Radiator thermostats

Overview
Documents
Related products
FAQ
Videos

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?

Mechanical radiator thermostats

Are you looking for the updated range of radiator thermostats?

Mechanical radiator thermostats

Smart radiator thermostats

Are you more into smart thermostats that can be controlled via your smart phone?

Go to smart heating

Design thermostats

Explore our range of mechanical design radiator thermostats

Go to design thermostats

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:

Energy savings

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 level

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

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

Installation

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.

Valve connection

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 Aveo^TM and the Aero^TM 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.

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.

Learn more

Documents

Documents
Type	Name	Language	Valid for	Updated	Download	File type
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	Lithuanian	Multiple	31 Jan, 2024	416.6 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	RAE thermostatic sensors	Czech	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	Latvian	Latvia	04 Oct, 2021	857.1 KB	.pdf
Data sheet	RAE thermostatic sensors	Hungarian	Multiple	08 Sep, 2014	1.2 MB	.pdf
Data sheet	RAE thermostatic sensors	Italian	Multiple	27 Apr, 2011	566.0 KB	.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	English	Multiple	08 Aug, 2014	1.3 MB	.pdf
Data sheet	RAE thermostatic sensors	Romanian, Moldavian, Moldovan	Multiple	08 Sep, 2014	1.3 MB	.pdf
Brochure	RAS-D2 Sales Leaflet	English	United Kingdom	11 Sep, 2014	580.8 KB	.pdf
Data sheet	Return temperature limiter type FJVR	Danish	Multiple	04 Jun, 2013	991.4 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	Latvian	Multiple	07 Jun, 2013	1.0 MB	.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	Swedish	Multiple	07 Jun, 2013	995.8 KB	.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	Slovak	Multiple	20 Jan, 2016	1.0 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	Czech	Multiple	07 Jun, 2013	1.1 MB	.pdf
Data sheet	Return temperature limiter type FJVR	Romanian, Moldavian, Moldovan	Multiple	20 Jan, 2016	1.0 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	Romanian, Moldavian, Moldovan	Multiple	16 Jul, 2015	501.2 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	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

FAQ

Can I save energy by using all my radiators?

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.

How do I ventilate a room?

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.

What should be the minimum temperature in a room?

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.

Why should I use sleep mode?

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.

How to set my radiator thermostat?

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

How to mount a Danfoss thermostat?

Here you find installation guides for Mechanical Radiator Thermostats and installation guides for Electronic Radiator Thermostats.

How to replace an old radiator 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.

What to do if my radiator valve is stuck?

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.

Why is only part of my radiator hot?

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.

Videos

Recommended settings on your radiator thermostat

How Thermostatic Radiator Valves increase condensing boiler efficiency

Explanation of symbols on your radiator thermostat