Tankless Water Heater Condensing Ultra-Low NOx Indoor 199,000 BTU Natural Gas

Model ATI-540P-N

The 540P series integrates a recirculation pump to provide instant hot water in residential applications with dedicated recirculation lines. The pump is easily controlled with a simple user interface and multiple pump settings allow you to customize pump operation to meet your needs while maximizing heater efficiency. The onboard computer modulates combustion to yield an up to 0.95 Uniform Energy Factor (UEF) while meeting the strictest gas emissions standards. As part of the high efficiency tankless family, the 540P series provides endless hot water while being environmentally friendly.

The ATI-540P-N indoor tankless water heater uses up to 199,000 BTU/hr of natural gas to deliver an endless supply of hot water for a 3 bath home in northern climates and a 4 bath home in southern climates. It is built with commercial grade materials like marine-grade 316L stainless steel giving it an industry-leading warranty.

Where to Buy

Ashburn, VA 20149

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Hawk Construction LLC

Annandale, VA

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Calabrese Plumbing & Tile,Inc.

Fairfax, VA

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Gidders & Sons Plumbing, LLC

Fairfax, VA

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Ashburn, VA 20149

Change Location or Advanced Settings

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minutes

single shower length

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showers

back-to-back

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showers

at the same time

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gallons

maximum tub size

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time to fill tub

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estimated energy cost

Many factors affect the actual performance of a water heater. This represents our closest approximation of your likely experience with this water heater in Ashburn, VA, but actual performance may vary depending on factors beyond our ability to control or estimate. To view or adjust our assumptions of the most common factors that impact this product’s performance in Ashburn, VA, please view the advanced settings. *Annual energy costs are estimated from the energy efficiency of each water heater, your household’s estimated water usage & set temperature, the average groundwater temperature for your location, and residential energy prices as reported by the Department of Energy.

Product Features & Options

Integrated Recirculation Pump

The integrated recirculation pump will simplify installation as you will not need to spend time and money sourcing & installing the pump and controls. The front panel controls make it simply to set your recirculation pump operation so you now that you will have hot water at your faucet.

Dual Heat Exchanger

The primary heat exchanger is constructed of commercial-grade copper, which is stronger than standard copper and more resilient against erosion. Condensing models feature 316L stainless steel secondary heat exchanger, providing additional protection against corrosion.

Safety Features

Includes freeze, overheat, surge protection and troubleshooting diagnostic codes.

Endless Hot Water

The comprehensive line of A. O. Smith tankless water heaters are an excellent whole-home water heating solution that supply endless hot water.

How it Works

The comprehensive line of A. O. Smith tankless water heaters provide hot water on-demand.

Demand from house fixtures:
• A hot water tap is opened
• The opened tap allows water to flow through the water heater. An internal water flow sensor detects this flow
• Upon flow detection, the flow sensor sends the activation signal to the computer board
• The computer automatically ignites the burner
• As water flows through the heat exchanger, it absorbs heat from the burner
• By the time the water exits the heater, it has reached the designated set temperature
• When the hot water tap is closed, the water heater automatically turns off

Certifications

year

limited warranty

0.93

Uniform Energy Factor

CSA International Low Lead Content Certification in compliance with U.S. and Canadian safety standards on gas components

AHRI Air-Conditioning, Heating and Refrigeration Institute

CSA International Certification in compliance with U.S. and Canadian for gas appliances and other liquid petroleum, LP, propane products

Product Specifications

Tech Specs
Emissions:	Ultra-Low NOx
Maximum BTUs:	199,000
Minimum BTUs:	15,000
UEF:	0.93
Limited Heat Exchanger Warranty:	15 Years
Limited Parts Warranty:	5 Years
Water Connection Location:	Bottom
Water Connection Size:	3/4"
Heat Exchanger:	Commercial Grade Copper
Secondary Heat Exchanger:	Stainless Steel
Voltage:	120
ENERGY STAR®:	Yes
LEED Rating:	1.5
Digital Display:	Yes
Technology:	Condensing

Dimensions & Venting
Type:	Space Saving
Height:	23 5/8"
Width:	17 3/4"
Depth:	11 1/4"
Product Weight:	62.5lbs/28.3kg
Shipping Weight:	70.9
Vent Type:	Power Direct Vent
Vent Length:	70 feet at 3 diameter 100 feet at 4 diameter
Vent Material:	PVC, CPVC, PP, ABS, SS

Technical Documents

Tankless Condensing Common Vent Installation Manual (2000189913)Tankless Condensing 540P Spec Sheet (AOSRG47107)Tankless Condensing 540P Installation Manual (2000536265)Tankless Accessory/Remote Installation Instruction Sheet (2000536344)

Marketing Resources

Tankless Product Guide (AOSBG80000)Recirculating Tankless Sales Sheet

Incentives

Rebate and incentive programs provide cash-back to consumers for the purchase of appliances that meet certain energy efficiency standards. Often, these standards are tied to the ENERGY STAR® program.

Cash for Appliances is designed to encourage the purchase of energy efficient appliances. Consumers who purchase ENERGY STAR® or CEE qualified appliances can receive cash rebates. Most states are offering rebates in the $50 to $250 range.