Frequently Asked Questions

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For consumers

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.
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.
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.
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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Purchase Themo thermostats from our online store

Get one Themo for each room with underfloor or ceiling heating. The more Themo thermostats you need, the lower the price per unit.
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Purchase Themo thermostats from your closest retailer

If you are a corporate customer (a representative of a housing company or property company, for example), book a free, 30-minute Themo demonstration online or fill in the contact request form and we will assist you directly.
Purchase here

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.

Book a demo with me by choosing a date from the calendar

Explore the benefits offered to property companies by the Themo Control by booking a thirty-minute demonstration in the calendar. The demonstration will be carried out remotely or via telephone.

  • See how Themo reduces the amount of electricity consumed by underfloor heating in wet rooms by up to 50 %
  • Learn how easy the Themo Control is to implement
  • Hear why the Themo Control will always remain cash flow positive
  • Find out whether Themo is suitable for your property