Product Description 18 kilowatt, smart technology electric tankless water heater, configured for climates where incoming water temperature is 62 degrees & above, capable of heating over 2.5 gallons per minute which is the equivalent of one shower head with a 1.5 gpm flow & 1 sink with a low inlet water temperature of 62 degrees, 2 Showers can be run simultaneously when incoming water temperature is above 70 degrees warmer climates such as south Texas, south Florida, new Mexico, Arizona & south California, digital temperature control that allows you to set your temperature in increments of 1, 240V, requires two 40a double pole breakers & two 8 gauge wires, included. From the Manufacturer This Smart Technology electric tankless water heater is configured for climates where incoming water temperature is 62 Degree F and above. The ECO 18 is capable of heating over 2.5-Gallon per minute, which is the equivalent of one shower head (with a 1.5 gpm flow) and one sink with a low inlet water temperature of 62 Degree F. Two showers can be run simultaneously when incoming water temperature is above 70 Degree F in warmer climates such as South Texas, South Florida, New Mexico, Arizona and South California. These models come with a digital temperature control that allows you to set your temperature in increments of 1 Degree. Prior to purchase and installation please verify this model is the rights size for your hot water needs and electrical requirements.