The major trend in the commercial boiler market, which will continue in 2021 and beyond, is the predominance of packaged boilers installed in multiple boiler cascade systems.
When these boilers are purchased, the heat exchanger, blower, burners and combustion system arrive at the jobsite preassembled and factory tested for proper operation. The contractor installs the near-boiler piping, the vent system, the electrical connections and configures the controls for proper multiple boiler operation.