What is a common type of fuel used in industrial boilers?

Natural gas or oil is commonly used as fuel in industrial boilers due to their efficiency, availability, and ease of use. These fuels can produce a high amount of energy with lower emissions compared to other options. Natural gas, in particular, is favored for its cleanliness and relatively lower environmental impact, making it an industry standard in many regions.

In contrast, while coal has been a traditional fuel source, its use has been declining due to environmental regulations and the push for cleaner energy sources. Propane is typically used in specific applications or smaller setups rather than large-scale industrial operations. Electricity can also be used to power certain types of boilers but is less common for larger boiler systems because of high operational costs and limited capacity compared to fossil fuels. Therefore, natural gas and oil stand out as the most prevalent fuels in this context.