Diesel heaters
Powerful, mobile heating for any location
The diesel heater that changes everything
No exhaust pipe. No diesel smell. No ventilation required. Airrex diesel infrared heaters deliver powerful, efficient heating for large spaces using clean-burning technology that eliminates every downside of traditional diesel heating.
Our advanced triple combustion process burns fuel so cleanly that over 99% of the exhaust is harmless CO2 and water vapor. This means odorless, smoke-free operation, perfect for warehouses, workshops, construction sites, and agricultural buildings where air quality matters most.
With heating capacities from 13-22 kW while consuming just 0,9-1,9 liters of fuel per hour, these heaters provide exceptional value for large spaces up to 2000 m³ where electric power is limited or expensive. The ceramic-coated heat exchangers operate quietly at only 48 dB while distributing infrared heat evenly in all directions.
Airrex heaters run on standard diesel or renewable HVO fuel, raising indoor temperatures up to +40 °C even in extreme cold. Available in three sizes with a 2-year warranty that extends to 3 years when you register online.
AH-200i
Best suited for heating spaces like terraces,
garages and greenhouses.
| Spaces up to 900m³ |
| 13 kW |
| 25 L Fuel Tank Volume |
| Weight: 40kg |
| 78 x 31 x 95 cm (W x D x H) |
AH-300i
Best suited for heating
spaces like workshops, halls,
warehouses, event tents, and terraces.
| Spaces up to 1500m³ |
| 15 kW |
| 45 L Fuel Tank Volume |
| Weight: 46kg |
| 95 x 31 x 101 cm (W x D x H) |
AH-800i
Best suited for heating large spaces, such as workshops, halls, warehouses, and event tents.
| Spaces up to 2000m³ |
| 22 kW |
| 70 L Fuel Tank Volume |
| Weight: 81kg |
| 130 x 35 x 134 cm (W x D x H) |
where to use airrex heaters
industrial halls & warehouses
Designed for demanding environments. Airrex works perfectly as an industrial heater for production halls, storage buildings, and large indoor facilities, even in spaces with poor insulation.
Construction & logistics
Airrex units function as powerful mobile heaters on construction sites, loading bays, and logistics hubs. Easy to move, quick to set up, and effective even in large or open spaces.
Workshops & repair shops
Reliable workshop heater for mechanics, technicians, and repair professionals. Airrex delivers steady, clean heat to vehicle service bays, tool shops, and machinery work areas, with no installation required.
Agricultural buildings
Airrex diesel heaters provide efficient heating for barns, storage buildings and machinery sheds, and are suitable for use as a greenhouse heater in colder seasons. A multifunctional choice for agricultural conditions.
Garages & hobby spaces
Diesel fuel heater is ideal for garage environments, hobby rooms, or DIY spaces where you work on cars, motorcycles, crafts, or repairs. Airrex provides clean, efficient heat without exhaust pipes or odors.
Temporary structures & tents
Diesel heaters are perfect for marquees, event tents, inspection points, or other temporary structures. Easy to move and quick to warm up, they’re perfect for both short-term and seasonal use.
Why choose AIRREX diesel heaters?
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NO EXHAUST OR INSTALLATION
Airrex diesel heaters do not require a fixed exhaust pipe or any permanent installation. This makes them quick to deploy.
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LOW POWER USE
Airrex uses just 80W of electrical power when heating, lower than most light bulbs. This results in major energy savings over time.
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AUTO RESTART & SAFETY
Airrex restarts automatically after a power outage and features 12 advanced safety systems, including overheat protection and tilt sensors.
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ODOR-FREE HEATING
Thanks to advanced catalytic combustion, Airrex heaters don’t emit burning smells and can be safely used indoors without compromising air quality.
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MULTI-FUEL READY
Choose the fuel that fits your needs. Airrex heaters are compatible with standard diesel, red diesel, or eco-friendly renewable diesel (HVO).
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MOBILE & QUIET
Equipped with castor wheels, Airrex heaters are easy to move where needed. The infrared heating system works without a fan, minimizing dust circulation, and operates at just 48 dB.
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ADJUSTABLE TO +40 °C
Easily control the indoor temperature between 0 and 40 °C using the built-in thermostat. The unit maintains your set temperature automatically and efficiently.
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WIFI OR OFFLINE USE
Control your heater remotely with WiFi or 4G modules (optional). Airrex also works fully offline, ideal for disconnected environments.
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DURABLE & STYLISH
A strong protective grid, optimized internal systems, and a graphite grey finish with a mirror-finish control panel ensure durability and a professional look.
accessories
All original Airrex and Rex Nordic spare parts are available in our stock. Warranty maintenance is always carried out at the customer’s premises—simple and carefree!
2+1 warranty
All our products 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
Order directly from our online store, and we’ll deliver it to you within 1–5 days across Europe. Enjoy quick, hassle-free shipping to get what you need—fast and efficiently!
How it works
Infrared heating technology
Catalytic combustion
Thermostat-controlled operation
No fan - silent & dust-free
Remote control
User TESTIMONIALS
FAQ's
No. Airrex oil heaters only use electricity for the LED display, the fuel pump, and ignition. Power consumption is about 80 W during heating.
Our diesel infrared heaters work with renewable diesel (HVO), standard automotive diesel, and agricultural red diesel. For optimal performance in temperatures below 10°C, we recommend using winter-grade fuel.
It depends on the model and usage, whether you are maintaining a set temperature or heating a cold space. Each Airrex heater has a thermostat that stops the burning process once the desired temperature is reached and restarts it when the temperature drops a few degrees. This makes them very economical.
Maximum diesel consumption per hour:
AH-200i: 0.95-1.14 l/h
AH-300i: 1.14-1.33 l/h
AH-800i: 1.7-1.90 l/h
The running cost mainly depends on diesel price and usage time. For example, if diesel costs €1.60/l and an AH-800i runs for 1.5 hours per day, it will consume approximately 2.8 liters per day. That equals €4.48 per day, or roughly 18.6 cents per hour. In that time, the AH-800i delivers around 30 kW of heat energy.
It depends on the location. In well-ventilated workshops or similar spaces, it’s possible. However, the heater must never be used in sleeping areas.
Coverage varies by model: AH-200i heats up to 900m³, AH-300i up to 1500m³, and AH800i up to 2000m³. Actual performance depends on insulation quality, ambient temperature, and ventilation levels.
No. Airrex heaters are not designed to be mounted or suspended from the ceiling.
Yes, when used correctly. If heating spaces with animals or plants, the exhaust gases must be directed outside through a flue, and there must be a sufficient supply of fresh air.
Yes, but only if all safety precautions in the manual are followed. Ensure the heater is placed correctly with enough distance from walls or combustible materials, there is adequate ventilation, and the area is not used for sleeping.
Airrex diesel heaters burn diesel in a closed, tube-type combustion chamber, producing safe infrared heat that warms both the surrounding air and nearby objects. The highly efficient combustion process is virtually odor-free and produces no visible smoke.
No, Airrex diesel infrared heaters use advanced triple combustion technology that burns fuel so cleanly that exhaust pipes are not required for most applications. The combustion produces only harmless CO2 and water vapor.
Airrex heaters use a triple-combustion process that ensures complete burning. As a result, exhaust fumes are odorless and smokeless.
Traditional diesel heaters blow hot air using fans, while infrared heaters warm objects and surfaces directly. This creates more comfortable, even heating without air circulation, drafts, or noise from fans
Airrex diesel infrared heaters operate at only 48 dB – equivalent to a quiet conversation. This is significantly quieter than traditional diesel heaters with fans and blowers
Airrex diesel heaters in action
Airrex AH-300 helped cut a garage’s costs significantly
Two years ago, Riku Turunen from Kontiolahti was considering the heating costs of his industrial hall. It consumed a lot of power and the bills really reflected that. Things had to change in a sensible manner. Riku’s garage hall is...
Flower friendly Airrex AH-300 infrared heater solves greenhouse heating problem
Three years ago, at the Munkkivuori Garden, it was considered how the premises would be kept warm and the flowers happy. The gas heater didn’t work, but the diesel-powered Airrex AH-300 was chosen as the right heating solution. The garden...
Terrace heater, hall heater and BBQ hut heater – Airrex AH-300
Harry Mäkelä has an impressive terrace in his house. Mäkelä uses his grill a lot in winter, so the Airrex infrared heater may be switched on from Friday until Saturday. “We used to use this duct-shaped fuel oil heater....
Melting snow and ice with Airrex AH-800 heater
Founded in 1995, Amados Oy is specialised in the marketing and sales of machines related to construction, agriculture and property maintenance in Finland and Russia. The heater Airrex AH-800 was acquired to heat Amados’ workshop hall approximately 2.5 years ago,...