Description
The Weil McLain 381-356-586 is a 12K OHM Outdoor Air Sensor engineered to deliver accurate outdoor ambient temperature readings to Weil McLain boiler control systems. By continuously monitoring outdoor conditions, this sensor enables the boiler to intelligently adjust its output, improving comfort and reducing fuel consumption through outdoor reset control strategies.
Key Features
- 12K OHM thermistor resistance rating for precise temperature sensing
- Designed as a genuine Weil McLain OEM replacement part
- Compatible with Weil McLain boiler control systems that support outdoor reset functionality
- Outdoor-rated construction to withstand exposure to the elements
- Supports outdoor reset logic to optimize boiler water temperature based on ambient conditions
- Helps improve system efficiency and reduce heating costs
Why Outdoor Reset Sensing Matters
Outdoor reset control is one of the most effective strategies for improving hydronic heating efficiency. By measuring the outdoor air temperature, the boiler control can modulate supply water temperature in real time — delivering only as much heat as the building demands. The Weil McLain 381-356-586 sensor is the factory-specified component to make this possible, ensuring accurate signal input and reliable system communication.
Application
- Weil McLain residential and light commercial boiler systems with outdoor reset capability
- Replacement for worn, damaged, or failed outdoor air sensors
- New installations requiring outdoor temperature sensing for boiler controls
Product Details
- Brand: Weil McLain
- Part Number: 381-356-586
- Sensor Type: Outdoor Air Temperature Sensor
- Resistance: 12K OHM







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