The EcoSmart ECO 36 Electric Tankless Water Heater is assembled with patented self-modulating technology to regulate exactly how much energy is needed to heat the amount of hot water needed. Not only does this tankless water heater save you money, it is also compact and wall mounted to save valuable storage space. If you have a need for a high amount of hot water, this is the right choice. Ideal for the northern United States, where incoming water temperatures can reach as low as 37°F, the ECO 36 is capable of heating nearly 3.5 GPM at this low temperature and can handle up to two showers running at the same time without running out of hot water. For homes in the southern United States, the ECO 36 is perfect for large tubs or high demands of hot water between multiple applications, handling up to 6 GPM that can run four showers and a sink simultaneously and never run out of hot water.