What is the difference between commercial gas modular boilers and ordinary boilers?

Gas modular boiler, is a number of small boilers in parallel heating use, ordinary boilers is a whole large boiler heating use, modular boiler using a number of parallel, can be in the heating sub-stage start, how much heat is needed, start a few boilers, can play a role in saving natural gas, and it is not possible to a few sets of failure at the same time, so it will not happen because of a boiler failure and shutdown of the furnace situation, Vanderlei gas modular Vandeli gas modular boiler, environmental protection, energy saving