Webasto Air Top EVO 40
WebAsto Air Top EVO 40 Diesel Luchtverwarmer Gebruikershandleiding
Model: Air Top EVO 40
1. Inleiding
This manual provides essential information for the safe and efficient operation, installation, and maintenance of your Webasto Air Top EVO 40 Diesel Air Heater. This unit is designed to provide reliable heating for RVs, trucks, and other vehicles. Please read this manual thoroughly before installation and use to ensure proper function and safety.
2. Product voorbijview en componenten
De Webasto Air Top EVO 40 kit includes the main heater unit and various components necessary for installation and operation. Familiarize yourself with all parts before proceeding.

Figuur 2.1: Overview van de Webasto Air Top EVO 40 Diesel Air Heater kit, showing the main heater unit, exhaust pipes, fuel pump, wiring harness, air ducts, and mounting hardware.
Belangrijke onderdelen zijn doorgaans:
- Air Top EVO 40 Heater Unit
- Brandstofpomp
- Brandstofleiding
- Exhaust Pipe and Silencer
- Combustion Air Intake Pipe
- kabelboom
- Montageplaat en hardware
- Air Ducting Components
3. Technische specificaties
The following table details the technical specifications for the Webasto Air Top EVO 40 diesel air heater. These values are crucial for proper installation and operation.

Figuur 3.1: Technical data for Webasto Air Top EVO 40 and EVO 55 models, including heat output, fuel type, voltage, power consumption, and dimensions.
| Parameter | Air Top EVO 40 D |
|---|---|
| Type approval: EMC | E1 00 0385 |
| Heat flow over control range [kW] | 1.5 naar 3.5 (4.0) |
| Brandstof | Diesel / biodiesel DIN EN 590 / DIN EN 14214 |
| Fuel consumption over control range [l/h] | 0.18 to 0.43 (0.49) l/h |
| nominale voltage [V] | 12 / 24 |
| Bedrijfsvolumetage bereik [V] | 10.5 naar 16 / 20.5 naar 31 |
| Rated power consumption over control range [W] | 15 naar 40 (55) |
| Permissible ambient temperature (operation/storage): Heater [°C] | -40 tot +40 / -40 tot +85 |
| Permissible ambient temperature (operation/storage): Fuel pump [°C] | -40 tot +20 |
| Permissible combustion air intake temperature [°C] | -40 tot +20 |
| Setpoint temperature range [°C] | +5 tot +35 |
| Volumetric flow rate with pressure loss in cold/hot air system 0.5 hPa [m³/h] | max. 132 (140) |
| CO₂ in exhaust gas: Rated heating capacity VL [vol%] | 9.2 |
| Heater length [mm] | 423 ± 2 |
| Heater width [mm] | 148 ± 1 |
| Heater height [mm] | 162 ± 1 |
| Heater weight [kg] | 5.9 |
| IP class: Heater | IP5K4K |
| IP class: Fuel pump | IPX6 / IPX7 / IP6K9K |
| Max. length of combustion air line and exhaust line with exhaust silencer [m] | 2 |
| Max. length of combustion air line and exhaust line without exhaust silencer [m] | 5 |
| Max. permissible pressure loss in cold and hot air system [hPa] | 2.0 |
4. System Functionality
De Webasto Air Top EVO 40 operates as a forced-air diesel heater. It draws in fresh air, heats it using a combustion process, and then circulates the warm air into the vehicle's interior. The system includes a glow plug for ignition, a fuel pump for precise fuel delivery, and a control unit to manage the heating process.

Figuur 4.1: Doorsnede view of the air heating system, illustrating key internal components such as the glow plug, combustion chamber, heat exchanger, impellers, control unit, and various sensors.
Key functional components include:
- Heater Housing: Encloses all internal components.
- Combustion Air Blower: Supplies air for the combustion process.
- Tubular Combustion Chamber: Where fuel is ignited and burned.
- Warmtewisselaar: Transfers heat from the combustion gases to the circulating air without mixing.
- Hot Air Blower: Circulates the heated air into the vehicle.
- Besturingseenheid: Manages all heater functions, including ignition, fuel delivery, and temperature regulation.
- Brandstofpomp: Delivers precise amounts of diesel fuel to the combustion chamber.
- Gloeibougie: Ignites the fuel-air mixture during startup.
5. Installatierichtlijnen
Proper installation is critical for the safe and efficient operation of your Webasto Air Top EVO 40 heater. It is recommended that installation be performed by a qualified technician. Always adhere to local regulations and manufacturer guidelines.
5.1. Typische toepassingen
The Air Top EVO 40 is versatile and can be installed in various vehicle types, including:
- Recreatievoertuigen (campers)
- Trucks and Commercial Vehicles
- Boats (with marine-specific installation kits)
- Bouwmachines

Figuur 5.1: Illustrative diagram of a Webasto heater installed in a van, showing the placement of the heater unit and the routing of warm air ducts within the vehicle interior.

Figuur 5.2: Illustrative diagram of a Webasto heater installed in a loader vehicle, indicating the heater unit's position and the distribution of heated air within the cabin.
5.2. General Installation Considerations
- Montage locatie: Choose a dry, protected location, typically under the vehicle, in a storage compartment, or within the cabin, ensuring adequate clearance for air intake and exhaust.
- Brandstoftoevoer: Connect the fuel pump to the vehicle's diesel tank or a dedicated fuel tank. Ensure all fuel lines are securely fastened and free from leaks.
- Elektrische aansluiting: Connect the heater to a 12V or 24V DC power source as specified for your model. Ensure proper fusing and wiring according to the provided wiring diagram.
- Air Ducting: Install the warm air ducts to distribute heat effectively throughout the desired area. Ensure ducts are not kinked or obstructed.
- Uitlaatsysteem: Route the exhaust pipe safely away from flammable materials and passenger areas. Ensure proper sealing to prevent exhaust fumes from entering the vehicle.
- Combustion Air Intake: Ensure the combustion air intake is clear of obstructions and draws in fresh air from outside the vehicle.
6. Gebruiksaanwijzing
Het bedienen van de Webasto Air Top EVO 40 is straightforward using the control unit. The specific control panel may vary, but general functions remain consistent.

Figuur 6.1: Example van een Webasto control knob, typically used for turning the heater on/off and adjusting the desired temperature.
6.1. De verwarming starten
- Ensure the vehicle's battery is adequately charged and there is sufficient diesel fuel.
- Turn the control knob or press the power button on your control panel to the 'ON' position or desired temperature setting.
- The heater will initiate a startup sequence, which includes a self-test, glow plug activation, and fuel pump priming. This process may take a few minutes.
- Once combustion is stable, warm air will begin to flow from the air outlets.
6.2. Temperatuur aanpassen
Use the control knob or digital interface to set your desired temperature. The heater will automatically adjust its heat output to maintain the set temperature.
6.3. De verwarming uitschakelen
- Turn the control knob or press the power button to the 'OFF' position.
- The heater will enter a cool-down cycle to prevent overheating and clear the combustion chamber. Do not disconnect power during this cycle.
- Once the cool-down cycle is complete (indicated by the fan stopping), the heater is safely shut down.
7. Onderhoud
Regelmatig onderhoud zorgt voor een lange levensduur en optimale prestaties van uw Webasto Air Top EVO 40 heater. Perform these checks periodically.
- Jaarlijkse inspectie: Have the heater inspected by a qualified technician at least once a year, preferably before the heating season.
- Luchtinlaat en uitlaat: Regularly check that the combustion air intake and exhaust pipes are clear of obstructions (e.g., dirt, ice, debris).
- Air Ducts: Ensure the warm air ducts are clean and free from blockages.
- Elektrische aansluitingen: Controleer alle elektrische aansluitingen op dichtheid en corrosie.
- Brandstofsysteem: Inspect fuel lines for leaks or damage. Ensure the fuel filter (if installed) is clean.
- Algemene schoonmaak: Keep the exterior of the heater unit clean. Do not use harsh chemicals.
8. Probleemoplossing
This section provides solutions for common issues you might encounter with your Webasto Air Top EVO 40 heater. For complex problems, contact Webasto authorized service.
| Probleem | Mogelijke oorzaak | Oplossing |
|---|---|---|
| Kachel start niet | Batterij bijna leegtage Geen brandstof Doorgebrande zekering Defecte bedrading | Controleer de batterijlading Brandstofpeil controleren Inspect and replace fuse Controleer de bedrading |
| Heater starts but shuts down quickly | Onvoldoende brandstoftoevoer Blocked exhaust or air intake Oververhitting | Check fuel lines and pump Clear obstructions from exhaust/intake Ensure proper ventilation around heater |
| No warm air output | Ventilator defect Verstopping van het luchtkanaal | Neem contact op met de servicemonteur Check and clear air ducts |
| Overmatige rook of ongebruikelijke geur | Improper combustion Brandstoflek | Immediately shut down heater and contact service. Do not operate. |
9. Ondersteuning en garantie
For technical assistance, spare parts, or warranty claims, please contact Webasto customer support or an authorized Webasto service center. Refer to your purchase documentation for specific warranty terms and conditions.
Webasto Official Webwebsite: www.webasto-group.com
Always use genuine Webasto spare parts to ensure the safety and performance of your heater.
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