Operated by Eggenberg & D'Orly
Infrared vs Hot-Air Heaters: Which Is Right for Your Workspace?
When it comes to heating a workshop, warehouse or hall, two approaches dominate: infrared (radiant) heaters and hot-air (convection) heaters. They both keep people warm, but they do it in fundamentally different ways — and that difference has a big impact on comfort, running costs and which spaces they suit. Here is a clear, practical comparison.
How each type works
A hot-air heater warms the air. A burner or element heats air, a fan blows it into the room, and that warm air raises the overall air temperature. It is the same principle as central heating.
An infrared heater works more like the sun. Instead of heating the air, it emits infrared radiation that travels through the space and warms the floors, walls, machinery and people it lands on directly. Those surfaces then release the warmth back into the room. You feel the heat almost immediately, even while the air is still cool.
The case for infrared
Because infrared heats objects rather than air, it has some clear advantages in professional settings:
Less wasted energy. Warm air rises. In tall or open buildings, hot-air systems often heat the ceiling before they warm workers at floor level. Infrared puts the heat where people actually are, which can cut energy use by up to around 30%.
Instant, even warmth. There is no waiting for the whole room’s air to warm up — you feel radiant heat within a couple of minutes.
Ideal for open and draughty spaces. Loading bays, high-ceiling halls, workshops with doors that open regularly, covered outdoor areas — anywhere air escapes easily, infrared keeps working because it is not relying on trapped warm air.
Cleaner and quieter. With no fan blasting air around, there are no draughts stirring up dust, and quality units run very quietly. That makes infrared well suited to workshops, showrooms and events.
When hot-air can still make sense
Hot-air heaters are not obsolete. In a small, well-sealed and well-insulated room where you want a uniform air temperature throughout — an office or a closed store room, for example — convection can work perfectly well, and it warms the air itself rather than just surfaces. If your priority is a consistent ambient air temperature in an enclosed space, hot-air is a valid choice.
Running costs and comfort
For most industrial and semi-open spaces, infrared usually wins on efficiency because it avoids the biggest weakness of convection: heat escaping upward and out of open doors. Lower thermostat settings, targeted “spot” heating and immediate warmth all add up to lower fuel bills over a season. Comfort tends to favour infrared too — people feel the direct warmth quickly, without a draught.
The verdict
If you are heating a workshop, warehouse, agricultural building, event tent or any tall, open or draughty space, infrared is almost always the smarter choice — faster, more efficient and more comfortable. Hot-air still has a place in small, sealed rooms where uniform air temperature is the goal.
WELTEM diesel infrared heaters are built for exactly the demanding, open, professional spaces where infrared performs best: whisper-quiet at 32 dB, odourless, biodiesel-ready and available in five sizes from 750 m³ up to 4,680 m³. Not sure which fits your space? Explore the range or ask our team for advice.