The 540 Series is well suited for residential use. Utilizing commercial-grade copper alloy for the heat exchanger tubing, the 540 Series is also suitable for heavier residential usages such as domestic recirculation systems. Remote control included as a standard feature on all outdoor models. Indoor models are certified up to 10100 ft altitude. Provides a variety of installation options - outdoor and direct vent. Complies with ultra-low NOx regulations and meets the energy efficiency requirements. Easy-link system capable up to four units. The ATI-540H-N tankless water heater uses up to 199000 Btu/hr of natural gas to deliver an endless supply of hot water for a three-bath home in northern climates and up to a four-bath home in southern climates (one shower head per bath). Utilizing condensing technology, this heater is extremely efficient with a uniform energy factor of 0.93. With an industry leading 15 years limited warranty, the ATI-540H-N tankless water heater provides years of hot water through innovation and quality.
AO Smith® Tankless Water Heater, Series: 540H, 15000 to 199000 Btu/hr, 10 gpm Flow Rate, 0.93 Energy Factor, 70 ft L at 3 in Dia, 100 ft L at 4 in Dia Vent, Power Direct Vent, 120 V, NPT Connection, 15 to 150 psi, 4 to 10.5 in-WC, 3 in, 4 in Vent Diameter, Natural Gas Fuel, Ignition System: Electronic, Lead-Free, 99 to 122 deg F, 23-5/8 in H x 17-3/4 in W x 11-1/4 in D, 10100 ft Altitude
| Altitude | : | 10100 ft |
| BTU Rating | : | 15000 to 199000 Btu/hr |
| Connection Type | : | NPT |
| Dimensions | : | 23-5/8 in H x 17-3/4 in W x 11-1/4 in D |
| Energy Factor | : | 0.93 |
| Flow Rate | : | 10 gpm |
| Fuel Type | : | Natural Gas |
| Ignition System | : | Electronic |
| Lead-Free/Contains Lead | : | Lead-Free |
| Pressure Rating | : | 15 to 150 psi, 4 to 10.5 in-WC |
| Series | : | 540H |
| Temperature Rating | : | 99 to 122 deg F |
| Vent Diameter | : | 3 in, 4 in |
| Vent Size | : | 70 ft L at 3 in Dia, 100 ft L at 4 in Dia |
| Vent Type | : | Power Direct |
| Voltage Rating | : | 120 V |
- The primary heat exchanger is constructed of commercial-grade copper, which is stronger than standard copper and more resilient against erosion
- Condensing models feature 316L stainless steel secondary heat exchanger, providing additional protection against corrosion
- Includes freeze, overheat, surge protection and troubleshooting diagnostic codes
- AO Smith® tankless water heaters take up much less space that your conventional tank-style water heater
- With no tank to steal valuable storage space, our wall-mount design allows for additional storage and flexibility
- The comprehensive line of A. O. Smith tankless water heaters are an excellent whole home water heating solution that supply endless hot water
Instruction/Installation Manual