The Infiniti™ K Series of tankless water heaters is the smarter way to go tankless. The Infiniti™ K uses STEADISET™ Technology to keep water temperature consistent with NO internal buffer tank. It features best-in-class venting lengths (vent with 2” or 3” PVC or polypropylene), scale reduction, modulation, and warranty (15 years heat exchanger). The series delivers efficiency up to .96 UEF, which helps maximize the financial benefits of tankless