Patterson-Kelley has expanded its MACH Series modulating, condensing hot water boiler line. The MACH, available in 300,000, 450,000, 750,000, 900,000, and 1,050,000 Btuh, achieves 92 percent efficiency, and under certain operating conditions efficiency can be as high as 99 percent, says the company. The boiler can handle variable operating temperatures, frequent cold starts, fast changeovers from cooling to heating, variable system flows, radiant panel and snow melting systems, the company says.

Patterson-Kelley, 100 Burson Street, East Stroudsburg, PA 18301; 570-421-7500;