From: On Demand

The Energy Star–rated N-0841MC tankless water heater yields 93% energy efficiency versus 60% of a typical tank water heater due to its Hybrid Super Heat Exchanger—a stainless and copper heat exchanger fused into one. The unit, which uses gas or propane, delivers up to 11.1 gallons per minute at a 35-degree temperature rise and 8.4 gallons per minute at a 45-degree temperature rise. Energy factor: 0.94. 877.986.6748. www.noritz.com