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To provide a quick and easy tank replacement solution to both contractors and end users, Rinnai America Corp. created the non-condensing Demand Duo R-Series Commercial Hybrid Water Heating System. Its design connects easily to the existing 6-inch B-Vent, allowing contractors to quickly and easily replace standard-efficiency atmospheric tanks. Sold in 80- or 119- gallon tank options, the Demand Duo R-Series eliminates the need for new vent penetrations. The pre-installed drip leg and 36-inch Swivel-Flex Gas Line also creates material efficiencies and reduces install time with a pre-installed electrical junction box and duplex outlet. The digital controller also allows management of building recirculation without having to purchase an additional aquastat.