The technical spec of the MV Airo 2kw heater states that the power consumption is 14-29 Watts
Once the set temperature is reached in your van it only consumes around 14 watts to maintain it… so it'll really not be much of a draw on your battery.
Here are some more details from the tech spec:
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Output: 2000W
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Fuel: Diesel
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Voltage: 12v
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Fuel consumption: 0.12 - 0.24 L/hr
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Rated Power Consumption: 14-29 W
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Weight: 2.6Kg
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Dimensions: 323 x 120 x 121 mm