Radiator operators

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Danfoss radiator thermostats help people to obtain comfort in their homes. By maintaining constant desired room temperatures, individually or room by room, and by helping to reduce energy consumption.

They can save approximately 20% compared to a manually operated valve due to utilization of free heat gains and constant room temperature.

Robustly built and designed to meet the rigors of domestic life, we offer an extensive range of radiator thermostats that increase comfort and save energy.

Features and benefits

Ensures optimal comfort at home, room by room.

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

How does a radiator thermostat work?

See how a Danfoss radiator thermostat works


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
Installation guide RA2000 RAVB Replacement Kit Installation Instructions (013X3180/82) English United States 03 Jul, 2014 621.8 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
Catalog RA2000 Thermostatic Radiator Valve, Electric Zone Valve & Pressure Bypass Valve Catalog English Multiple 22 Jun, 2015 1.3 MB .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.

Operator mounting correct orientation guide


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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