Navien's NHW-A series is the first and only non-condensing tankless water heater with a built-in ComfortFlow recirculation pump and internal buffer tank. This Navien exclusive innovation resolves the need for an external pump and controls because all the components and recirculation system controls are built-in. The ComfortFlow system also promotes consistent outlet temperature to minimize the “cold-water sandwich effect”. Other features include:

• Built-in recirculation pump & buffer tank
• NaviTech stainless steel heat exchanger and burner
• Interior unit for indoor installations
• NaviVent 3" x 5" concentric venting
• Available in NG or LP
• Cascading capable
• Low NOx emissions (20ppm)

Navien's NHW-A series is the first and only non-condensing tankless water heater with a built-in ComfortFlow recirculation pump and internal buffer tank. This Navien exclusive innovation resolves the need for an external pump and controls because all the components and recirculation system controls are built-in. The ComfortFlow system also promotes consistent outlet temperature to minimize the “cold-water sandwich effect”. Other features include:

• Built-in recirculation pump & buffer tank
• NaviTech stainless steel heat exchanger and burner
• Interior unit for indoor installations
• NaviVent 3" x 5" concentric venting
• Available in NG or LP
• Cascading capable
• Low NOx emissions (20ppm)