RBI has introduced Torus water tube condensing boilers and water heaters designed to bring next level performance in a compact footprint. Offered in sizes ranging from 1250-4000 MBH, Torus boilers are up to 97.5 percent and water heaters are up to 98 percent AHRI Certified efficient. Torus units feature a 5:1 turndown for outstanding performance and quality in a user-friendly design. At the heart of Torus is the heat exchanger. Made from 316L Stainless Steel, Torus heat exchangers are manufactured through a process called tube hydroforming which allows the shaping of high-quality stainless steel tubes that are strong and light. The unique 4-pass design works in concert with a multi-channel manifold and increased tube diameters resulting in ultra-high efficiency with very low pressure drop.