How Does A Webasto Air Top Heater Work?

Starting the heater

When the unit is switched on the dosing pump feeds fuel from your vessel’s fuel tank to the heater.

Here, the fuel is automatically ignited by means of a glow plug. If combustion does not occur immediately, the unit automatically repeats the start-up procedure.

Combustion

In the combustion chamber a flame is lit which heats up the heat exchanger.

The unit takes air in from outside for combustion purposes and the combusted exhaust air is discharged back outside.

Heating

During heating, the integrated fan sucks in the air to be heated through the inlet and feeds it through the unit. As the air flows through the heat exchanger it is heated up and is then distributed through the outlet.

The connected hot air ducting spreads the air evenly throughout the vehicle or boat interior.

Due to the unit’s separation of the combustion cycle from the heating cycle there is no quality impairment of the hot air.

Regulating the temperature

A temperature sensor constantly measures the interior temperature and adapts the heating level by automatically adjusting the amount of air passing through the unit.

In this way, the temperature selected by the user is rapidly reached and maintained at a constant level.

Switching off a Webasto Air Top heater

After the unit has been switched off, the combustion process is terminated in a controlled manner.

For this purpose the unit briefly goes into re-run mode to cool itself down.

It is then immediately ready for restarting.

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