2020 Rinnai Tankless Models Condensing Models • SENSEI RX Series (RXP and RX): High-efficiency units featuring up to 0.98 Uniform Energy Factor (UEF), Smart Sense adaptive gas valve technology (natural gas or propane without a kit), and a Quick Flush feature. Key variants include the Rinnai Sensei 11.1-GPM 199K-BTU Condensing Tankless Water Heater (RX199) and RX160, RX130 variants. • RUS Models: Mid-tier condensing units offering around 0.90 UEF. • RUCS Models: Compact condensing models rated at roughly 0.85 UEF. Non-Condensing Models • RE and REP Series: Traditional high-efficiency non-condensing options with UEF ratings between 0.81 and 0.82, suited for small- to mid-sized domestic applications.