Car Accessories & Parts

Curated picks

Engine Block Heaters

A cold-weather heater that warms the engine for easier starts

An engine block heater warms the engine coolant or oil in very cold weather so the engine starts more easily and warms up faster. It is plugged into a wall outlet for a while before you drive, often on a timer overnight. It is valuable for anyone in harsh winter climates where freezing temperatures make cold starts hard on the engine.

We round up options on Amazon so you can compare freeze-plug heaters, in-line coolant heaters, magnetic styles, and oil pan heaters. Look for the type that suits your vehicle, the wattage, and a cord with a grounded plug. Because installation and wiring vary, follow the product instructions and consult a professional if needed.

Top picks

Popular engine block heaters

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What to look for

  • Heater type suits your engine
  • Wattage and voltage rating
  • Grounded cord and plug
  • Quality thermostat if included
  • Clear fitting instructions

FAQ

How long should I plug it in?
Many people use a timer for a few hours before driving rather than all night, which wastes energy. The right time depends on the temperature and heater type. Follow the product guidance, as recommendations vary by model and climate.
Is it hard to install?
It depends on the type. Magnetic and oil dipstick styles are simpler, while freeze-plug and in-line coolant heaters can require draining coolant and more work. Wiring varies, so follow the instructions or have a mechanic fit it safely.
Will it help fuel economy?
A warmer engine can start and reach operating temperature faster, which may reduce cold-start wear and warm-up idling. Actual effects vary with conditions. Use it mainly to ease starting and protect the engine in deep cold.