The NORITZ NRC111DV series heater is at the forefront of modern high efficiency water heating. �It's advance heat exchanger is produced from commercial grade K-Copper which is 25% thicker than competitive models. �With flow rates up to 11 gallons per minute the NRC111DV delivers the highest flow rates in it category and can be vented using 3" or 4" Schedule 40/80 PVC, PP or CPVC. �Various adapters and terminations are available to allow for a wide array of venting options. �This unit is also Quick Connect compatible meaning you can link two identical units together for additional capacity and redundancy (QC-2 sold separately). This unit ships complete with controller and 6' power cord. �IK-WV-200-1-XX-LF valve kit (required for installation) sold separately. Common companion items include rain cap (PRC-1), atmospheric conversion kit (SVCK-3) and horizontal termination/intake PVT-HL.