What size power cord for block heater?

The size of the power cord for a block heater typically depends on the heater's wattage and the distance from the power source. Generally, a 16-gauge extension cord is suitable for block heaters up to 1,000 watts, while heavier-duty 14-gauge or 12-gauge cords may be needed for higher wattage heaters. It's essential to ensure the cord is rated for outdoor use and can handle the amperage required by the block heater. Always check the manufacturer's recommendations for specific requirements.