Heating / Rex Nordic / Airrex
Airrex AH-500i diesel infrared heater for marquees, workshops and event structures
Airrex AH-500i
Radiant warmth that reaches your guests and crew straight away, at 11 or 15 kW. Set the temperature once, from the panel or your phone, and the thermostat holds it all night.
Product overview
What the Airrex AH-500i is built to do
Radiant warmth that reaches your guests and crew straight away, at 11 or 15 kW. Set the temperature once, from the panel or your phone, and the thermostat holds it all night.
Two outputs, one heater. Run it at 11 kW for a cool spring evening and switch to 15 kW when the frost comes in.
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.
Fuel you can buy anywhere. Runs on diesel (EN 590) or HVO (renewable diesel). The 45 L tank goes on long between fills.
Key product facts
Specification
| Heat output | 11 kW / 15 kW, selectable |
|---|---|
| Heated space | Up to 1,500 m³ |
| Fuel | Runs on diesel (EN 590) or HVO (renewable diesel) |
| Fuel use | 1.05 L/h (11 kW) · 1.42 L/h (15 kW) |
| Fuel tank | 45 L |
| Power supply | 230 V single-phase, 50 Hz |
| Power draw | 50 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 | 47 kg |
| Dimensions (W × D × H) | 950 × 305 × 1,080 mm |
| Warranty | 5-year manufacturer's warranty (with registration) |
| Price | £2,170 ex VAT (£2,604 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
£2,170 ex VAT£2,604 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 11 and 15 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.
A 45 L tank. It goes on long between fills.
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-500i heat?
Up to 1,500 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 1.05 litres an hour at 11 kW and 1.42 litres at 15 kW.
What power does it need?
A standard 230 V single-phase supply. It draws 50 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.