Weil McLain 383-500-630 Gauge Assembly

The Weil McLain 383-500-630 Gauge Assembly is a high-precision OEM replacement component engineered specifically for Weil McLain Ultra series boilers. As a dual-function monitoring solution, this assembly integrates a boiler pressure gauge and a temperature sensor into a single, streamlined interface. This design allows technicians to conduct rapid diagnostics and verify that the system is operating within the standard 12–25 psi range for residential hydronic applications. The temperature and pressure sensor combination provides real-time analog data, serving as a critical hardware redundancy for electronic controls. Built with a 1/4" NPT rear mount and frequently paired with a 1/2" NPT adapter, this Weil McLain replacement part ensures a secure, leak-proof fit at factory-specified tap points. Maintaining a functional Ultra gas boiler gauge is essential for preventing short-cycling and identifying air entrainment or under-pressurization before they cause a system lockout. This 3.12-inch diameter assembly is the standard specification for Ultra Series 3, 3UE, and CT models, ensuring full compatibility with factory manifolds.

• Dual-Function Diagnostics: Provides simultaneous monitoring of system pressure (0–75 psi) and water temperature (60–320°F) for efficient commissioning.
• OEM Precision: Guaranteed Weil McLain 383-500-630 fitment ensures the mechanical calibration matches the specific curves of Ultra series heat exchangers.
• Enhanced Reliability: The analog dial functions independently of the boiler’s electronic control module, providing a fail-safe readout during power cycles.
• Robust Construction: Engineered to withstand the thermal expansion cycles typical of high-efficiency condensing gas boilers.
• Direct Replacement: Designed for standard factory tapings, reducing the time required for field installation during routine maintenance.

Which boiler models is this gauge compatible with?
This pressure/temperature gauge assembly is specifically designed for Weil McLain Ultra Gas Boilers, including Series 3/3UE/CT and Ultra-80 models. It is not a universal part and should only be used where the 383-500-630 part number is specified in the manual.

Does this assembly include the sensing elements?
Yes, the Weil McLain 383-500-630 package includes both the integrated temperature and pressure sensors required for a full replacement of the original dial assembly.

What is the connection size for this gauge?
The assembly typically features a 1/4" NPT threaded connection. Technicians should verify if the existing installation uses a 1/2" NPT well or adapter bushing, which is sometimes required depending on the specific boiler manifold configuration.

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.