Rinnai Commercial Heating & Applied Products is a division of Rinnai specializing in commercial wall-hung and floor-standing commercial hydronic boilers. Rinnai’s RCB Series offers a complete line of condensing, gas fired boilers that act as a primary or secondary building heat source in any size commercial application. Rely on the RCB Series to deliver reliable, energy saving performance for your building with a ground breaking feature set that outperforms other boilers in its class.