How Much Fuel Does Idling with Heater On Consume?
2 Answers
Turning on the car's heater for one hour consumes approximately 1-2L of fuel. Below are detailed explanations regarding fuel consumption with the heater on: 1. Fuel consumption for idling with heater on for one hour: According to relevant test results, the fuel consumption when idling with the heater on is not only related to the car's displacement but also to the engine's tuning. From some related test results, it is known that for general family cars, when the engine is idling, turning on the car's heater for one hour consumes about 1-2L of fuel. The specific fuel consumption may vary depending on different car models. 2. Whether idling with heater on harms the car Keeping the car in an idling state while turning on the heater inside does not cause very serious damage. The main impacts on the car when idling in place are increased fuel consumption and engine carbon deposits. Therefore, to avoid potential issues with the car's engine, it is recommended not to keep the car idling for extended periods.
Having driven for over 30 years, I often encounter the issue of idling with the heater on. Fuel consumption does increase significantly because the engine keeps running to generate heat, essentially burning fuel for nothing. Specifically, compact cars like sedans consume about 0.5 to 1 liter per hour, while larger SUVs or pickup trucks may use up to 1.5 or even 2 liters. This also depends on temperature—the colder it is, the slower the engine warms up, leading to higher fuel consumption. Once, at -10°C, I idled with the heater on for half an hour and noticed the fuel gauge dropped by half a mark. I recommend avoiding prolonged idling; instead, driving a short distance helps the engine reach optimal efficiency faster, which actually saves more fuel. Newer cars today have better energy-saving designs, but old habits should change—it’s better for both the environment and your wallet.
