What is the primary energy source for duct heaters?

Duct heaters primarily use electricity as their energy source because they are designed to convert electrical energy into heat directly. This method allows for efficient heating, particularly in HVAC (heating, ventilation, and air conditioning) systems where duct heaters are often integrated to warm air being distributed throughout a building. Electric duct heaters can be easily installed and controlled, offering a level of convenience and reliability that is often preferred in modern applications.

While oil, gas, and coal can be used as energy sources for heating, they do not pertain specifically to duct heaters as commonly as electricity does. In many instances, other heating systems, such as boilers or furnaces, utilize these fuels more frequently. Duct heaters focus on the direct electrical input that makes them suitable for immediate and localized heating needs without the additional infrastructure and maintenance associated with fossil fuels.