The Titan SCR2 N-120 continually heats water instantaneously as you require it - and only when you require it. The Titan unit completely replaces a conventional tank heater with no disruption to your comfort and hot water needs. This unit is highly recommended in areas with warm climates where the incoming water temperature is above 65° degrees Fahrenheit Recommended Use 1-3 standard bathroom homes For use in warmer weather areas where the ground water is above 65° F This is a very popular and versatile model