Comparison Between Shortwave and Longwave Radiant Heating
Comparison Between Shortwave and Longwave Radiant Heating
Radiant heating is an efficient and comfortable heating solution that works through infrared radiation. However, not all radiant heaters are the same: they mainly differ in the wavelength of their radiation. The main distinction is between shortwave and longwave radiant heaters. Each of these systems has advantages and disadvantages depending on the intended application.
1. Shortwave Radiant Heating
Operating Principle
Shortwave heaters use heating elements at very high temperatures (1,500-2,500 °C), producing infrared radiation close to visible light. This type of heating is very powerful and directly heats objects and people without significantly increasing the ambient temperature.
Advantages
- Instant heating: heat is felt within seconds.
- Ideal for outdoor use: effective even in windy environments.
- High power: capable of heating large open areas.
Disadvantages
- Visible red light: some users find it unaesthetic.
- Different thermal comfort: can create a sensation of intense but localised heat.
- High energy consumption: not always the most economical solution.
Main Applications
- Heating terraces and outdoor spaces
- Industrial areas and open warehouses
- Storage halls and large spaces
2. Longwave Radiant Heating
Operating Principle
Longwave heaters operate at a lower temperature (100-300 °C) and emit longwave infrared radiation, which is more similar to the natural warmth of the sun. This radiation heats surfaces and objects, which then redistribute the heat into the surrounding air.
Advantages
- Gentle and even heat: gradually warms walls, furniture, and ambient air.
- No visible light: discreet integration into indoor spaces.
- Energy efficiency: consumes less energy than shortwave heaters in indoor spaces.
Disadvantages
- Slower heating: takes several minutes to feel a noticeable warmth.
- Less effective outdoors: sensitive to air currents and heat loss.
- Wall or ceiling installation recommended: to maximise heat distribution.
Main Applications
- Heating indoor spaces (living rooms, offices, bedrooms)
- Offices and commercial spaces
- Supplementary heating in well-insulated areas
3. Which Solution to Choose Based on Your Needs?
The choice between shortwave and longwave radiant heating mainly depends on the intended use:
| Criteria | Shortwave Heating | Longwave Heating |
|---|---|---|
| Heating time | Immediate | Gradual |
| Thermal comfort | Direct and intense heat | Gentle and even warmth |
| Outdoor use | Highly effective | Not suitable |
| Indoor use | Less comfortable | Ideal |
| Energy consumption | Higher consumption | More economical |
| Aesthetics | Visible red light | Invisible |
Shortwave radiant heating is perfect for outdoor and industrial spaces, where instant heat is required. On the other hand, for indoor and residential use, longwave heaters offer better thermal comfort and greater energy efficiency.
Before purchasing a radiant heater, it is essential to evaluate your needs based on your environment and intended use to choose the most suitable solution.