The Atmor thermostat electric tankless water heaters revolutionize hot water heaters with self modulating technology that provides you with unlimited hot water when you need it, without the wait. By automatically activating Once water flow is sensed and shutting off when it stops, you'll lower your water consumption and eliminate costly water waste. This eco-safe unit features the advanced thermostat technology that regulates the amount of energy required to heat the water, delivering major savings on your energy bill. The easy-to-use, digital panel gives you full control over the unit for the perfect water temperature every time. The digital technology also allows you to use this unit as a booster in line with pre-heated water to help fill a void when hot water is needed. Best of all, unlike a gas water heater, the compact, space-saving design requires no venting, giving you the flexibility to install anywhere inside your home or garage. This unit is specifically designed for a full bathroom. Recommended flow rate of 2.3 gallons per minute (gpm) is recommended for optimal performance (a water Saver shower head required for optimal performance). colder climates that require a higher temperature rise will reduce the amount of applications and gpm (gallons per minute). perfect for residential and commercial use. Unit requires a 60 amp dedicated single-phase, double pole breaker. Required wire size: 4 AWG. Standard 1/2 inch NPT (straight thread) fittings. Flow rate of 2.3 gpm = 45° temperature rise. Remember inlet temps vary by location and seasonality. Selecting the right water heater depends on your incoming water temperature, flow rate, and desired output temperature. To help with making sure this unit is suitable for your need, please see our selection guide below or call our support team at 888.783.6082.