The 28HE Series high-efficiency cast iron commercial boilers offer thermal and combustion efficiencies of up to 86 percent for oil and 83 percent for gas. The boilers are available in 15 sizes, with gross output ratings ranging from 931 to 4,622 MBtuh, for use in either water or steam systems. They can be fired with light oil, gas, or gas/light oil. Features include heat transfer rods; extra-thick, 3-inch insulated metal jacket; baffled cleanout covers; and graphite port connectors.

Smith Cast Iron Boilers, 260 North Elm St., Westfield, MA 01085; 413-562-9631;

eProduct #199