Radiator thermostats

  • Overview
  • How it works
  • FAQ
  • Related products
  • Documents

Danfoss radiator thermostats optimize the heating of your home and save energy without compromising on comfort.

You can 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 get a better comfort. In fact, you can reduce your heat consumption significantly simply by upgrading your old thermostats.

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

Features and benefits

Danfoss radiator thermostats maintain your desired room temperatures for optimal comfort in your home, room by room.

Fast response time compared to a manual valve helps reduce your energy consumption.

Unique click-connection for fast and easy installation - for DIY and professionals.

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

Mechanical, smart or design thermostat?

Find the right product

Check out our easy and simple product overview and find exactly what you need. We have a radiator thermostat (TRV) for any challenge.

Go into details:

Self-regulating thermostatic radiator valves can save a lot of energy compared to manual valves. Studies show that the energy savings potential going from manual to thermostatic is between 30-36%. Going from a 15+ year old thermostat to electronic thermostats opens for another 23% savings to tap. The newer the technology, the more savings. Each leave does not represent an exact figure but gives a rough illustration on the energy savings performance.


Learn more about the energy savings potential of installing thermostatic radiator valves

Comfort performance is closely linked to the thermostats ability to keep the temperature as close as possible to the set point. Two main factors affect the performance; precise temperature control and reaction time. Our thermostats span from 1-22 min response time depending on the filling inside the bellow.
Each house symbol on the overview does not represent an exact figure but gives a rough illustration on the added performance on temperature regulation and comfort. Learn more about the effect of response time below.

Response time is the time it takes before the thermostats detects a change in temperature, and then starts to compensate for it by opening or closing the valve, to either lower or increase the temperature in the room, to reach the desired set temperature. Not to be mixed with the time it takes for the thermostat to restore the set temperature in the room.

Response time is closely linked to the filling medium inside the bellow of the thermostat. Wax is the slowest (40 min) where Danfoss does not have an offering. Then comes liquid (15-22 min) and our premium gas (10 min) which is the fastest reacting mechanical thermostat on the market. Finally, electronic components as the top-performer with 1 min response time.
The faster the response time, the better the comfort.


Learn more about reaction time and how it effects thermostat performance

Tells you what tool is required to install the thermostat. The symbol with the click-lock function represents our patented tool-free installation feature that allows you to install the thermostats using only your hands. This patented solution also makes sure that the clamping force is adequate, so it will not damage the thermostat or the valve but still securing a very firm grip.

Provides you with a quick overview of which connection types fit with our thermostats, so you easily can pick what type of thermostat to choose for replacement. In the mechanical range, you get the most options from the AveoTM and the AeroTM which fits RA, RAV, RAVL and RTD valves. From the electronic range, you get a broad range of options with the adapter system that fits 90+% of all radiator valves out there.

A quick and easy way to reduce your energy consumption

Check your savings potential

Upgrading your old radiator thermostats is a quick and easy way to reduce your energy consumption—and lower your heating bill. Want to know how much you can save? Check out our infographic to find out.

How it works

These videos cover essential information on radiator thermostat settings, symbols, and how thermostatic radiator valves can increase condensing boiler efficiency. Radiator thermostats are a fast and cheap way to optimize the heating system.

Smart heating solution

Were you looking for smart radiator heating?

We have a smart heating solution to match your radiator. All solutions can be controlled with your smartphone and programmed to suit your daily needs.

FAQ

You save nothing by having just one radiator on full throttle and the others closed. In fact, a fully heated radiator will use more heat than 2 or 3 that are turned only a quarter of the way up. This is especially true if your heat source is district heating.

When ventilating a room in your home, turn down your thermostat and leave the windows open for 5-6 minutes. If you don’t turn down your thermostat, it will react to the draft by heating up automatically.

Always maintain a minimum of 16 °C in all the rooms in your home. You should avoid going below 14 °C as this might damage the building and cause dampness, condensation, and mold.

You can save both energy and money by turning your radiators down 2-3 °C at night. But remember: If you turn them down more than 3 °C, the money you could save will be used to reheat the room the next day.

Check the video below to see recommended settings for your thermostat.

It all depends on your existing radiator thermostats, but here are some videos on how to demount and change different types of mechanical radiator thermostats as well as Electronic Radiator Thermostats.

Massage the radiator valve by following these steps. Remove the thermostat with an Allen key or by turning counterclockwise (on newer models). Gently push in on the exposed radiator valve pin with the flat end of the Allen key. The pin should move in 2-3mm and bounce out again. If the radiator thermostat valve pin is stuck, gently alternate between tapping the valve’s side and moving the pin in and out until it frees. Check for leaks and reattach the thermostat.

Your radiator works just as it should when it is warm on top and cold at the bottom. The hot water from the main supply enters the top of the radiator and the heat from this water is used to heat up the room. The cooled water is then sent back through the system.

Related products

How to buy Danfoss products

No matter what heat source you have, you can find Danfoss products and smart solutions to match. We do not sell directly to consumers, so simply search for our products online or visit your local retailer. And if you prefer not to DIY, contact your local installer instead. If you need product support, you can find it on our support pages located under each product page.

Documents

Promotional and Technical Documents

Type Name Language Valid for Updated Download File type
Data sheet Adapters for thermostatic sensors Lithuanian Multiple 31 Jan, 2024 416.6 KB .pdf
Data sheet Adapters for thermostatic sensors Latvian Multiple 31 Jan, 2024 418.4 KB .pdf
Data sheet Adapters for thermostatic sensors English Multiple 31 Jan, 2024 394.6 KB .pdf
Data sheet Adapters for thermostatic sensors German Multiple 22 Jan, 2024 420.5 KB .pdf
Data sheet Éléments thermostatiques RAE French Multiple 09 Jan, 2013 8.0 MB .pdf
Data sheet FJVR Ukrainian Ukraine 24 Dec, 2021 204.2 KB .pdf
Data sheet RA Plus & RA-K Plus programmable radiator thermostat Latvian Multiple 28 Mar, 2011 1.1 MB .pdf
Data sheet RAE thermostatic sensors Romanian, Moldavian, Moldovan Multiple 08 Sep, 2014 1.3 MB .pdf
Data sheet RAE thermostatic sensors Spanish, Castilian Multiple 08 Sep, 2014 1.2 MB .pdf
Data sheet RAE thermostatic sensors German Multiple 13 Aug, 2020 1.4 MB .pdf
Data sheet RAE thermostatic sensors Dutch, Flemish Multiple 08 Sep, 2014 1.1 MB .pdf
Data sheet RAE thermostatic sensors Italian Multiple 27 Apr, 2011 566.0 KB .pdf
Data sheet RAE thermostatic sensors English Multiple 08 Aug, 2014 1.3 MB .pdf
Data sheet RAE thermostatic sensors Hungarian Multiple 08 Sep, 2014 1.2 MB .pdf
Data sheet RAE thermostatic sensors Czech Multiple 08 Sep, 2014 1.3 MB .pdf
Data sheet RAE thermostatic sensors Latvian Latvia 04 Oct, 2021 857.1 KB .pdf
Brochure RAS-D2 Sales Leaflet English United Kingdom 11 Sep, 2014 580.8 KB .pdf
Data sheet Return temperature limiter type FJVR Lithuanian Multiple 07 Jun, 2013 1.0 MB .pdf
Data sheet Return temperature limiter type FJVR Danish Multiple 04 Jun, 2013 991.4 KB .pdf
Data sheet Return temperature limiter type FJVR Slovak Multiple 20 Jan, 2016 1.0 MB .pdf
Data sheet Return temperature limiter type FJVR Latvian Multiple 07 Jun, 2013 1.0 MB .pdf
Data sheet Return temperature limiter type FJVR Polish Multiple 04 Jan, 2016 1.0 MB .pdf
Data sheet Return temperature limiter type FJVR English Multiple 04 Jun, 2013 678.2 KB .pdf
Data sheet Return temperature limiter type FJVR Serbian (RS) Multiple 05 Nov, 2009 589.5 KB .pdf
Data sheet Return temperature limiter type FJVR Czech Multiple 07 Jun, 2013 1.1 MB .pdf
Data sheet Return temperature limiter type FJVR German Multiple 01 Sep, 2020 1.4 MB .pdf
Data sheet Return temperature limiter type FJVR Swedish Multiple 07 Jun, 2013 995.8 KB .pdf
Data sheet Return temperature limiter type FJVR Romanian, Moldavian, Moldovan Multiple 20 Jan, 2016 1.0 MB .pdf
Case story Save energy and money with AI and dynamic balancing Polish Poland 12 Dec, 2023 2.9 MB .pdf
Case story Save energy and money with AI and dynamic balancing English Multiple 03 Oct, 2023 2.3 MB .pdf
Case story Save energy and money with AI and dynamic balancing Finnish Finland 06 Nov, 2023 2.8 MB .pdf
Case story Save energy and money with AI and dynamic balancing Swedish Sweden 02 Jan, 2024 2.9 MB .pdf
Data sheet Thermostatic Sensors RAS-C & RAS-CK Latvian Multiple 01 Sep, 2010 708.3 KB .pdf
Data sheet Thermostatic Sensors RAS-C & RAS-CK Estonian Multiple 08 Nov, 2016 218.3 KB .pdf
Data sheet Thermostatic Sensors RAS-C & RAS-CK Lithuanian Multiple 20 May, 2016 306.2 KB .pdf
Data sheet Thermostatic Sensors RAS-C & RAS-CK English Multiple 05 May, 2011 8.8 MB .pdf
Data sheet Thermostatic Sensors RAS-C & RAS-CK Romanian, Moldavian, Moldovan Multiple 16 Jul, 2015 501.2 KB .pdf

Environmental Product Declaration (EPD) Documents

Type Name Language Valid for Updated Download File type
Product Environmental Information - BI EPD Aveo and Aero radiator thermostat, BIS English Multiple 13 Apr, 2023 2.6 MB .pdf
Product Environmental Information - BI EPD Aveo and Aero radiator thermostat, RS English Multiple 13 Apr, 2023 2.6 MB .pdf
Product Environmental Information - BI EPD for REACT, REDIA and REGUS radiator sensors English Multiple 06 Mar, 2024 3.3 MB .pdf
Heatman

Interested in more tips and advice?

From simple or more advanced upgrades to smarter heating of your home, Danfoss products and solutions can help you take control of your heat consumption—whatever your heating bill is up against.