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    How does a fuel-operated car heater work in winter?

    An alternative to the block heater.

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    Short answer

    A fuel-operated auxiliary heater (polttoainetoiminen lisälämmitin) burns the car's own fuel to warm the engine, and usually the cabin too, so it does not need a power socket. Autoliitto told MTV Uutiset that at temperatures down to minus 5 °C about 15 minutes is enough. Another MTV Uutiset article gives 20 to 30 minutes when it is colder than minus 10 °C. The heater uses the car battery, so it should not be run for too long.

    Transport, roads, car rental

    Why

    1. Autoliitto gives about 15 minutes at down to minus 5 °C.
    2. Below minus 10 °C, 20 to 30 minutes is enough, according to MTV Uutiset.
    3. The heater draws power from the car battery.

    Details

    On short drives the battery may not recharge enough, so Moottori suggests considering a maintenance charger if you use the heater often.

    Tip

    Use the heater's timer or app rather than starting it much earlier than needed.

    What may differ

    Fuel-operated heaters are less common in new cars than before because of emission rules, according to Taloustaito.

    Common misconception

    A fuel heater can run all night without problems.

    What actually happens

    It drains the battery, so long use can leave the car unable to start.

    People also ask

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    • When are winter tyres required in Finland?

    Sources

    This answer is for reference only. Traffic rules and fees change, so check Traficom, Liikenneturva or the police before you drive.

    Transport, roads, car rental

    • Do foreign cars need a country sticker in Finland?

      The Automobile and Touring Club of Finland says a nationality sign is required on foreign cars in Finland, unless the vehicle is registered in a country that is party to the Geneva or Vienna Road Traffic Convention and carries EU number plates with the country code.

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    • What colour are motorway and main road signs in Finland?

      The Automobile and Touring Club of Finland (Autoliitto) says main roads in Finland have blue direction signs with white text, while motorways have green signs with white text.

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    • Does E10 petrol increase fuel consumption?

      VTT Technical Research Centre of Finland tested six used E10-compatible cars from model years 1999–2010 in laboratory conditions in 2011.

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    • Which petrol should you use in Finland, 95E10 or 98E5?

      Finnish pumps sell two main petrol grades: 95E10, with an octane rating of at least 95 and up to 10% ethanol, and 98E5, with at least 98 octane and up to 5% ethanol.

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