A commercial boiler is designed to supply heating and hot water to larger buildings or multiple units, meaning the size and capacity of the unit will be bigger. It will also be more heavy-duty, allowing it to run for extended periods of time, or even 24 hours a day.
With this in mind, the design and complexity of the mechanics and systems differ as commercial boilers will have advanced features such as control systems and multiple circuit options to manage various heating zones or applications.
Finally, commercial boilers are heavily regulated with stringent safety, emission, and energy efficiency standards that need to be met.
Any commercial boiler installed will usually also need to meet standards for ventilation, installation, and operation and may require regular inspections and certifications.