Heating / Rex Nordic / Airrex
Airrex AH-900i diesel infrared heater for large marquees, halls and event structures
Airrex AH-900i
24 kW of radiant heat at full output for the biggest spaces you pitch, fed from a 70 L tank. Set it from your phone and let the thermostat do the rest.
Product overview
What the Airrex AH-900i is built to do
24 kW of radiant heat at full output for the biggest spaces you pitch, fed from a 70 L tank. Set it from your phone and let the thermostat do the rest.
Big heat, on your terms. Run it at 19 kW to hold a warm room and 24 kW to bring a cold one up to temperature.
Control from your phone. The Rex Nordic app works over WiFi, with optional 4G, so you can set the heat, timers and output from anywhere.
A 70 L tank. Runs on diesel (EN 590) or HVO (renewable diesel), with fewer fills across a long event.
Key product facts
Specification
| Heat output | 19 kW / 24 kW, selectable |
|---|---|
| Heated space | Up to 2,500 m³ |
| Fuel | Runs on diesel (EN 590) or HVO (renewable diesel) |
| Fuel use | 1.81 L/h (19 kW) · 2.3 L/h (24 kW) |
| Fuel tank | 70 L |
| Power supply | 230 V single-phase, 50 Hz |
| Power draw | 60 W running · 180 W during preheat and ignition |
| Temperature control | Thermostat 0–40 °C · 24-hour stop timer · 5–60 min interval timer |
| Controls | Soft-touch LED panel · Rex Nordic app over WiFi (2.4 GHz) or Bluetooth · optional 4G |
| Safety | Overheat protection · burner overheat sensor · flame sensor · tilt and vibration cut-out · low-fuel indicator · low-ventilation shutdown |
| Operating limit | Down to −20 °C |
| Noise level | 47–48 dB |
| Weight | 81 kg |
| Dimensions (W × D × H) | 1,300 × 350 × 1,400 mm |
| Warranty | 5-year manufacturer's warranty (with registration) |
| Price | £2,870 ex VAT (£3,444 inc VAT) |
Airrex specify well-ventilated spaces where the air is replaced 1–2 times an hour, never sealed rooms or rooms where people sleep. Keep 1.5 m clear in front of and above the heater. Your quote confirms the ventilation and clearances for your site.
Guide price
£2,870 ex VAT£3,444 inc VAT
Your quote comes back within 1 business day, with the right output for your space.
Get a QuoteSpeak to a specialistRex Nordic / Airrex
Why the Airrex earns its place
Over twenty years of engineering in one cabinet: Dual Power output you switch between 19 and 24 kW, app control over WiFi or 4G from anywhere, and no ducting needed in ventilated indoor spaces.
App control over WiFi, with optional 4G. Check and adjust the heat without walking the site.
Two selectable outputs. 11 or 15 kW on the AH-500i, and 19 or 24 kW on the AH-900i. Match the heat to the night.
70 L tank, larger than many comparable models. More hours between fills on a long event.
Approved for HVO. Runs on renewable diesel as well as standard diesel (EN 590).
Backed by the 5-year manufacturer's warranty (with registration) and UK support.
Common questions
FAQ
How big a space does the AH-900i heat?
Up to 2,500 m³. Heat is sized by volume, not floor area, so your dedicated specialist works from your structure's footprint, height and the season to set the right output.
What fuel does it run on?
It runs on diesel (EN 590) or HVO (renewable diesel). It uses 1.81 litres an hour at 19 kW and 2.3 litres at 24 kW, from a 70 L tank.
What power does it need?
A standard 230 V single-phase supply. It draws 60 W when running and 180 W during preheat and ignition.
Can it run in a marquee with guests inside?
Yes, in a ventilated structure. The air needs to be replaced 1–2 times an hour, with 1.5 m kept clear in front of and above the heater. If ventilation drops too low, the heater shuts itself down.
Discuss your job
Tell us what the job needs. A specified quote comes back within 1 business day.
Rex Nordic / Airrex
Confirm the setup
Tell us the space, the runtime and the access. Your specialist confirms the right specification within 1 business day.