Product Description ------------------- 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 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. From the Manufacturer --------------------- Noritz is proud to introduce their most efficient tankless heaters, the next generation in tankless technology - condensing heaters. This innovation utilizes a dual heat exchanger, a fusion of stainless steel and copper heat exchangers. The 100% stainless steel component captures the residual heat from the exhaust temperature to preheat the incoming water before it runs through the main copper heat exchanger. This results in dramatic reduction of carbon dioxide and increases the heater's efficiency level to over 93%!