Navien NPE-240A2 Tankless Water Heater vs Rinnai RX180iN Tankless Water Heater

Both are indoor condensing tankless units with stainless heat exchangers and recirculation, so the choice comes down to capacity and control. The Navien NPE-240A2 delivers more hot water at once with its 199,900 BTU input, built-in buffer tank and recirculation pump, and field-convertible gas setup. The Rinnai RX180iN is the more efficient unit at 0.98 UEF and pairs with Rinnai's Smart Sense app and Wi-Fi control. Pick Navien for larger homes and heavy simultaneous demand; pick Rinnai for tighter efficiency and app-based control.

• Choose the Navien NPE-240A2 if you have a large home with multiple bathrooms running at once and want a built-in buffer tank and recirculation pump without extra parts.
• Choose the Rinnai RX180iN if you want the higher 0.98 UEF efficiency and app-based Smart Sense control for a mid-size home.