The Navien 240A represents the original generation of the advanced recirculation tankless series, whereas the 240A2 is the updated, second-generation model featuring refined engineering and upgraded software. The NPE-240A2 introduces the EZNav multi-line digital control panel with an intuitive setup wizard, enhanced dual Venturi gas conversion capabilities, improved internal component layouts for easier serviceability, and advanced Vent Installation Detector safety technology while retaining the core built-in recirculation pump and buffer tank.
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