Navien’s Ready-Link Manifold System for NPE Tankless Water Heaters makes manifold mounting onto the rack or directly to a wall simple for new multi-unit installations or emergency same day replacements. The kits are available in configurations of two, three and four units side-by-side, and two and four units back-to-back. Multiple systems can be combined to support up to 16 cascading units in 30 different arrangements. Each component of the system is portable and fits through a standard door opening.