Part No.


Self-powered intelligent Thermostatic Radiator Valve


The thermogenerator converts temperature difference between radiator intake and ambient air into electricity.

Excess energy generated in winter enables continuous operation during transition periods and summer. Maintenance-free operation on 365 days per year. Exact valve position guarantees precise room temperature. Communicates bi-directional with EnOcean radio EEP A5-20-01.

Configurable through remote management / commissioning (ReMan/ReCom). Feedback information to visualize valve status and internal energy-management. Small, compact and lightweight: 55 x 95mm (ø xd), 260g.

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  • Detail

Features, Benefits & Functions

  • 30% energy-savings!  
  • Maintenance-free system, install and forget. The iTRV operates without batteries and wires!  
  • Retro-fit installation
  • On demand, heating control for each room.  
  • Compatible with building automation systems through international EnOcean radio standard.

Thermoelectric principle 

Thermogenerator converts temperature difference between radiator intake and ambient air into electricity. Energy Harvesting enables battery-free, maintenance-free and wireless operation by using radiator heat. Space saving, lightweight and retro-fit installation. Perfect for wireless sensor and actuator equipment for building automation applications.



Self-powered Internet of Things. EnOcean stands for energy harvesting wireless technology, which enables maintenance-free sensor solutions delivering data for intelligent networks in buildings and the Internet of Things.  

Energy Harvesting 

wireless sensors harvest and manage the smallest amount of energy from their environment.  


EnOcean uses wireless standards optimised for solutions with ultra-low power consumption and energy harvesting.  

Ultra-low Power 

Energy management and highly efficient energy storage are key to wireless technology for battery-less wireless sensor solutions.


Valve type:M30 x 1.5
Adapters:availabe for standard valve bodies
Calibration range:> 5.0mm
Operating range (0–100%):2.5mm
Step width min.:1%-steps (0.025mm)
Travel speed:0.95mm/sec
Force in normal operation:100N typical
Radio range:approx. 30 m, depending on room situation
Radio protocol EnOcean (EEP):A5-20-01
 valve position %, target temperature °C
Feedback (EEP):Charging condition, harvesting activity,
 valve position
Radio interval, normal operation:every 10 mins
Radio interval after start-up:every 10 sec during 10 mins
Radio failure interval:1h and protective position
 after 6 attempts at communication
Teach-in through remote management/up to 3 gateways
commissioning (ReMan/ReCom): 
Parametrization through ReCom:Duty cycle (2/5/10min)
 Offset ambient to target temperature
 internal temp. control loop
Feedback through ReCom:Flow temperature (°C), storage voltage (V),
 harvesting voltage (V), RSSI
Control and temperature 
Temperature sensor accuracy:+/- 0,5K
Energy production min.:90 standard heating days
Freeze protection:flow > 40°C
Safety position:<6 °C valve on 50%
IP protection class:>50% valve opening
Ambient temperatureIP4X
during operation:0°C – 50°C
Inlet temperature max.:75°C
Dimensions incl. valve adapter:55 x 95mm (ø x d)