A.O. Smith · Updated July 2026
A.O. Smith ProLine XE ATI-540H-N: full specs
A.O. Smith ProLine XE ATI-540H-N. Every price and spec below is linked to its source and dated — no guesses.
Source: hotwater.com verified STALE · 2026-07-11 ✓ corroborated verify in ledger
The A.O. Smith ProLine XE ATI-540H-N has no US price of record yet. It earns a Platinum Deskmark — 95/100 pay-blind standing, #1 of 8 in class.
Verified Jul 11, 2026 · figures linked to their source in the table below
Is the A.O. Smith ProLine XE ATI-540H-N a good buy?
On the spec sheet, its heat exchanger warranty yrs of 15 is the highest of the 7, its max flow rate of 10 gpm is above the median of the 8, and its uniform energy factor of 0.93 is below the median of the 6.
Specifications
| 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 corroborating 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) blocked access and could not be opened to confirm the figure verbatim, so no price is listed. |
|---|---|
| Brand | A.O. Smith |
| Released | — |
| 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) | — |
Source: hotwater.com (read 2026-07-11) STALE · 2026-07-11 · corroborated by amazon.com (read 2026-07-11).
How we checked
The A.O. Smith manufacturer page (hotwater.com, Model "ATI-540H 100") confirms this is the exact ATI-540H-N unit: its product description literally reads "The ATI-540H-N tankless water heater uses up to 199,000 BTU/hr of natural gas," and its Tech Specs supplied UEF 0.93, 199,000 maximum BTUs, a 15-year limited heat-exchanger warranty, natural-gas/condensing type, and "Continuous flow rate up to 10.0 GPM." The Amazon listing titled "AO Smith ATI-540H-N" corroborates model identity, gas power source, and the 10 GPM flow rate. No price is published: the manufacturer sells ProLine wholesale/contractor-only with no MSRP and Amazon showed "No featured offers available," while third-party wholesaler price pages returned HTTP 403 and could not be verified verbatim, so the price is left blank. max temp (°F), min activation flow (gpm), wi-Fi enabled, and dry weight (lb) were not explicitly stated on either fetched page (the page lists only 70 lb shipping weight, not dry weight), so they are left blank.
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 US price of record 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): Fuel type natural-gas, Max flow rate (gpm) 10, Max btu per hour 199000, Uniform energy factor 0.93, Condensing type condensing. Full sourced spec sheet verified 2026-07-11.
Similar tankless water heaters
Nearest in price — swipe to browse. Every pick sourced and dated.
All tankless water heaters ranked · Open data & methodology · Queryable via MCP
Compare with
Head-to-head
- A.O. Smith ProLine XE ATI-540H-N vs Rinnai RU199iN
- A.O. Smith ProLine XE ATI-540H-N vs Navien NPE-240A2
- A.O. Smith ProLine XE ATI-540H-N vs Rheem RTGH-95DVLN
- A.O. Smith ProLine XE ATI-540H-N vs Bosch Greentherm T9900i SE 199
- A.O. Smith ProLine XE ATI-540H-N vs Noritz NRC711-DV-NG
- A.O. Smith ProLine XE ATI-540H-N vs EcoSmart ECO 24
- A.O. Smith ProLine XE ATI-540H-N vs Stiebel Eltron Tempra 36 Plus