Frequently Asked Questions

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Themo Smart Thermostat and other heating systems

Can I use Themo Smart Thermostat in electric ceiling heaters?
Yes, Themo Smart Thermostat has an air sensor and works with ceiling heaters.
Can I use a Themo Smart Thermostat with other heating systems (boilers, heat pumps, radiators)?
Electric ceiling heater: Yes, Themo Smart Thermostat has an air sensor, which allows it to work with ceiling heaters.

Boilers: You will need a Themo price switch. Please contact info@themo.io for more information.

Hydronic underfloor heating: If your system is equipped with 220V wall-mounted thermostats, you can replace them with Themo Smart Thermostats. The product is not compatible with 24V or battery-operated systems. The price optimization will not be as accurate as it is with electric underfloor heating systems, as Themo Smart Thermostat controls the water circulation. The electricity is consumed by an air-water or ground source heat pump, and there is a small amount of inertia before the pump is activated.

Radiators: Due to its air sensor, Themo Smart Thermostat is able to control electric radiators. The installation does however require some customization by a qualified electrician.
Can I use Themo Smart Thermostat in a hydronic underfloor heating system?

If you have 220 V wall thermostats, you can replace them with Themo Smart Thermostats. The product will not work with 24 Volt or battery operated systems. Price optimisation does not work as accurately as with an electric underfloor heating system because the Themo Smart Thermostat controls the water circulation. The actual electricity consumption is done by the air-to-water heat pump or geothermal heat pump, and there is always some inertia before it detects that it is time to start using electricity.

Can I use Themo Smart Thermostat on radiators?

Themo Smart thermostat can control electric radiators using its air sensor. However, installation requires a custom-made installation by an electrician.

Themo Smart thermostat installation and features

How can I tell if my electric underfloor heating is compatible with Themo?
Themo is compatible with all electric underfloor heating systems. If you have a wall-mounted thermostat, you will need a Themo Smart Thermostat, and if your thermostat is located at the switchboard, you will need a Themo DIN. Check sections 5 and 6 to ensure that all requirements are met.
How can I install a Themo Smart Thermostat?
Themo Smart Thermostat can only be installed by a qualified electrician. The installation of a single device will take approximately 15 minutes.
Does Themo Smart Thermostat work with my existing floor sensor?
Yes, Themo Smart Thermostat is controlled by an automatic algorithm that calibrates itself to use your existing floor sensor. You do not have to replace the floor sensor. You can also adjust the floor sensor setting at app.themo.io.
Does Themo Smart Thermostat include a residual-current device?
No, you will need a separate circuit breaker. Please contact an electrician if your current thermostat is equipped with a residual-current circuit breaker.
Is Themo Smart Thermostat waterproof in the bathroom?
Themo Smart Thermostat is not damaged by moisture, but according to Nordic regulations, a thermostat must be IP44-protected if it is located close to a water point. (https://tukes.fi/sahko/sahkotyot-ja-urakointi/sahkoasennusten-tekniset-vaatimukset/kylpy-ja-suihkutilojen-sahkoasennukset, in Finnish). ABB's Jussi range includes an IP44 enclosure that is compatible with Themo.
Is Themo Smart Thermostat compatible with my wall frame?
Themo Smart Thermostat will fit a regular 55 x 55 mm wall frame. Compatible frames can be found in the Schneider Exxact and ABB Jussi ranges, for example.
My home includes several heating zones. Can a single Themo Smart Thermostat be used to control them all?
Each heating zone (a heated room in practice) requires a dedicated Themo Smart Thermostat.

How does Themo Smart Thermostat work?

How does Themo Smart Thermostat save money?
Themo Smart Thermostat reduces your consumption of energy by 20% on average by scheduling the heating, thus making sure that electricity is not consumed 24/7. The Themo algorithm utilizes machine learning and weather forecasts to further reduce your energy consumption. If you are an exchange electricity customer, Themo Smart Thermostat will reduce your electricity bills further still by approximately 12%, as it uses electricity when it is at its cheapest. See the Themo Smart Thermostat page for more information.
Can I specify my own heating schedule?
Yes, you can specify your desired heating schedule in the Themo app. You can design a weekly schedule and set a desired target temperature at an hourly level. The Themo algorithm will calculate the most affordable heating period based on your preferences.
What happens if the Internet goes down or there is a power cut?
Themo Smart Thermostat will remember the most recent heating schedule for 24 hours after the last data point. If the device remains offline for more than 24 hours, Themo Smart Thermostat will switch to frost protection mode (The default temperature is +5 °C. You can specify your desired frost protection temperature in the mobile app.) You can also use the front panel of the device to control your Themo Smart Thermostat at all times.
How does Themo Smart Thermostat response?
We use encryption and authentication technologies that conform to industry standards in order to ensure the safety of Themo products, prevent unauthorized access, and enable control of the devices.
Does Themo Smart Thermostat observe my electricity contract?
You can specify electricity price determination in the Themo app. The Themo algorithm supports SPOT electricity pricing, day and night-time rates, and fixed pricing. You can also add the transmission price in the Themo mobile app.
When will Themo introduce the 15-minute balance tracking period?

The 15-minute market will be introduced simultaneously across the EU. The introduction of quarterly pricing was postponed to 14 May 2025 and will be introduced on the last day of September for trading on the first day of October. Themo is able to introduce quarterly pricing for device control when periodic pricing is also published for 15-Minute Market Time Units.

What do I need to know about the 15-minute balancing period?

The move to 15-minute balancing period is a major milestone in the development of a common European electricity market. It is expected to improve market efficiency, price formation and flexibility, and help the electricity system to adapt to fluctuations in energy production and consumption. Read more at https://www.nemo-committee.eu/sdac

Is there an update coming for my device to enable the 15-minute balance tracking period?

Yes. We will be releasing an update for devices to allow them to move to 15-Minute Market Time Unit. Prior to the release of the update, information will be posted on our Support site about what will change with the update. We will also post a notice on our support site if some of the older versions of your device no longer support the update.

How will the 15-minute balance tracking period change the way my device works?

Themos principle of operation of the smart thermostat remains the same. Only for customers who use exchange electricity price data for their optimisation, the length of the pricing period will change from the current one hour to a 15-minute balancing period when it is introduced.

Does Themo Smart Thermostat work with solar panels?
This feature is in development.
Can I return a Themo Smart Thermostat if I am not happy with it?
Yes, we offer a 100-day money-back guarantee for Themo Smart Thermostats purchased from our online store.

Themo App

Can I specify an upper limit for the price of electricity?
Yes, at present you can specify price limits at app.themo.io.
Does Themo offer Smart Home integrations (such as Home Assistant)?
We are currently developing integrations. We expect to introduce the home assistant in 2023.
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Getting a Themo smart thermostat or Themo DIN for your home

Purchase a Themo Smart Thermostat for each room with underfloor or ceiling heating. 

You can also purchase a Themo DIN controller that is mounted onto the switchboard and allows you to optimize the electricity consumption of a storage water heater, heat pump, or electric underfloor heating.

How to buy Themos
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Are you a representative of housing or real estate company - check out Themo Control

If you are a corporate customer (a representative of a housing company or property company, for example), reserve a free, 30-minute Themo Control survey online or fill in the contact request form and we will assist you directly.
Read more about Themo Control

For Property and Housing Companies

How does the Themo Control work?
We survey the underfloor heating optimization needs of the property and offer a service comprising everything from informing the residents to the installation of thermostats, remote monitoring, warranty repairs, and the option to monitor and control the room- and apartment-specific heating optimization through the Themo portal at a fixed monthly price.
How much does the Themo Control cost?
The fixed-price service is invoiced on a monthly basis and the first invoice will be sent a month after the system has been implemented. This means that no initial investment is required. We guarantee that the achieved savings will always exceed the price of the service.