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A. O. Smith’s line of commercial gas tankless water heaters is available in indoor/outdoor models. They boast 96% thermal efficiency and are compatible with natural gas and liquid propane. The primary heat exchanger is constructed of commercial-grade copper making it more resilient to erosion and 25 times better at heat transfer than stainless steel.

Bosch Thermotechology’s Greentherm 9000 series high-efficiency gas tankless water heater is the first of its kind, delivering endless hot water on demand, the company states. Also includes a user-friendly, high-resolution color interface and is easy to install, Bosch adds. With its ability to cascade up to 24 units, this sophisticated technology is ideal for commercial installations looking to save time, money and space, Bosch notes.

Bradley electric tankless water heaters powered by Keltech deliver dependable on-demand ANSI-ISEA-requires tepid water to emergency safety showers and eye/face washes. Drawing energy only when needed, these tankless water heaters are efficient and precise in supplying tepid water, Bradley notes. CLE and SNA models feature the lowest pressure drops in the industry, Bradley states.

The Laars commercial tankless electric water heater line powered by Keltech ranges from 5-144 kW. Low-flow O.15-gpm and high-capacity 50-gpm models are available and offer many voltage options from 208V single phase up to 600V three phase. Systems offer advanced PID controls and long-life Incoloy 800 elements.

Navien’s NPE-2 condensing tankless water heaters include a turndown ratio up to 15:1, advanced EZNav multi-line control panel with setup wizard, and 2” PVC venting up to 75’. The NPE-2 continues to offer dual stainless-steel heat exchangers, 1/2" gas pipe capability up to 24’ and patented ComfortFlow recirculation system with built-in pump and buffer tank (NPE-A2).

With ultra-high performance and unprecedented space-saving installation flexibility, the S20W offers heating contractors multiple benefits for a variety of new installations as well as for retrofit projects, NTI Boilers states. Featuring an industrial size stainless-steel coil, and with its capability of 445 GPH first-hour recovery rate, the 20-gal. S20W exceeds most industry standard 50- and 65-gal. indirect tanks, the company notes.

Rheem commercial tankless water heating solutions offer thermal efficiency of up to 96% and the ability to easily scale systems up to 3,998,000 Btu/h. Rheem commercial units also include exclusive features such as manifold control readiness, built-in condensate neutralizer, superior polypropylene venting and a proprietary overheat film designed for maximum protection, the company states.

Rinnai's Demand Duo R-Series is a perfect replacement for regular-efficiency atmospheric tanks, the company notes. With the preinstalled gas swivel flex and easy connection to existing 6" B-Vent, installation is a breeze. The R-Series’ unsurpassed first-hour delivery and efficient recovery keeps pace with the demands of any industry, Rinnai says.