The Eccotemp EL22i Natural Gas Tankless Water Heater is the largest indoor model of the Eccotemp tankless line. This model has a sleek, black tempered glass casing with automatic temperature controls and a touch screen with an LED digital display that shows the output temperature reading and GPM flow rate. The EL22i is rated at an impressive 6.8 gallons per minute and has a maximum BTU rate of 140,000. Whether you use natural gas or liquid propane the EL22i is the perfect solution for all the hot-water needs of a standard home or apartment with one or two bathrooms, as well as smaller commercial applications.