Navien introduces three new chemical-free and environmentally friendly products to refresh its PeakFlow lineup of scale prevention solutions. The three models, PeakFlow S (standard), PeakFlow A (advanced) and PeakFlow C (commercial), expand the options made available by Navien to now include point-of-entry and commercial-grade scale prevention. A and C can be installed at the cold water line leading into a water heater system to prevent scale buildup for flow rates up to 10 gpm (A) or 20 gpm (C).