Small Gas Boilers

If you’re in the market for a gas boiler, consider getting a residential boiler (figure 1). Even though they’re designed for a different market, they can work well in commercial buildings. Residential boilers are manufactured in larger quantities than commercial units, which makes them relatively inexpensive and readily available with a variety of options. Their small size means you can easily move them in and out of buildings, and the most-efficient residential boilers are as efficient as commercial boilers. You can stage multiple small boilers to provide high efficiency over a range of heating loads.

Figure 1: Diagram of a residential boiler
Boilers come in various configurations using cast-iron, steel, or copper heat exchangers with different types of burners and venting systems. In this example, cast-iron “wet walls” connected by finned copper tubes contain hot water that has been heated by a gas flame. A natural draft chimney vents the heating system to the outside air.
What are the options?
How to make the best choice
What’s on the horizon?
Who are the manufacturers?
Content last reviewed: 
04/05/2019