Navien NPE-24SWE Standard Natural Gas Water Heater - Advanced Efficiency for Home and Business The Navien NPE-24SWE Standard Natural Gas Water Heater is a tankless water heating system that is high-performance and reliable. With over 10 years as the No.1 selling tankless water heater in North America, this advanced system is trusted by homeowners and businesses worldwide. Its innovative design and features make it the ultimate on-demand hot water solution. Key Features and Benefits Energy Efficient Design: Dual stainless steel heat exchangers for maximum performance and durability while reducing energy consumption. Powerful Performance: Up to 24 litres per minute at 25°C temperature ri