Swimming Pool Heat Exchangers have an innovative spiral-twisted corrugated tube design that is engineered to maximize solar or boiler energy, increasing the overall thermal efficiency of the system. The tube's design also ensures high velocities inside the unit, making our Swimming Pool heat exchanger a very reliable, efficient and cost effective way to transfer heat indirectly between any hot water circuit, steam circuit and any pool or spa application. This product is made of stainless steel 316L and has 2" and 1 1/2" FPT. The capacity of this particular model is 360,000 Btu. This product has a 1.5 year warrantyagainst manufacturer's defects and is UL listed. We also have this model with opposite side ports available.