The EcoSmart 18kW Electric Tankless Water Heater is ideal for a large apartment/townhome with up to 3 people. The ECO 18 is the mid-range model that can heat over 2.5 gallons per minute. So it can handle a shower and a sink in cool climates. In warmer climates, it can handle two showers and two sinks. Use the EcoSmart interactive sizing guide to find out which model is ideal for you. The most advanced, self-modulating technology available, meaning the ECO 18 will adjust how much energy needs to be input based on how much hot water is needed. Savings of up to 50% on water heating costs. Digital temperature control in 1-degree increments allows control of hot water. Copper and stainless components designed for efficiency, durability and easy replacement. Compact size saves valuable storage space.