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A. O. Smith Tankless Water Heater Natural Gas - On Demand Hot Water - 10 GPM - Outdoor 199,000 BTU Condensing - ProLine® XE ATO-540H-N
✅ In stock
F
Grade
Analysis Confidence
80%
⚠️ Price may have changed. Last updated 24+ hours ago — confirm on Amazon.
Check Deal at Amazon
Price verified Sep 24, 2026 4:58 PM · Prices & availability subject to change
Is This a Good Price on Amazon?
💤 Not a Deal- 💤Verdict: Not a Deal. Price is at or above historical norms. Best to wait for a sale.
- 💰The current price is slightly above the going rate for this product — worth watching for a drop.
- 📉It has been quite a while since a more competitive price was available, lending today's offer solid comparative value.
- ➡️Pricing has held fairly steady, with no strong push in either direction.
How We Scored This Deal
Price Competitiveness
0/28
Recent Value
0/22
Market Standing
0.93/20
Deal Strength
0/20
Momentum
4/10
📝 Product Overview
🏪 Sold by
A. O. Smith Water Treatment
📦 Fulfillment
Fulfilled by Amazon
🚚 Shipping
Free Shipping
Product Details
✓Reduce energy usage and enjoy endless hot water with the Energy Star, condensing Outdoor Natural Gas 540H tankless water heater. Delivers up to .94 Uniform Energy Factor (UEF) and a Continuous flow rate up to 10.0 GPM.
✓Provides a variety of installation options: outdoor and direct vent. Flexible power direct vent design allows for venting up to 100 feet using either PVC, CPVC, polypropylene or ABS Pipe (solid core). Includes a wall mount temperature remote controller and advanced diagnostics.
✓Safe For Your Home: This tankless water heater comes with exhaust & water temperature safety control, overheat cut-off fuse and air-fuel ratio (AFR) sensor. Professional installation recommended. Contact A. O. Smith support at (800) 527-1953.
✓The ATO-540H-N tankless water heater uses extremely efficient condensing technology to deliver an endless supply of hot water for a 3 bath home in northern climates and up to a 4 bath home in southern climates (one shower head per bath). Maximum of 199,000 BTU/hr of natural gas.
✓Stable Water Temperature: The commercial-grade copper heat exchanger in the AO Smith tankless water heater provides 25x better heat transfer compared to steel. 15-year limited warranty on heat exchanger in residential applications.
⚙️ Specifications
Brand
A. O. Smith
Capacity
10 gallons
Power Source
Natural Gas
Product Dimensions
17.75"W x 23.63"H
Special Feature
ENERGY STAR® certified, Overheat Protection
Special Features
ENERGY STAR® certified, Overheat Protection
Voltage
120 volts
Flow Rate
10 gpm
Maximum Temperature
122 °F
Heat Output
199000 british thermal units
Maximum Pressure
150 psi
