Carlson Heat Exchanger manufactures a fully welded parallel plate heat exchanger offering high efficiency and excellent corrosion resistance. Whether your installation is solar, radiant, geothermal, swimming pool, hot tub, spa, or electroless nickel application, a Carlson Heat Exchanger offers a very durable and effective solution. Made of 316L Stainless Steel or Grade 2 Titanium, our welded plate heat exchangers are very compact, up to one third the size of a comparable shell and tube.