- Continuous flow rate up to 6.6 GPM
- Wall-mount design saves valuable space and allows for additional storage and flexibility
- Primary commercial-grade copper heat exchanger is 25x better than stainless steel at heat transfer, stabilizing outgoing water temperatures quicker
- Secondary heat exchanger is made of 316L Stainless Steel to protect against corrosion
- Highly efficient condensing Ultra-Low Nox tankless water heater delivers up to .91 Uniform Energy Factor (UEF)
- Vents with 3” PVC up to 70 feet or 4" PVC up to 100 feet
- Includes integrated temperature controls and advanced diagnostics to simplify troubleshooting
- Safety features include exhaust & water temperature safety control, overheat cut-off fuse and air-fuel ratio (AFR) sensor
- 15-year limited warranty on heat exchanger in residential applications
The 140H Series offers high efficiency Ultra-Low NOx condensing technology allowing for the use of 3” PVC venting and has 0” clearance to combustibles. Indoor models are certified up to 10,100 ft. altitude. Provides a variety of installation options: indoor, outdoor and direct vent. Complies with Ultra-Low NOx regulations and meets the energy efficiency requirements of ASHRAE 90.1b-1992. The ATO-140H-N tankless water heater uses up to 120,000 BTUs of natural gas to deliver a max flow rate of 6.6 GPM. It utilizes condensing technology to achieve a Uniform Energy Factor of 0.91. this model meets Ultra-Low NOx emission requirements, and comes with a 15-year limited warranty. A. O. Smith’s ProLine® water heaters are residential products built to commercial-grade standards and are only available for purchase through professional wholesalers and contractors.
