Used Doyle & Roth VT861-3VE Vertical 20 square foot heat exchanger. Hastelloy C276 tubes rated 150 PSI/full vacuum @ 347 Deg. F. 316L stainless steel shell rated 150 PSI/full vacuum @ 347 Deg. F. Lug Mounted. Built 2000. S/N J9290-3 NB 19046. Estimated Weight 323#.