The Sapphire Series 14L is a 100,000 BTU indoor tankless water heater capable of producing up to 5.3 gallons per minute (GPM). With low water flow ignition, the SAP12L will ignite at just 0.5 gallons per minute. It's designed to save you space and lower your overall energy costs up to 40% versus a traditional tank type water heater. Using an electronic ignition that only ignites when you open a hot water tap, no longer will you waste money on a standing pilot light. Digital controls allow you to adjust the temperature with a simple push of a button.