How does IR heating work? The principle of radiant heat

Before deciding on a heating system, it is wise to understand how it works. IR heating differs from classic heating systems in one key principle: it does not heat the air, but surfaces. This seemingly small difference has significant consequences in practice – for comfort, for energy consumption, and for long-term costs.

IR heating works by IR panels emitting infrared radiant energy, which directly heats objects and walls in the room instead of the air. When these surfaces heat up, they radiate heat back into the room. The result is pleasant, even heat from floor to ceiling, without air circulation and without noise.

Radiant heat: how IR heating transfers energy

Heat is transferred in three ways:

IR heating uses the third principle – radiation.

IR panels emit electromagnetic waves in the long-wave infrared spectrum, called IR-C. This radiation travels through the air without loss – just as solar heat travels through space.

When IR radiation reaches a solid surface – floor, walls, furniture, or a person – it is absorbed and converted into heat.

Therefore, the air is not heated directly. It is heated indirectly, through the heated surfaces in the room. Since there is no need to heat large volumes of air, energy is used more efficiently – where you actually need it.

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IR heating compared to classic systems: heat in the room

Classic heating systems – radiators, underfloor heating, pellet stoves – heat the air by convection. Warm air rises towards the ceiling, while cold air remains near the floor. The result is a temperature difference between the floor and the ceiling of 5–7 °C and constant air circulation, which carries dust, mites, and bacteria.

With IR heating, this difference is only 1–2 °C. Heat is evenly distributed from floor to ceiling, because heated surfaces – not the air – radiate heat in all directions.

Comparison IR heating Convection systems (radiators, heat pumps)
Heat transfer principle Radiation (IR waves) Convection (air circulation)
What warms up first Surfaces, objects, people Air
Floor/ceiling temperature difference 1–2 °C 5–7 °C
Air circulation Minimal Intensive
Dust disturbance Minimal Intensive
Floor temperature 3–4 °C higher than with radiators Cold (without underfloor heating)
Moisture in walls Reduces – walls dry out No effect
Operating sound Silent – no fans Fans, pumps

One of the most common remarks from our customers is precisely this: »Nobody believes we don't have underfloor heating – the floors are warm.« This is because the radiant heat from IR panels directly reaches the floor surfaces and heats them, something conventional convection heating without floor pipes cannot achieve.

How does an IR panel Ekosen emit heat?

An IR panel is an electrical device with no moving parts. Electrical energy is converted into infrared radiant energy in the panel's surface – with an efficiency of 95 to 98% for Ekosen IR panels. Losses are minimal because there are no pipes, ducts, or heat exchangers where energy would be lost 'along the way'.

Ekosen IR panels emit heat at a wide angle, ensuring uniform coverage of the space. The surface temperature of the panel is 80–95 °C, which is sufficient for effective IR radiation, while not posing a danger upon accidental touch (unlike some heaters that have a surface temperature of 200+ °C).

Ceiling or wall mounting – which is more suitable?

In most cases, ceiling mounting is optimal. The reason is geometric: the distance between the ceiling and the floor is shorter than the distance between opposite walls, which means that IR radiation reaches the floor at a more suitable angle and with fewer heat losses. Additionally, ceiling mounting ensures that the IR panel cannot be blocked by furniture.

The optimal ceiling height for ceiling mounting is between 2.2 and 3.5 m. Standard residential heights are therefore ideal. For heights above 3.5 m – often in older houses, commercial premises, or industrial facilities – a precise power calculation is required, as the IR radiation must travel a greater distance to the floor and walls.

This does not mean that IR heating does not work in high spaces; it only means that higher-power panels or a greater number of panels are needed.

Wall mounting of IR panels is suitable in specific situations – for example, in a bathroom above a mirror or in a hallway where ceiling mounting is impractical. The basic rule for wall mounting: the IR panel must not be pointed directly at window surfaces, as this results in greater heat losses.

Furniture and objects in front of the panel must be at least 80 cm away.

Why does regulation decisively affect consumption?

An IR panel by itself operates simply – on/off. But when heating an entire home, it's crucial when and for how long each IR panel is switched on.
This is where regulation comes in.

Standard Wi-Fi thermostats are not adapted for IR heating, as they operate with larger temperature delays – they switch on only when the room has already cooled too much, and switch off when it's already overheated. These constant temperature fluctuations reduce comfort and cause unnecessary energy consumption.

The IR Sun regulator, however, was developed exclusively for IR systems and operates responsively: it precisely and continuously dispenses heat, without unnecessary temperature jumps. The practical result is up to 25% lower energy consumption compared to a standard thermostat, with significantly greater thermal comfort.

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What enables efficient use of IR panels?

Ekosen IR panels are designed for maximum efficiency, operating in real conditions for an average of only 3 to 5 hours a day. Such low consumption is not a coincidence, but the result of advanced technology and the physical process of accumulation.

1. Heating surfaces, not air

Air is a poor heat accumulator and cools quickly when doors are opened. IR panels, however, deeply heat walls and floors, which retain heat significantly longer and radiate it back into the room long after the system is turned off.

2. No heat loss in distribution lines

In central heating systems, some energy is lost in pipe distribution lines before it even reaches the radiator. With IR panels, this is not the case – energy is converted directly into heat in the room where you need it.

3. Targeted heating

With the IR Sun regulator, you heat each room according to its own schedule and only when you are actually using it. The system maintains a constant temperature with smart micro-adjustments, which is significantly more economical than constantly cooling down and reheating rooms.

4. Achieving full thermal stability

Maximum savings occur when the system thoroughly dries out the walls, as dry walls are better insulators. Once the building reaches this thermal balance, energy consumption drops drastically, and your home begins to fully utilize the benefits of radiant heat.

Frequently asked questions about IR heating operation

The principles of solar heat and IR heat are related – both are based on IR radiation. The difference is in the spectrum: the sun emits a combination of IR, visible light, and UV radiation. IR panels emit exclusively long-wave IR-C spectrum, which is naturally harmless and is the part of solar radiation that we feel as heat. There is no UV radiation in IR heating.

An IR panel starts emitting heat immediately upon activation. However, since it doesn't heat the air, the thermometer doesn't show an immediate temperature rise – surfaces are heated first. The subjective feeling of warmth occurs within 5–10 minutes. The air temperature reaches the desired value in 15–30 minutes, depending on the size and insulation of the room.

The physical facts are undeniable: in buildings without thermal insulation (old stone houses, solid brick without a facade), we do not recommend IR heating as a primary source. If the walls do not retain heat, the energy consumption for maintaining a comfortable 22 °C would be economically unreasonable. At Ekosen, we strive for long-term customer satisfaction, which is why, after an energy calculation, we honestly tell you if your home even meets the conditions for economical and efficient system operation.

No. IR heating does not cause air circulation and does not heat it directly, therefore it does not lower the relative humidity of the air. Quite the opposite – because it dries walls and prevents condensation, air humidity in rooms with IR heating is often more stable than with convection systems.

None. An IR panel has no moving parts – no motor, no pump, and no fan. Since the system operates without liquids and high pressures, there are no elements that would eventually start leaking or wear out due to friction. It is a static device with an exceptionally long lifespan (up to 40 years) that operates throughout its entire period without any servicing.

Check how an IR system would work in your home

Every building is specific, which is why our consultants prepare a free energy calculation that accurately predicts the system's operation in your home. Start with real data.