The Mini 3, 120V (volt) tankless electric water heater ships with a 0.5 GPM (gallons per minute) flow restrictor, compensating aerator to provide warm water around 90 to 100 F (degrees Fahrenheit) for hand washing. The aerator must be installed for the unit to work correctly. Check the Mini Sizing Guide to make sure this model is right for your application. The Mini 3 requires 120 V. electric service, 1 dedicated 30A breaker, and 10 gauge copper wiring. The Nichrome (nickel-chromium) bare-wire heating element in all Mini Series models is controlled by a flow switch to prevent dry-firing and failure, and is additionally equipped with a safety high-limit with manual reset. Included is a 2' electrical ship for ease of power hook-up. Water connections are 3/8" OD compression thread for use with braided stainless steel water connectors. Mini tankless electric water heaters do not need pressure relief valves, drains, or circulating pumps. Mini units must be installed vertically with the water fittings pointing either up or down. Mini tankless electric water heaters are exempt from seismic code. The are ETL listed for compliance with CSA and UL safety standards in the US and Canada. 3-year residential and commercial warranty against defects in workmanship and materials and 7 year warranty against leakage under normal use. Tested and certified by WQA against NSF/ANSI 372 for lead free compliance. 3 kW at 120 V. Dimensions: 5-5/8' H x 7-1/2" W x 3-1/4" D. UL/CSA certified. Stiebel Eltron has a superior technical support staff in West Hatfield, MA that can offer sizing recommendations, troubleshooting, and technical help at 1-800-582-8423. No. MINI 3: Capacity: 0.5 gpm, Type: Tankless, Fuel Type: Electric, Wattage: 3kW, Voltage: 120V, Height: 5-5/8 in, Width: 7-1/2 in, Depth: 3-1/4 in, Insulation: No, For Mobile Home Use: No, Uniform Energy Factor: 0.99, Warranty: 3 yr, Pkg Qty: 1, Package Type: Box