A.O. Smith continues to lead the way in residential and commercial water heating with close to 70 years of innovative hot water solutions. The ATIO-910-N features A.O. Smith's latest commercial water heating technology, including a commercial-grade HRS35 copper heat exchanger. The ATIO models can be installed either indoors or outdoors with the use of the optional outdoor vent cap. The ATIO-910-N is perfect for water storage tanks, recirculation systems, hydronic heating systems, radiant floor heating systems, and other heating applications. An 80% thermal efficiency rating and certified low NOx emissions means commercial hot water can be yours without much strain on your wallet. Optional multi-unit controllers, direct vent kits, and remote controls give you flexibility to handle almost any application. Heavy Duty Heat Exchanger The primary heat exchanger is built out of HRS35 copper, stronger than standard copper and designed to be more resilient against corrosion. A.O. Smith water heaters are built to last and save you money in the process. Multiple Safety Features ATIO models come with a long list of safety features standard. These include: built in freeze protection, manual reset hi limit, an overheat cutoff fuse, inlet and outlet thermistors to monitor temperatures, and a built-in flame sensor. Low NOx Emission Standard The ATIO line all qualify for low NOx emissions requirements. This means that not only will these water heaters help save you money, but they are better for the environment as well. Space Saving Design A.O. Smith tankless heaters take up less space than their conventional counterparts. The convenient wall mount design means they can fit in nearly any home layout either indoors or outdoors.