If a building has multiple boilers, you may be able to use the boilers in sequence to prevent repeated cycles. If you use boilers that do not adjust, it is better to use the next boiler when the capacity of one boiler is full, instead of disconnecting and connecting several boilers that are loaded. On the other hand, in regulating boilers, the efficiency of the boiler increases in the load-sharing situation. Therefore, using several boilers at the same time in load sharing mode is more beneficial than using one boiler with % efficiency. Figure shows the relationship between ignition rate and efficiency in boilers with adjustable air and fuel flow utilization.

Engine room boiler controls contribute to the regular, efficient, and safe production of hot water or steam. Combustion and activity control adjusts the fuel consumption according to the required amount. The main executive control shows the hot water temperature or steam pressure and sends a signal to control the amount of combustion in which the amount of air and fuel enters the burner. The order of burning in the burner is generally on / off, high/low / off and gradual.

Natural gas boilers use one of two types of burners, atmospheric burner (natural suction) and compressed air burner (forced air) or electric burner. Nox burners (the type of nitrogen oxides most associated with air pollution) and pre-mix burners (burners where air and gas are mixed before the fan) are commonly used to reduce air loss and stabilize air quality. And even required in some areas. To ensure the usefulness of mixing the air and fuel entering the burner, these types of burners can reduce NOx leakage.

Cast iron boilers are very useful because they can be collected in the basement and passed through smaller doors and gates. The most important drawback is that they are prone to leakage due to the connection of the parts by the washer when the washer becomes old or damaged by chemical reactions. Among the famous cast iron boilers in Iran, we can mention the boiler cast iron boiler and M.I. cast iron boiler made by Iran Pipe and Machine Building Company.

In facilities, in addition to limiting, the system activity sequence is also important to achieve energy efficiency. Nowadays, with the general use of VAV (variable volume) systems in commercial complexes, simultaneous heating and cooling and overheating of the primary air are often ignored. Applying boiler restrictions based on outside air temperature, for example when the temperature is above . degrees Celsius, is an effective way to prevent this situation.