Cleaner. Cheaper.
Smarter. Better.
Discover the biggest revolution in heating since fire.
Powerful diesel performance, without the hassle.
No exhaust pipe. No diesel odour. Airrex diesel infrared heaters deliver strong, efficient heat for large areas through clean-burning technology that removes the usual drawbacks of conventional diesel units.
The triple-stage combustion system burns fuel with such efficiency that more than 99% of the output is only CO₂ and water vapor. The result is odourless, smoke-free operation suited to warehouses, workshops, construction environments, and agricultural buildings where air quality is critical.
With heat outputs from 13–22 kW and fuel use of just 0.9–1.9 liters per hour, these heaters offer high value for spaces up to 2000 m³, especially where electrical supply is limited or costly. Ceramic-coated heat exchangers keep noise to a low 48 dB while distributing infrared warmth evenly in every direction.
Airrex units run on standard diesel or renewable HVO, raising indoor temperatures to as high as +40 °C even in severe cold. They come in three sizes and include a 2-year warranty, extendable to 3 years with online registration.
AH-200i
Ideal for greenhouses, garages, and terraces.
| Up to 900m³ coverage |
| 13 kW heat capacity |
| 25L fuel capacity |
| 40kg dry weight |
AH-300i
Perfect fit for workshops, halls, warehouses and event tents.
| Up to 1500m³ coverage |
| 15 kW heat capacity |
| 45L fuel capacity |
| 46kg dry weight |
AH-800i
Great match for larger spaces including warehouses and tents.
| Up to 2000m³ coverage |
| 22 kW heat capacity |
| 70L fuel capacity |
| 81kg dry weight |
Works anywhere, just plug in and go.
Warehouses & Industrial Halls
Designed for demanding conditions. Airrex functions reliably as an industrial heater for production halls, storage facilities, and large indoor environments, even in poorly insulated spaces.
Workshops & Repair Shops
Dependable workshop heater for mechanics, technicians, and repair professionals. Airrex provides consistent, clean heat for service bays, tool shops, and machinery work areas, with no installation needed.
Barns, Storage & Agricultural Buildings
Airrex diesel heaters deliver efficient heat for barns, storage buildings, and machinery sheds, and they also work well as greenhouse heaters during colder seasons. A versatile option for agricultural environments.
Temporary Structures & Tents
Diesel heaters are ideal for marquees, event tents, inspection stations, and other temporary setups. Portable and fast to heat, they suit both short-term and seasonal applications.
Construction Sites & Logistics Hubs
Airrex heaters serve as robust mobile heating solutions for construction sites, loading areas, and logistics centers. They’re portable, fast to deploy, and perform efficiently in large or open environments.
Garages and Hobby Spaces
The diesel heater is perfect for garages, hobby rooms, and DIY spaces where you work on cars, motorcycles, crafts, or repairs. Airrex delivers clean, efficient warmth without fumes or exhaust pipes.
The obvious choice for your heating needs.
No installation, no exhaust
Airrex diesel heaters work without a dedicated exhaust line or permanent setup, allowing rapid setup and use.
Mobile & Muted
Fitted with castor wheels, Airrex heaters can be easily relocated. Their fanless infrared system reduces dust movement and runs quietly at only 48 dB, about as loud as a fridge.
Scentless heat
Airrex heaters use catalytic combustion that eliminates the usual burning odour, allowing safe indoor operation without affecting air quality.
Kind to your wallet
Airrex draws only 80 W of electricity while operating, which is less than a typical light bulb. Over time, this leads to significant energy savings.
Multi-fuel ready
Airrex heaters run on any type of diesel, whether that be from a fuel station, or eco-friendly renewable diesel (HVO), letting you pick the fuel that suits your needs.
Adjustable thermostat
Use the integrated thermostat to set any indoor temperature from 0 to 40 °C. The heater then holds that temperature automatically with efficient regulation.
Smarts where you need it
Airrex heaters can be operated remotely via WiFi or the optional 4G module. The heaters also function completely offline for use in isolated locations.
Safety & Auto-Restart
Airrex heaters automatically restart after power loss and include 12 safety features, such as overheat protection and tilt detection.
Built to last
A robust protective grid, efficient internal design, and a graphite grey exterior with a mirrored control panel provide both durability and a sleek, professional appearance.
Questions? We have answers.
Do diesel infrared heaters use a lot of electricity?
No, Airrex oil heaters consume roughly 80 W, just enough for the LED display, fuel pump, and ignition – comparable to a standard lightbulb.
How much diesel do Airrex infrared heaters use?
Efficiency varies by model and usage, whether keeping a set temperature or warming a cold area. Each Airrex heater has a thermostat that halts heating once the target temperature is reached and resumes it when it drops slightly, ensuring economical operation.
Maximum diesel consumption per hour:
- AH-200i: 0.95-1.14 l/h
- AH-800i: 1.7-1.90 l/h
- AH-300i: 1.14-1.33 l/h
Are Airrex heaters expensive to run? What’s the cost per hour?
Operating costs are determined by diesel price and usage. At £1.60/l, running an AH‑800i for 1.5 hours daily uses about 2.8 liters, costing £4.48 per day—or around 18.6 pence per hour—while providing roughly 30 kW of heat.
What area can the Airrex diesel infrared heater heat?
Coverage differs by model: the AH‑200i reaches up to 900 m³, the AH‑300i up to 1,500 m³, and the AH‑800i up to 2,000 m³. Real-world results vary with insulation, outside temperature, and ventilation.
Is it possible to hang the Airrex heater from the ceiling?
No, Airrex heaters are not intended for ceiling mounting or suspension.
Are Airrex heaters harmful to plants or animals?
Not when used properly. In areas with animals or plants, exhaust must be vented outside via a flue, and adequate fresh air must be provided.
Is it safe to leave the Airrex heater running overnight?
Yes, but only when all manual safety guidelines are followed: position the heater with proper clearance from walls and combustibles, ensure sufficient ventilation, and avoid using the area for sleeping.
How do infrared diesel heaters like the Airrex range work?
Airrex diesel heaters combust fuel in a sealed tube chamber, generating safe infrared heat that warms the air and nearby surfaces. The efficient process is essentially odourless and smoke-free.
Do I need to fit a permanent exhaust pipe to use the Airrex heaters?
Airrex diesel infrared heaters employ triple combustion technology, burning fuel so cleanly that most applications don’t need an exhaust pipe, producing only harmless CO₂ and water vapor.
How is it possible that there is no exhaust pipe needed? Are Airrex heaters safe to run without an exhaust pipe?
Airrex heaters achieve full combustion through a triple‑burn process, resulting in exhaust that is both odourless and smoke-free. In a building that is ventilated properly up to UK building code standards, dangerous emissions are not produced. However, the heater should never be used in a sleeping space.
What is an infrared heater, and how does it differ from traditional diesel heaters?
Unlike traditional diesel heaters that rely on fans, infrared heaters warm objects and surfaces directly like the sun does, providing even, comfortable heat without drafts, air movement, or fan noise.
Are Airrex diesel heaters loud? Won’t it be distracting to share a room with?
Airrex diesel infrared heaters run at just 48 dB, similar to a quiet conversation, making them much quieter than traditional fan-driven diesel heaters.
Not convinced? Let us reassure you.
Up to 3 years warranty
Airrex diesel heaters come with a standard 2-year warranty. By registering your product online, you can extend the warranty by an additional year, enjoying a total of 3 years of coverage!
Fast delivery, ready-to-run
Order from us directly and we’ll deliver your heater within 7-10 days, across our coverage area – or put you in touch with your local dealer. All products sold by us directly come fully assembled and ready to work, and are demonstrated to you onsite.
Support if you need it
Our phone lines are open 5 days a week, backing you up with any support you need – and you can order spare parts or book in your heater for service with us directly, and enjoy priority support as our customer.