2023 Rinnai Tankless Models Key Rinnai Sensei RX Series Models • RXP Models (RXP199iN, RXP160iN): High-efficiency condensing units featuring a built-in recirculation pump and Smart-Circ technology, rated at 0.98 UEF. • RX Models (RX199iN, RX180iN, RX160iN, RX130iN): Premium non-pump condensing units offering up to 0.98 UEF efficiency, dual natural gas/propane adaptability via Smart Sense, and Versa Vent for flexible indoor/outdoor installation. • RUS Models (RUS75e, RUS65e): Streamlined condensing units offering an energy factor around 0.90 UEF.