Watts 671 is a WiFi-enabled snow melting control system designed to automatically detect and respond to snow or ice on roads and walkways. It operates hydronic and electric heating equipment to melt snow and ice, ensuring safe and clear surfaces. The control works with tekmar Snow/Ice Sensor 090 or Snow Sensor 095 for accurate detection. It offers manual and automatic melting operation, with the ability to set a timed stop. The system features a user-friendly interface with a clear display showing system status, slab and outdoor conditions, and sensor readings.