TRV-ULE is a Smart Radiator Thermostat designed to be incorporated into home heating system, maintaining a comfortable room temperature by controlling the flow of hot water to home radiators. By regulating the flow of hot water, users can maintain their desired room temperature to suit various needs. With TRV-ULE, users can remotely control home temperature when they are away from home, and program the device to respond automatically to certain situations. TRV-ULE is also ideal for energy management to ensure the system do not run for longer than needed.

Conforms with M30 x 1.5
Anti-frosting below 5°C


  • Automatic on/off control of radiator valve according to temperature settings
  • LCD displays temperature, time, mode and alerts
  • Anti-frosting function when room temperature drops below 5°C
  • Anti-calcification: weekly opening/closing of radiator valves
  • Boost Function to temporarily speed up heating process
  • Detect sudden temperature drop and adjust settings accordingly to sustain the ideal room temperature
  • A User-friendly interface with 2 buttons
  • Low battery detection
  • Regular supervisory signals ensure the device’s proper operation
  • Conform with M30 x 1.5 connection
  • Compatible with Danfoss RA, RAV, or RAVL valve adapters


  • Communication protocol: DECT ULE RF Protocol
  • Frequency: 1880 MHz - 1900 MHz (EU) / 1920 MHz - 1930 MHz (US)
  • Power supply: 1.5V, AA Alkaline battery x 2
  • Battery life: 1 year
  • Operating temperature: -10°C to 45°C (14°F to 113°F)
  • Operating humidity: Up to 85% non-condensing
  • Dimensions: 108 mm x 57 mm x 66 mm

Product Documents