The Noritz MR-2 commercial racking system offers the added advantage of installing multiple units in the middle of a space rather than having to affix them to a side wall. Designed for both outdoor (flat rooftops) and indoor (mechanical room) applications, the multirack system holds two tankless water heaters back-to-back and is precisely designed to match the mounting points for all Noritz products. Measuring about 64 inches tall, 19 inches wide and 31 inches deep when fully assembled, the MR-2 has the shape of an inverted “T” and sits flat on the mechanical room floor or rooftop.