2024 Rinnai Tankless Rinnai SENSEI RX Series Models • RXP Series (RXP199iN, RXP160iN): Features a 0.98 UEF rating with a built-in recirculation pump and Smart-Circ technology for fast hot water delivery. • RX Series (RX199iN, RX180iN, RX160iN, RX130iN): High-efficiency condensing units boasting a 0.98 UEF rating, outputting between 130,000 and 199,000 BTU (up to 11.1 GPM on top models). • RUS Series (RUS75, RUS65): Mid-tier condensing models delivering a 0.90 UEF rating. • RUCS Series (RUCS75, RUCS65): Compact condensing options rated at 0.85 UEF.