This Smart Technology electric tankless water heaters is configured for climates where incoming water temperature can reach as low as 37 Degree. The ECO 24 is capable of heating nearly 3-Gallon per minute at this temperature. This model is well suited for homes in the Northern U.S. and Canada and in the southern U.S. that have large Roman-style or Jacuzzi tubs and that have generally more demanding water usage needs. Digital temperature control allows you to set your temperature in increments of 1 Degree. Prior to purchase and installation please verify this model is the rights size for your hot water needs and electrical requirements. From the Manufacturer This Smart Technology electric tankless water heaters is configured for climates where incoming water temperature can reach as low as 37 Degree. The ECO 24 is capable of heating nearly 3-Gallon per minute at this temperature. This model is well suited for homes in the Northern U.S. and Canada and in the southern U.S. that have large Roman-style or Jacuzzi