Webasto Air Top Evo 40 Heater

The Webasto Air Top Evo 40 is a compact and powerful air heater, designed to efficiently heat converted vans, RVs, trucks, and adventure vehicles, even in harsh weather conditions. Available in diesel or gasoline versions, this heater adapts to your engine while offering excellent thermal efficiency, low fuel consumption, and quiet operation.

With power up to 13,600 BTU/h (4.0 kW), the Air Top Evo 40 is ideal for larger spaces or users traveling in cold climates or at altitude.

A high-performance heater, even in extreme conditions

The Webasto Air Top Evo 40 is designed to operate reliably:

• In very cold weather

• At high altitude (automatic compensation up to 2,200 m / 7,200 ft)

• Without leaving the engine running unnecessarily

It provides fast and consistent heat, directly inside the cabin, while using the vehicle's fuel (diesel or gasoline depending on the version).

Quiet, economical, and autonomous

• Very quiet operation, ideal for comfortable sleeping

• Low fuel consumption (up to ~3.8 L over 22 hours depending on use)

• Very low electrical consumption (12 V DC)

• Eliminates the need to leave the engine idling to heat up

Result: an energy-efficient heater, cost-effective in the long run and perfectly suited for vanlife.

SmarTemp 3.0 smart thermostat included

Each Air Top Evo 40 is compatible with the SmarTemp 3.0 thermostat, known for its simplicity and reliability.
The system is designed to be:

• Easy to use

• Programmable

• Stable and precise

Once set, the heater automatically maintains the desired temperature without constant intervention.

Flexible installation

The Webasto Air Top Evo 40 offers several installation options depending on your setup:

• Inside the vehicle

• In double floor

• Under the vehicle (underbody)

⚠️ Important note: some installation accessories (e.g., OEM tank connection kit) may be required depending on the vehicle and are not included.

Main features

• Autonomous air heater for camper vans and RVs

• Available in diesel or petrol

• Maximum power: 13,600 BTU/h (4.0 kW)

• Operates without running the engine

• Very low electric consumption

• Quiet operation for peaceful sleep

• Automatic altitude compensation

• Compact and robust design

• Proven Webasto quality

• CARB approved and EPA SmartWay certified

• Full diagnostics available via PC interface

Technical specifications – Air Top Evo 40

General data

• Voltage: 12 V DC

• Fuel type: Diesel or Petrol (depending on variant)

• Warranty: 2 years

Performance

• Heating power: 1.7 – 3.5 / 4.0 kW

• Thermal power: 13,600 BTU/h (4.0 kW)

• Fuel consumption: 0.25 – 0.51 / 0.54 L/h

• Electric consumption: 15 – 40 / 55 W

• Heated air flow (0.5 mbar): 132 – 140 m³/h

• Operating temperature range: -40 °C to +40 °C

• Automatic altitude compensation: up to 2,200 m

Dimensions & weight

• Dimensions (L x W x H): 423 x 148 x 162 mm

• Weight: 5.9 kg (13.01 lb)

Why choose the Webasto Air Top Evo 40?

The Webasto Air Top Evo 40 is one of the most popular heaters for vanlife thanks to its perfect balance of power, quietness, reliability, and energy efficiency. Whether you run on diesel or petrol, it offers a premium autonomous heating solution designed for serious travelers and professional conversions.