ENERGY STAR certified with a 3.0 UEF rating;High-Efficiency & Lower Costs: 4X more efficient, save up to $600 per year in energy costs compared to a standard electric water heater of similar gallon capacity;Easy Installation: Simply plugs into a standard 120 volt wall outlet. Top water connections make it easy to replace an existing gas water heater;Smart Leak Protection Technology: Smart technology detects, alerts, notifies, and protects your water heater in the event of a leak;Smart Anti-Leak Technology: Automatically closes the valve on incoming cold water inlet when a leak is detected to block the cold water supply and reduce property damage;Whisper-Quiet Operation: Operation at 45 dBA (no accessory vibration isolation kit required);User-Friendly, Easy To Control: Digital control makes it simple to set to preferred water temperature and operating modes. Integrated iCOMM connectivity allows control through a free downloadable app; Smart Energy Savings: Allows for participation in utility demand response programs with the equipped CTA-2045-A (AC) utility communication port (participation optional);Eco-Friendly: Utilizes R-513A refrigerant with a 56% lower global warming potential than the standard R-134a refrigerant used in other heat pump water heaters;Backup Water Heating System: Two water heating elements provide hot water if the heat pump is unable to operate