Unlike traditional water heaters, the MrCool provides neverending hot water to up to four bathrooms and multiple home appliances simultaneously With a high volume and flow rate, this tankless heater is highly efficient while still being environmentally friendly This compact and spacesaving heater has a much longer lifespan thanks to the stainless steel, corrosion resistant engineering This design has four times the corrosion resistance of copper and is lead free One of the many high tech features of this unit is the electronic thermostatic PCB, which provides intelligent temperature control and gas flow that is automatically controlled The EDM BLDC variablespeed fan provides stable combustion along with a smooth air flow transition The combustion chamber is surrounded by water tubes making it a thermal insulator also The environmentallyfriendly premixed burner gives a reduction of NOx emissions, lowers the flame temperature, and reduces portloading You can experience the most comfortable shower experience thanks to the selfadapting temperature regulation A large touchscreen display provides helpful information to you and your plumber about the heaters operation This unit must be installed by a professional This MrCool will replace your old water heater and provide efficiency and effectiveness