Navien expands the condensing tankless NPE water heater series with the addition of the NPE-150S. The heating capacity is 18,000-120,000 Btu/hr., and produces 5.3 gpm at a 45° temperature rise. Features include: 1/2” gas pipe capability, 2” PVC venting up to 60’, dual stainless-steel heat exchangers, an integrated and easy-to-use control, field gas convertibility, cascade capability without an external control, and an industry-leading warranty, the company notes.