Modular boilers were reportedly first introduced in the 1960s. They were quickly seen to reduce system energy losses, improving system efficiency with better load matching, and providing great turndown ratios with better controllability, too. The basic concept of modular boilers is that they are smaller-capacity packaged units that operate in parallel or series to provide varying amounts of heating water. In general, modular boilers are installed in banks of two or more boilers to meet a building’s part-load and peak demands for heating water.
The concept of a modular boiler is continually growing in the building industry for good reasons. Not only can modular boilers be right-sized to help provide the appropriate heating water needed to match the heating loads of a building throughout the day in new construction, but they can do well in retrofits, too. Load-matching with modular boilers is one of the best ways to save energy.