Does A Car Heater Use Gas?

Most vehicles nowadays have air conditioning as a choice to add on. However, for people living in places where the temperature can drop below freezing, the car’s heater is an essential component for driving.

A heater provides warmth for your cabin. The cozy air blowing onto your face, warming your feet, or clearing your windshield? It all comes from the identical source: the engine.

But does a car heater use fuel? And would you be better off turning the heater off to conserve gas? Here’s everything you need to know.

How Does The Car Heater Work?

The car heater is an extremely straightforward device in principle. All it does is recycle the heat put out from the engine. Instead of losing it to the atmosphere, it can be used to warm up the cabin. Simple!

You’ll probably know about coolant. Coolant flows through your engine, driven by a water pump. Its principal function is to regulate the temperature, but it also helps the motor warm up faster.

Once this coolant gets warm enough, the thermostat will open, forcing it to flow through the radiator at the front. This prevents it from cycling out of control, maintaining an optimal engine temperature of around 200 degrees F.

This system also includes a heater matrix, otherwise known as a heater core. The heater matrix is a sort of mini-radiator at the back of the engine bay near the cabin. The coolant passes through this, warming it.

Air then passes across it. The heat transfers from the heater matrix and warms the air, passing through the vents and into the cabin.

Does A Car Heater Use Gas?

Like air conditioning, a car heater doesn’t directly consume gasoline. However, forcing it to warm up rapidly or using it at maximum power can indirectly lead to slightly worse fuel economy.

Here are a couple of ways using your automotive heater can lead to decreased mpg.

• Fan speed – the fans draw the air across the heater matrix. The faster the fans are spinning, the more hot air will come in through the vents. However, they put a not-insignificant electrical load on the car. Fans set to maximum speed will be drawing a lot of current – even as much as a 500-Watt stereo! As the electrical system works harder, this could lead to a temporary reduction in fuel economy.
• Forcing the car to warm up quickly – on a cold morning, you’ll naturally want the car to warm up as fast as possible. The best way to do this is to slightly raise the revs (to not more than 2,000 rpm). While this forces the engine to get hotter at a reasonable pace, you’ll use more fuel than at idle. (If you’re driving while doing this, it’ll cancel out.)

In most situations, these indirect impacts on your car’s fuel economy will be virtually negligible, provided you’re driving. If the car’s idling with the fans at high speeds, it may deplete the battery. However, you should find the battery restored to its normal levels after a half-hour drive.

If You Use A Car Heater, Does It Waste Gas?

Not really. The impact of using a car heater on your mpg will be essentially nothing.

A car heater is there to be used, whether for comfort or for essential functions like clearing the windshield of frost and ice.

Of course, you might use marginally less if you turn it off, but there’s no genuine reason. If you’re worried about the electrical load, maybe turn the fan speed down slightly – but you don’t need to do anything extreme.

A car is designed to use fuel. For a vehicle to function as it was intended, it needs to use gasoline. Sometimes, it’s simple to forget this, getting caught up with every small gas-conserving trick.

Your car needs a heater. It uses minimal extra fuel, so – in brief – don’t worry about it too much. Turn the heater on when you need it, and turn it down or off when you don’t. The difference it’ll make to your gas usage will essentially be negligible.