A.O. Smith · Updated July 2026

A.O. Smith ProLine XE ATI-540H-N: full specs

Name: A.O. Smith ProLine XE ATI-540H-N
Brand: A.O. Smith

The A.O. Smith ProLine XE ATI-540H-N has no published US price 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

Check current price at amazon.com We don’t list a US price for this one — check current pricing. As an Amazon Associate we earn from qualifying purchases.

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 2026-07-11 ✓ corroborated verify in ledger

A.O. Smith ProLine XE ATI-540H-N — A.O. Smith — Image: hotwater.com (© A.O. Smith)

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 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.

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 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.
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 (verified 2026-07-11) · corroborated by amazon.com. 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 priceUsd is left null. maxTempF, minActivationFlowGpm, wifiEnabled, and dry weightLbs were not explicitly stated on either fetched page (the page lists only 70 lb shipping weight, not dry weight), so they are null.

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.