Modular boilers work in tandem with each other. By connecting multiple modules in tandem, the system can fire up or shut down modules in direct response to the demand. When steam is not needed, the modules shut down; when demand increases, modules can fire up within five minutes.

Through convection the warm interior air transfers heat energy into the metal that forms the coil, and the metal in the coil transfers its heat energy to the fluid. This fluid is then run through a compressor and passed into the coils on the outside of the building where it releases the heat to the outside air.