In the second half of the early 20th century, more stringent production standards for boilers were introduced, particularly with regard to welding and inspection technology, as well as the development of control systems using digital technology, which offer an unmatched level of safety.

The new, highly integrated microprocessor-based "Boiler Control System" (BCS) can perform all the tasks normally performed by experienced operators and allows long-term automation without human intervention. The most important feature of modern package boilers is that they are designed for long periods of unattended operation. You can also get more information about boiler operation from this source:boiler operator training course and high risk work licenses.

The level of human supervision and operator training is determined by modern technology integrated into the Boiler Management System (BCS). They are specified in local boiler regulations and in very different regional standards.

For example, in certain jurisdictions, high-pressure boilers are classified as any type of boiler operating at pressures greater than one BAR (approximately 15 psi). Moreover, apart from other aspects, it should always be supervised by a qualified operator.

Some jurisdictions limit capacity for uncontrolled operation, but in most cases, boiler codes, as well as other applicable laws, have been updated and expanded to meet industry requirements for these types of boilers.

Boiler operations are so advanced that many countries have full-time boiler operations, except for large and complex boilers. However, there are exceptions for chemical regeneration boilers for large power companies and similar processes where the boiler is an essential element.