Navien NPE-24AWE Low-NOx Advanced Natural Gas Water Heater The Navien NPE-24AWE Advanced Natural Gas Water Heater is a high-efficiency tankless water heating solution, the best-selling tankless water heater in North America for over 10 years. Homeowners and businesses worldwide trust this advanced system for on-demand hot water. Dual stainless steel heat exchangers give maximum performance and durability with minimum energy consumption. ComfortFlow® Technology, an integrated buffer tank and recirculation pump, eliminates the cold water sandwich effect, delivering hot water on demand while saving water and energy. The unit delivers up to 24 litres per minute at a 25°C temperature rise, suited to demanding residential and commercial applications. It ships configured for Natural Gas as standard; conversion to Propane (LPG) is possible using th