Thermostatic radiator operators

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Danfoss thermostatic radiator valve operators optimize the heating of your home and save energy without compromising comfort.

Easily set and maintain your preferred temperature, even down to each individual room. Maybe you like your living room nice and warm but want to keep a rarely used spare room at minimum temperature? Plus, heating your home more efficiently allows you to not only enhance comfort, but you can reduce your heat consumption significantly simply by upgrading your old thermostats.

Danfoss invented the thermostatic radiator valve more than 80 years ago and today, more than 40 million homes are heated with this technology.

Features and benefits

Ensures optimal comfort at home, room by room.

Our product range covers both liquid thermostats as well as fast-responding gas and electronic thermostats for improved energy efficiency.

The world’s only TRV operator with gas-filled sensor: One of the secrets of the operators service life of over 20 years is the gas charged, precision-manufactured sensors. Unlike other fillings, gas maintains a high regulating capacity and reactivity.

Unique click-connection for fast and easy installation - for both DIY and professional installers.

How does a radiator thermostat work?

See how a Danfoss radiator thermostat works

Product range


Type Name Language Valid for Updated Download File type
Data sheet Operator Replacement Identifier: Type RA / RAV to RA2000 English Multiple 18 Jan, 2023 279.1 KB .pdf
Data sheet Operator Replacement Identifier: Type RA / RAV to RA2000 English Multiple 05 Dec, 2023 356.4 KB .pdf
Installation guide RA2000 Tamper-resistant operator installation instructions English United States 01 Feb, 2003 221.0 KB .pdf
Data sheet RA2000 Thermostatic Radiator Valve and Operator Datasheet English Multiple 29 Jun, 2022 842.6 KB .pdf
Data sheet RA2000 Thermostatic Radiator Valve and Operator Datasheet English Multiple 22 Jan, 2024 1.2 MB .pdf
Installation guide RA2000 Valve Mounted Operator Installation Instructions English United States 12 Dec, 2018 425.1 KB .pdf
Installation guide Thermostatic Radiator Valve and Operator Cross Reference Guide_VQFNA122 English United States 12 Apr, 2010 156.0 KB .pdf



General Info

Control of the space temperature at a comfortable level is easily accomplished by adjusting the dial clockwise or counterclockwise.

The dial has a numbered scale of 1 to 5 corresponding to temperatures of approximately 57°F to 79°F (14°C to 26°C).

I * 1 2 3 4 5 I
45°F 50°F 57°F 63°F 68°F 73°F 79°F 86°F
7°C 9°C 14°C 17°C 20°C 23°C 26°C 30°C

Should the space be unoccupied for an extended period, the dial can be set to the star symbol (*) for freeze protection (50°F or 9°C) to save energy.

Mounting / Placement

The operator or sensing element must not be:

  • in a drafty location
  • covered
  • installed above a heat source

The correct orientation direction is dependent upon the selected operator type. See the mounting guide visual below for reference.


There are a couple of reasons for overheating depending upon which system you have:

For One or Two-pipe systems:

  • Ensure operator is not in a cold or drafty spot
  • Check on dial adjustment knob as setting could be set too high
  • Add a vacuum breaker which allows steam supply to cycle properly

For Hot Water systems:

  • Check operator installation as it may not be seated properly

For 'under heating' issues: 

  • Ensure radiator is not blocked by furniture, heavy curtains, etc.
  • Ensure operator is not in a 'hot' spot or wrong sensor location for that product selection.

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