Electric heaters are generally rated at which voltage for kW output?

Electric heaters are typically rated at 240 volts AC for kilowatt (kW) output. This voltage level strikes a balance between efficiency and accessibility, making it a common standard for residential and light commercial electric heating applications. Most electric heating systems, such as baseboard heaters and electric furnaces, are designed to operate effectively at this voltage, allowing for optimal power delivery and performance in heating spaces.

While 120 volts AC is often used for smaller appliances and some heating applications, it generally does not provide sufficient power for larger heating needs. Higher voltage ratings like 480 volts AC and 600 volts AC are more suited for industrial applications where larger amounts of power are needed, but they are not typically found in residential or light commercial heating systems. Thus, 240 volts AC remains the most common and efficient choice for electric heaters designed for general heating purposes.