Certain fossil fuels allows hassle free, industrial boiler operations however with its own pros and cons:

Pros:

1. Easy setup and installations
2. Low maintenance and vigilance
3. Lower government regulations depending on region
4. Continuous operations and lower shutdown time

Cons:

Uneconomical

Uncertain Global markets

Risky and flammable

Polluting

Rising prices Y-O-Y

Difficult to withstand the fumes at boiler site for employees.