Product description: ★The heat exchanger is made of high quality stainless steel, which is corrosion resistant and very durable. It is constructed with a bellows for optimum efficiency. ★ This heat exchanger is used to keep the pool and boiler water separated, and is an effective way of transferring heat between the two systems. ★ Smooth tube and shell construction allows water to flow through the heat exchanger at high speeds to maximize heat transfer. ★ This heat exchanger is uniquely designed to complement your pool system or sauna. ★ We offer 2 different types of heat exchangers, which are suitable for swimming pools, saunas, etc.