A water-to-water, continuous-flow heat exchanger used mainly for boiler applications. Side ports are 1" FIP; end ports are 1-1/2" FIP.
IMPORTANT: Use the Shell & Tube Heat Exchangers (p/n 148, 151 or 177) when heating "salt chlorinated" pools and hots. This is important in order to control pH. Install Plate Heat Exchangers (MPN units) for standard chlorinated pools and hot tubs.