To increase the overall efficiency of the boiler, the heat released from the combustion process must be properly transferred into the fluid used. Any heat that is not transferred to the fluid is lost through the body of the boiler or the flue gas. The temperature of the gas inside the chimney is a good indicator of the heat transfer process and therefore efficiency. There are practical limitations to the low flue temperature. Its temperature will be higher than the fluid used in the boiler. In boilers that do not do distillation, the temperature should be high enough that water vapor does not distill in the exhaust chimney and clean the heat transfer surface in the distillation that causes corrosion. Condensing boilers that use natural gas are made and designed with accessories that are resistant to corrosion. Also, their chimney temperature can be less than . degrees Celsius. Trapping heat distillation increases efficiency by more than %.

The presence of large amounts of accumulation of insoluble solids (TDS) in the boiler water can cause sedimentation and reduce the efficiency of the boiler. Therefore, it is necessary to keep the number of solids below the specified limit. As the total hardness increases, the likelihood of sedimentation and sedimentation increases. Drainage of water, called pot immersion, requires the removal of some of the undissolved solids and keeping the total hardness below the rate at which it precipitates. Low but constant and frequent submergence of high doses but rarely is better because it preserves energy, water, and chemicals. Large boilers with a constant load must be continuously submerged where small amounts of water are constantly drawn from the boiler and fresh compensation water is produced.

Leaks may occur in the hot water distribution system. This leakage increases the water and energy consumption of the system as well as the damage caused by the water leakage. Compensation water must be provided for the hot water and steam distribution system to replace the steam and water lost through the leak. This is an easy solution to ensure there is permanent water in the system. It is best to install a measuring device on the system compensation line. The measuring device should be checked weekly for unexpected system water loss.

Modular boilers are small in size and capacity and are usually used to replace several small boilers instead of one large boiler. These modular boilers pass through standard ports and are portable through stairs and elevators. These devices can be arranged in different order to make the most of small places or embed other equipment in those places. These boilers can efficiently provide the required heating load.

Security control of engine room boilers includes high temperature and pressure, high and low gas/diesel pressure, high and low water level, and control of flame safety measures. These controls take into account the safety and limitations that cause the electrical circuit to crack to prevent engine boilers from catching fire. For example, when the boiler pressure exceeds the set range, the fuel valve closes to avoid the dangers of high pressure. Security issues in the flame control system include keys for water shut-off, high restrictions, air stability keys, executive control, and flame sensor. The flame sensor often includes ultraviolet and infrared rods and sensors that are used to indicate the flame status and deactivate the burner in unsafe and unsafe conditions where no combustion has taken place. The flame safety control is set to start and cycle during the execution steps.