Weil McLain 383-500-602 Return/Supply Temperature Sensor Kit for Ultra Gas Boilers

The Weil McLain 383-500-602 is a return/supply temperature sensor kit designed for Ultra Gas and Commercial series boilers. This 12 kohm thermistor sensor monitors water temperature in the heat exchanger to ensure proper boiler operation and system efficiency.

Key Features:

• OEM replacement sensor for Weil McLain Ultra Series boilers
• 12 kohm resistance rating for accurate temperature sensing
• Monitors return or supply water temperature in the heat exchanger
• Includes one sensor (kits may include additional hardware)
• Screws directly into dry tapping in aluminum heat exchanger
• Critical component—boiler will not run with defective sensor

This temperature sensor is an essential safety and operational component for Weil McLain Ultra Gas boilers. The sensor provides real-time temperature data to the boiler control system, allowing for proper modulation and preventing unsafe operating conditions. Easy to install with basic hand tools, this sensor typically requires only minutes to replace.

Application: Compatible with Weil McLain Ultra Gas and Commercial series gas-fired boilers. Designed for either return side or supply side installation depending on boiler model requirements.