Tankless Water Heater Specifi: 3000W maximum current 27A at 110V, required circuit breaker 31AMP, wire gauge 10AWG, water connection G1/2 Features: IPX4 Waterproof, anti-dry burning, anti-leakage, anti-overheating, water heater 110v can raise the water temperature by 45 F (0.3GPM)/27 F (0.5GPM) in a few seconds Temperature Control: Large water flow and low temperature, small water flow and high temperature; tankless water heater cannot be started without turning on the water flow Applicable Occasions: Portable heater electric are suitable for limited spaces such as kitchens, washbasins, RVs, etc. Not suitable for showers (showers usually require at least 1.8 gpm) Temperature Unit Conversion: Long press electric water heater switch for 6 seconds, switch between Celsius and Fahrenheit; if the regulating valve is fixed, the water flow is fixed and the temperature is also fixed Installation Notes: 1. Install vertically water heater to avoid heating element failure (E2); 2. Tighten the pipe joints with Teflon tape to prevent short circuit (E2) High-quality Materials: 304 stainless steel lining, 316L stainless steel heating tube, sturdy ABS shell, corrosion-resistant brass interface.