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The NaviCirc is a crossover valve that lets a Navien tankless heater recirculate hot water through the existing cold line, so you get faster hot water at the tap without running a dedicated return line. It installs at the fixture farthest from the heater and works with NPE-A, NPE-A2 and NFC-series units. It suits homeowners retrofitting an existing home where opening walls for a return line is impractical. Compared with a full recirculation loop, it delivers most of the convenience with far less plumbing work, though it only serves the fixture it is installed at and depends on the heater's recirculation controls.
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The Navien NaviCirc Recirculation Valve Kit speeds up hot-water delivery in homes that have no dedicated return line. It is installed at the fixture furthest from the water heater. There, it lets a Navien tankless unit form a recirculation loop through the cold-water line.
The kit works with Navien NPE-A2 / NPE-A-Series and NFC-Series units. It is a retrofit solution for existing homes and needs no major plumbing changes. It shortens the wait for hot water and helps reduce water waste during warm-up.