Outdoor Temperature Sensor for Ultra Boilers
6 Available At All US Supply Locations

Weil-McLain 510-312-218 Outdoor Temperature Sensor – Precision Control for Ultra Boilers
The Weil-McLain 510-312-218 Outdoor Temperature Sensor is designed to integrate with Ultra series boilers, enabling accurate outdoor reset functionality. By monitoring exterior conditions, this sensor allows the boiler to adjust output automatically, improving efficiency and maintaining consistent indoor comfort levels.
Constructed to withstand demanding outdoor environments, the sensor provides long-term reliability and dependable performance in variable climates.
Key Benefits
- Accurate Measurement: Thermistor-based sensor delivers precise outdoor temperature readings.
- System Optimization: Supports energy savings by adjusting boiler operation based on real-time weather conditions.
- Seamless Integration: Engineered for use with Weil-McLain Ultra series boilers, ensuring full compatibility.
- Durable Housing: Built to resist moisture and temperature extremes for reliable service life.
- Consistent Comfort: Helps maintain stable indoor conditions by minimizing temperature fluctuations.
Technical Specifications
- Model: 510-312-218
- Compatible Systems: Weil-McLain Ultra series boilers
- Temperature Range: -30°F to 120°F
- Sensor Type: Thermistor
- Wiring: 2-wire connection
Installation Notes
Installation requires proper placement on an exterior wall clear of direct sunlight and heat sources for accurate readings. A 2-wire connection to the boiler’s control board is required. For best results, installation should be completed by a licensed HVAC professional to ensure compliance with local codes and to verify correct system integration.
Professional Use Guidance
Contractors: This sensor provides a straightforward method for enabling outdoor reset, reducing operating costs and improving system performance on Ultra boilers. Its durable design minimizes call-backs and maintenance issues.
Maintenance: Periodic inspection of wiring and housing is recommended to ensure continued accuracy and protection against environmental wear.
Summary
The Weil-McLain 510-312-218 Outdoor Temperature Sensor is a critical control accessory that enhances boiler efficiency through precise outdoor reset functionality. Its robust design and seamless compatibility with Ultra series models make it a dependable choice for professional installations.
Specifications
| Weight | 1.000000 |
|---|---|
| Length (inches) | 3 |
| Width (inches) | 2.13 |
| Height (inches) | 1.25 |
| Item Type | Temperature Sensors |
| Brand | Weil McLain |
| Manufacturer | Weil McLain |
| MPN | 510312218 |
| Sub Type | Outdoor Temperature Sensor |
| Item Returns | This item can be returned |
