length, solid-state

Installation Considerations

Installation should be completed by a qualified professional to ensure electrical safety and proper integration with burner control systems. The control is designed for use in ¾" boiler tappings and may require careful placement depending on boiler model and water level tolerances. Always verify compliance with local codes during installation.

Contractor-Grade Protection

The Hydrolevel 45-175 provides the level of safety and dependability professionals need in both new installations and boiler retrofits. With simple wiring, built-in alarm contact options, and auto-reset functionality, it offers a solid balance of safety, convenience, and value. Ideal for maintenance programs and code-compliant system upgrades.

Reliable Safeguard for Any System

Boilers without low water protection are at serious risk for overheating and catastrophic failure. The Hydrolevel 45-175 offers smart, automatic burner control in the event of water loss—helping contractors protect equipment, reduce liability, and maintain efficient system operation year-round.