The new Noritz America RPK-EXT external pump kit gives users time, water and energy-saving benefits of hot water recirculation on an even broader array of residential taknless water heaters, the company notes. Previously available only as a fully integrated circulator in the NRCP line of condensing tankless water heaters, the new RPK-EXT kit can now serve as a separate add-on component to 26 additional Noritz residential