The NC380 ASME Series of tankless water heaters is for commercial and multi-family applications where hot-water demand varies. The systems can deliver more than 9.1 million Btu per hour when a maximum of 24 units are combined into a single package. The product has a turndown ratio of 17 to 1, helping with small loads. The capacity range extends from 0.7 gallons per minute (gpm) to 13.2 gpm, which calculates into 534 gallons per hour at temperature rise of 70 F. Heaters have a thermal efficiency of 80 percent using natural gas; 84 percent with LP. Noritz. www.noritz.com