Raypak 017121 Digital Electric Heater, Raypak E3T, 1-1/2" mpt, 230v, 5.5kWRaypak Electric 3-Series Titanium (E3T) Pool And Spa Heater Model 0005 The Electric 3-Series Titanium heater is the latest technology in pool and spa heating. The E3T is built with titanium heating elements and 316L stainless steel to withstand extreme pool water conditions, including salt water chlorinated pools. The E3T heater operates by utilizing the latest solid-state design and flow sensor technology. It has easy to use digital controls with diagnostics. The compact size makes it is easy to install for new construction or replacement installations. The E3T is equipped with easy to use digital controls and diagnostics. The digital control center shows the desired set point and lets you set the temperature exactly where you want it. The easy to read display allows you to see temperature, GPM flow, and diagnostics. The intuitive alert system keeps you informed. FEATURES: The E3T has a robust 5.5 kilo watt titanium heating element that not only prolongs the life of the heater, but allows it to work in extreme pool water environments, such as salt water chlorinated pools. 316L stainless steel is used in the construction of our heaters. This high grade, corrosion resistant steel is especially suited for salt water heating applications. E3T operates by utilizing the latest flow sensor technology instead of the traditional pressure switch activation. (15 GPM minimum) The E3T uses solid state controls to eliminate noisy and troublesome contactors providing quiet, reliable operation. E3T pool and spa heaters are compact, come standard with union connections, and are easy to install. Box Dimensions: 12-1/8"H x 9"W x 4-3/4"D