Weil-McLain offers the stainless steel vertical firetube (SVF) commercial boiler line featuring thermal efficiencies up to 97.1%. Available in 750-1100 and 1500-3000 MBH models, the high-efficiency SVF line features a clover-shaped stainless steel fire tube heat exchanger for corrosion resistance and the intuitive and user-friendly Unity control system for simple installation and maintenance, the company explains. www.weil-mclain.com/SVF