Honeywell 305931 Gauge

The Honeywell 305931 is a precision-engineered 1-1/2 inch dial thermometer specifically designed for accurate temperature monitoring in residential and commercial hydronic systems. This REC gauge features a temperature scale of 40°F to 240°F, making it an essential component for tracking hot water heater output, boiler supply lines, and fluid loop performance. Built with a robust housing and a clear lens for high visibility in mechanical rooms, this gauge is a direct replacement for AKS-6263. Its compact diameter allows for installation in tight manifolds or control panels where space is limited. Veteran contractors rely on this model for its consistent thermal sensitivity and long-term calibration stability. Whether you are performing routine maintenance or a full system overhaul, the 305931 provides the real-time temperature data required to verify system setpoints and ensure peak efficiency. This genuine OEM part ensures physical compatibility and reliable NPT connection integration without the need for field modifications.

Key Benefits for Technicians:

• Direct Cross-Reference: Seamlessly replaces legacy AKS-6263 units without requiring piping adjustments.
• Wide Temperature Range: The 40-240 Fahrenheit scale covers the majority of low and high-temp hydronic applications.
• Compact 1.5" Dial: Ideal for high-density mechanical manifolds where larger gauges cannot fit.
• High Visibility: High-contrast markings and needle ensure accurate readings even in low-light boiler rooms.
• Industrial Build Quality: Designed to withstand the vibration and thermal cycling common in HVACR environments.

Common Installation Questions:

What is the primary application for the Honeywell 305931?
This gauge is primarily used for indicating water temperature in boilers, storage tanks, and various hydronic heating loops.

Does this gauge require external power for operation?
No, this is a mechanical bimetallic or liquid-filled sensing gauge (depending on specific series production) that operates independently of electrical systems.

Can the 305931 be used in chilled water systems?
While the scale starts at 40°F, it is optimized for heating applications. For systems operating near or below freezing, a gauge with a lower range is recommended to prevent bottoming out the needle.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.