The newly upgraded NCC199CDV commercial condensing tankless water heater from Noritz America offers an industry-best, 10-year warranty on its redesigned dual stainless steel heat exchangers, the company points out. Now produced as a unique, single-piece structure for easier servicing, the new heat exchangers also incorporate substantial improvements in corrosion resistance (100%) and heat-shock durability (200%). The re-engineered NCC199CDV also features an industry-leading Uniform Energy Factor of 0.97.