Product Description The NORITZ NRC66OD is a fully condensing outdoor tankless water heater with an advanced heat exchanger design and built-in controller. With flow rates up to 6.5 gallons per minute the NRC66 delivers the highest flow rates in its category. IK-WV-200-1-XX-LF valve kit (required for installation) is sold separately. Common companion item is pipe cover-shroud PC-1S. From the Manufacturer Outdoor condensing tankless water heater up to 6.5 gallons per minute. Noritz has been an innovator in the water heating industry for over 60 years. We introduced the first modern, electronically controlled tankless water heater in 1981 and we remain the leader in energy savings and superior hot water delivery today. Our goal is to empower you with the highest quality products available at superior value.