The features of package boilers are:
Small combustion space and high heat release rate resulting in faster evaporation.
Large number of small diameter tubes leading to good convective heat transfer.
Forced or induced draft systems resulting in good combustion efficiency.
Number of passes resulting in better overall heat transfer.
Higher thermal efficiency levels compared with other boilers.
These boilers are classified based on the number of passes - the number of times the hot combustion gases pass through the boiler. The combustion chamber is taken, as the first pass after which there may be one, two or three sets of fire-tubes. The most common boiler of this class is a three-pass unit with two sets of fire-tubes and with the exhaust gases exiting through the rear of the boiler.
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