Richmond® Super High Efficiency Tankless Water Heaters have an UEF rating of 0.93. The Uniform Energy Factor (UEF) is a government regulated measurement of the energy efficiency of water heaters. With this certification these products are not only cost and energy savings, but earth friendly reducing carbon footprint. Add these benefits to the features of the Super High Efficiency tankless products and the decision to go tankless has never been easier. Our products offer continuous hot water, while providing money and energy savings. Richmond® tankless save money and energy by only heating water when you need it, no need to heat a large amount of water in a tank and keep it hot until it's needed. Exclusive! Hot-start Programming™ ensures the unit is in a ready state between back-to-back usage, minimizing any cold-water bursts. Setting the water temperature or monitoring the unit's status is easy with the digital display. Should maintenance be required, the unit's self-diagnostic system will display a maintenance code, which makes trouble-shooting quick, accurate and less expensive.Built-in EcoNet® Wi-Fi Technology allows users to receive alerts and reminders from the smart phone or mobile device. Customize setting to adjust temperature settings or track energy usage. For peace of mind, this product is backed by an industry leading 15-year warranty. 15-year heat exchanger, 5-year parts, and 1-year labor.