Designed to replace an electronic storage tank heater. Provides endless hot water, reduced electricity costs, and space savings. Provides 3.7 gallons per minute for water usage at 105 degrees fahrenheit (2 sinks simultaneously or 1 shower tub). Provides 3.0 gallons per minute for water usage at 115 degrees fahrenheit (2 sinks simultaneously or 1 dishwasher). Based on 55 degrees fahrenheit inlet temperature. Uses electricity. Features flow sensor to provide a constant output temperature.15-1/4 in. W x 15-1/2 in. H x 4-1/2 in. D