In commercial complexes, natural gas is mostly used as fuel for engine room boilers because it is usually easily accessible, clean, and more economical than diesel and electricity. Some engine boilers are designed to use more than one type of fuel (usually natural gas and diesel). Dual-burner boilers provide extra gas for fuel outages. It also allows the consumer to use petroleum fuel (diesel) when the amount of natural gas reaches a peak. When the amount of natural gas is higher than other fuels, it is possible to save on fuel costs by using cheaper fuel and limiting the use of natural gas.

Engine room boilers, both in the low pressure and high-pressure categories, must operate in accordance with the instructions of the pressure pipes and boilers of the Mechanical Engineering Association. In low-pressure boilers, the maximum pressure during operation should be psi (pounds per square inch) for steam and psi for hot water. Most installations use low-pressure boilers. High-pressure boilers are designed to operate under pressure limits beyond low-pressure boilers and are commonly used for power plants. The water temperature for hot water boilers is ° C.

Electric boilers are used in buildings that require very little steam or no access to natural gas. Electric boilers are referred to as clean, quiet, compact, and easy to install boilers. The lack of a combustion process reduces the complexity of design, execution, and maintenance. Heating agents can be easily replaced in case of failure. This type of engine room boiler can be used to generate steam or low pressure or high-pressure water or it can be a good option for those consumers who are limited by gas emission laws. Their size varies from , to , BTU input. In general, its efficiency is % to %.

The pressure difference between the combustion chamber of the boiler and the ventilator (also called the exhaust chimney) creates a suction that carries the products of combustion along with the boiler and directs it to the chimney. The natural suction of boilers depends on the natural buoyancy of hot gases to remove combustion products through the aerator and direct fresh air into the combustion chamber. Mechanical suction of engine room boilers includes compressed air, where the air is forced into the combustion chamber by a fan or blower to maintain positive pressure. Induction suction, where the air is drawn through the combustion chamber by a fan or blower to maintain negative pressure.

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