The NCC1991 tankless water heater from Noritz America offers a thermal efficiency of more than 94 percent and saves money on both the installation and ongoing operations. Using a special Quick Connect cable, two NCC199-DV units can be coupled to provide an input of nearly 400,000 Btu, with a turndown ratio of more than 36-1. Designed for a wide variety of commercial applications, both new and replacement, it contains a secondary stainless steel heat exchanger that preheats incoming cold water with heat from escaping flue gases. 714-433-2905; www.noritz.com.