iHeat Tankless AHS18-D 240V 75A 18KW Stainless Steel Enclosure 3/4" MIP 16" by 13.5" by 3.5" Electric Water Heater, 13.7 lb The heat pro-performer AHS18-D is built for applications with more than 1 bathroom in the southern states where the incoming water temperatures no lower than 65 degrees F Because the heat pro-performer continuously monitors all real time data collected 60 times a second through a range of sensors It automatically adjusts to any application you may have, for example floor heating, multiple units in series and recirculation configurations The heat pro-performer boasts a 3/4 in. Inlet and outlet which makes it a breeze for high flow applications Heat electric tank less water heaters are 99% energy efficient which can translate to saving 10-25% on your water heating bills