A. O. Smith Outdoor Condensing High Efficiency 120k Btu Ng Tankless Water Heater

ATO-110U 200, External Tankless Water Heater

This unit was a free warranty replacement for my last Takagi Tankless unit which was installed in the summer of 2016. This new unit works great, overall its quieter than the last unit and it seems to heat up the water a bit faster than the previous two tankless water heaters. However I can hear a certain faint mechanic sound when it initially turns on from inside the house but nothing major but something I couldn't hear with the other two Takagi tankless units I previously had. Regardless this unit works great and I laugh at all the neighbors who brag about spending 3 to 4 times more on their Rinaai tankless water heaters!