The NORITZ NC380 is the largest tankless water heater available on the market today. �Designed for the rigors of commercial operation, the NC380 comes standard with a K-Copper heat exchanger (25% thicker than competing models), commercial grade gas valves and an array of ASME certifications. �This fully modulating tankless water heater can deliver a wide range of water temperatures from 100-180f. �Utilizing a quick connect cable, or system controller, one can link from two to twenty four units into a single zone for increased capacity (up to 312 GPM) and redundancy. �The NC380 can be installed indoors (using 5" Category III Venting) or outdoors by utilizing the VC-132 outdoor vent cap. �IK-WV-300-1-XX-LF Valve Kit (required for installation) is sold separately.