# A.O. Smith ProLine XE ATI-540H-N: specs and price

**Price (US):** Not published (No published US MSRP could be verified verbatim. The A.O. Smith manufacturer page states ProLine is "only available for purchase through professional wholesalers and contractors" and shows no price. The Amazon corroboration page shows "No featured offers available" (no price). Third-party wholesaler listings that showed a price in search (e.g., AF Supply ~$1,726.40) returned HTTP 403 and could not be fetched to confirm the figure verbatim, so priceUsd is left null.), as of 2026-07-11.
**Brand:** A.O. Smith
**Deskmark:** Platinum Deskmark — pay-blind category standing 95/100, #1 of 8 in class (independent, computed from sourced data, never for sale).

## Specifications

| Spec | Value |
| --- | --- |
| Price (US) | Not published |
| Brand | A.O. Smith |
| Fuel type | natural-gas |
| Max flow rate gpm | 10 |
| Max btu per hour | 199000 |
| Power input (kW) | — |
| Uniform energy factor | 0.93 |
| Condensing type | condensing |
| Min activation flow gpm | — |
| Vent type | pvc |
| Max temp f | — |
| Heat exchanger warranty yrs | 15 |
| Wi-Fi enabled | — |
| Weight (lb) | — |

## Where it stands

On the spec sheet, its heat exchanger warranty yrs of 15 is the highest of the 7, its max flow rate gpm of 10 is above the median of the 8, and its uniform energy factor of 0.93 is below the median of the 6.

## Frequently asked questions

**How much does the A.O. Smith ProLine XE ATI-540H-N cost?**

The A.O. Smith ProLine XE ATI-540H-N has no published US price as of 2026-07-11.

**What are the A.O. Smith ProLine XE ATI-540H-N's key specs?**

A.O. Smith ProLine XE ATI-540H-N (A.O. Smith): fuelType natural-gas, maxFlowRateGpm 10, maxBtuPerHour 199000, uniformEnergyFactor 0.93, condensingType condensing. Full sourced spec sheet verified 2026-07-11.

Source: https://www.hotwater.com/products/tankless-high-efficiency-condensing-proline-xe/ati-540h-100/100123378.html (hotwater.com, accessed 2026-07-11)
Corroboration: https://www.amazon.com/AO-Smith-ATI-540H-N-Condensing-Residential/dp/B008DC0TTO (accessed 2026-07-11)
Canonical: https://frontdeskreview.com/product/tankless-water-heaters/ao-smith-proline-xe-ati-540h-n/
License: CC BY 4.0. Price history: https://frontdeskreview.com/data/price-history.jsonl