iHeat 3.5 GPM Electric Tankless Water Heater 16 kW Real-Time Modulating. Model S-16 IHeat tankless S-16 is a lead free certified product Indicator lights and power button for easy operation 2-UL Recognized,ANSI Certified,CSA Certified,ETL Listed Very easy to install; Heat Exchanger: 100% Stainless Steel Consult electrician. Requires 1-70 Amp Double Pole Breaker