【STAINLESS STEEL MATERIAL】- Made of high-grade anti-corrosion stainless steel, the pool heat exchanger is rust- and saltwater resistant, and thus highly durable and perfect for chlorine or saltwater pools and spas. 2″ FPT opposing side for pool water and 1″ FPT for hot water. 【CONSTANT TEMPERATURE】- The salt swimming pool heat exchanger features an innovative spiral-twisted to ensure continuous constant temperature and can transfer heat indirectly between any hot water circuit, steam circuit and any pool or spa application. 【HIGH EFFICIENT HEAT EXCHANGER】- The shell and tube heat exchanger is capable of 400 kBtu/hr fresh pool based on 60°C (140°F) temperature difference between incoming heating and heated water. Hot immediately and no need to wait. 【SUPERIOR SAFETY】- This heat exchanger is a very safe, reliable, efficient and cost-effective way to heat a swimming pool or spa from any hydronic system. 【VARIOUS APPLICATIONS】- The heat recovery pool heater is perfect for swimming pools, spas, hot tubs, solar, hydronic heating, oil cooling, heat recovery, snow melting, etc.