Which of the following is a common power supply voltage for electric heaters in HVAC systems?

In HVAC systems, 240 volts is a very common power supply voltage for electric heaters. This voltage level strikes a balance between being high enough to effectively power larger heating elements without requiring excessively heavy wiring, which is needed for higher voltage systems.

Electric heaters are often designed to operate at this voltage because it allows for efficient heating capabilities while still being suitable for residential and small commercial environments. This voltage can provide substantial heating output while ensuring that the installation remains manageable and within electrical code requirements.

While other voltages like 120 V are used in smaller appliances and portable heaters, they typically do not provide the same level of efficiency for larger systems. Higher voltages such as 480 V and 600 V are more commonly found in industrial settings where they are used to power large machinery or systems, rather than in standard electric heating applications for heating spaces. Therefore, 240 volts emerges as the most practical and widely used voltage for electric heating in HVAC systems.