Navien’s NPE-2 condensing tankless water heaters include a turndown ratio up to 15:1, an advanced EZNav multi-line control panel with Setup Wizard, and 2” PVC venting up to 75’. The NPE-2 continues to offer dual stainless steel heat exchangers, half-inch gas pipe capability up to 24’ and a patented ComfortFlow recirculation system with built-in pump and buffer tank (NPE-A2).