# Navien NPE-240A2 vs A.O. Smith ProLine XE ATI-540H-N: specs and price compared

A sourced, side-by-side comparison of the Navien NPE-240A2 (Navien) and A.O. Smith ProLine XE ATI-540H-N (A.O. Smith) among tankless water heaters.

## Side by side

| Spec | Navien NPE-240A2 | A.O. Smith ProLine XE ATI-540H-N |
| --- | --- | --- |
| US price | $2099 | not published |
| Brand | Navien | A.O. Smith |
| Fuel type | natural-gas | natural-gas |
| Max flow rate gpm | 11.2 | 10 |
| Max btu per hour | 199900 | 199000 |
| Power input (kW) | — | — |
| Uniform energy factor | 0.95 | 0.93 |
| Condensing type | condensing | condensing |
| Min activation flow gpm | 0.5 | — |
| Vent type | pvc | pvc |
| Max temp f | — | — |
| Heat exchanger warranty yrs | 15 | 15 |
| Wi-Fi enabled | No | — |
| Weight (lb) | 77 | — |

## Key differences

- Max flow rate gpm: Navien NPE-240A2 11.2 vs A.O. Smith ProLine XE ATI-540H-N 10
- Max btu per hour: Navien NPE-240A2 199900 vs A.O. Smith ProLine XE ATI-540H-N 199000
- Uniform energy factor: Navien NPE-240A2 0.95 vs A.O. Smith ProLine XE ATI-540H-N 0.93

## Sources

- Navien NPE-240A2: https://www.navieninc.com/products/npe-240a2 (navieninc.com, verified 2026-07-11)
- A.O. Smith ProLine XE ATI-540H-N: https://www.hotwater.com/products/tankless-high-efficiency-condensing-proline-xe/ati-540h-100/100123378.html (hotwater.com, verified 2026-07-11)

Canonical: https://frontdeskreview.com/gear/tankless-water-heaters/navien-npe-240a2-vs-ao-smith-proline-xe-ati-540h-n/
Cite: Per The Front Desk Review, Navien NPE-240A2 ($2099) vs A.O. Smith ProLine XE ATI-540H-N (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/tankless-water-heaters/navien-npe-240a2-vs-ao-smith-proline-xe-ati-540h-n/
License: CC BY 4.0.