Brazetek 210 kBTU 316L Stainless Steel Spa/Solar/Swimming Pool Heat Exchanger Applications: Swimming Pools, Spas, Hot Tubs, Solar, Hydronic Heating, Oil Cooling, Heat Recovery, Snow Melting, etc. AISI 316L All-Welded Stainless Steel Construction Operating Temperature Range: 18F-248F Max. Operating Pressure: 190 psi