Rinnai introduced the Demand Duo™, a commercial hybrid water heating system. The system combines highly-efficient heat exchanger technologies from Rinnai’s recently-launched 199-Btu, Energy Star-certified C199 condensing commercial tankless water heaters with a 119-gallon tank designed to handle the demands of businesses.

The Demand Duo provides a direct replacement for traditional standard and high efficiency commercial tanks, and features direct vent, common venting options, and single-unit/common vent room-air ability that can use the building’s existing vertical vent penetration. This eliminates the need to core additional holes in walls and roofs to allow for external ventilation, which can lead to leaks.