ComfortFlow technology is an advanced system designed to provide the most comfortable and seamless delivery of hot water on the market. The two key components on all "A" model condensing tankless water heaters are, internal insulated buffer tank and a recirculation pump. Since Navien is the only tankless manufacturer to provide you with these premium features you never have to worry about the "cold water sandwich" phenomenon that affects many other tankless water heaters.
Since you have a .5gal buffer tank in all "A" models you never have to worry about a cold slug in the line like other tankless manufacturers suffer from. With the included recirculation pump all "A" models are perfect for recirculation applications out of the box, there is no need to purchase extra components in most cases when installing in a recirculation application.
Internal water of the water heater is heated up to a certain temperature to supply hot water to the tap faster.
Hot Water Outlet
2 way valve