2019 Rinnai Tankless Models • RU Series (Super High-Efficiency Condensing): Models like the RU199iN, RU160iN, and RU80iN offered up to 0.95–0.96 Uniform Energy Factor (UEF) ratings, Wi-Fi compatibility, and installation flexibility for indoor or outdoor venting. • RSC Series (Condensing with Recirculation): Models like the RSC199 featured a built-in pump and thermal bypass valve to deliver faster hot water availability at the tap. • V Series & RL Series (Non-Condensing / High-Efficiency Plus): Standard options like the RL94 and V94 series provided reliable on-demand hot water for smaller to mid-sized residential setups.