One of the main questions before buying is how much a warm floor will "consume." Let's look at the real numbers.
Nominal and Actual Power
Nominally, the cable consumes 100–150 W/m². But this is the power at the moment of heating. Thanks to the thermostat, the floor works in cycles: once it reaches the set temperature, it turns off. Therefore, the actual consumption is 2–3 times lower than the nominal.
Calculation Example
For a 5 m² bathroom with a 140 W/m² cable, the nominal power is 700 W. When operating for about 6 hours a day and with heating cycles, the actual consumption will be approximately 2–3 kWh per day.
What affects consumption
Actual consumption depends on the floor's thermal insulation, room temperature, heated area, and flooring type. Under tiles, the floor dissipates heat more efficiently than under thick laminate. Good thermal insulation under the cable and a programmable thermostat are the two main factors for saving energy.
How to save
- Use a programmable or smart thermostat (DEVIreg™ Smart) with a schedule.
- Install high-quality thermal insulation under the cable.
- Heat only the necessary zones and times.
DEVI is one of the most economical systems on the market. You can choose a kit in the Underfloor Heating section.