A.O. Smith Signature Series Ultra High Efficiency 10.6-GPM Indoor-Outdoor Natural Gas-Propane Tankless Water Heater with Scale Prevention Kit

Name: A.O. Smith Signature Series Ultra High Efficiency 10.6-GPM Indoor-Outdoor Natural Gas-Propane Tankless Water Heater with Scale Prevention Kit
Brand: A.O. Smith
SKU: GR_19678
Price: 2413.73 USD

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Signature Series Super High Efficiency 10.6-GPM 180000-BTU Indoor-Outdoor Natural Gas-Propane Tankless Water Heater with Scale Prevention

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BTU Rating: 180000

160000

180000

199000

Outdoor Vent Cap for Signature Series Gas Tankless Water Heaters

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The A. O. Smith's Signature Series, Premium Condensing Gas Tankless line of water heaters, with X3® Scale Prevention Technology, sets a new standard for flexible, efficient, and long-lasting tankless water heating. This product line features our patented X3 ® Scale Prevention Technology, which reduces and eliminates scale buildup due to hard water conditions. This line of water heaters also comes loaded with premium features, such as an integrated recirculation pump, patented heat exchanger, enhanced installation flexibility, and highly efficient performance, making hot water available within an instant at your convenience.

A.O. Smith Signature Series Super High Efficiency 10.6-GPM 180000-BTU Indoor-Outdoor Natural Gas-Propane Tankless Water Heater with Scale Prevention

A. O. Smith Signature® Series Premium Condensing Gas Tankless water heater with X3 scale prevention technology and built-in recirculation pump offers customers instant hot water and peace of mind. The X3® scale prevention technology reduces and eliminates scale build-up caused by hard water conditions and lasts up to 3 times longer than models without this technology. The built-in recirculation pump offers customers the option to set two recirculation schedules to ensure hot water is ready during peak demand hours. Signature Series Premium Condensing Gas Tankless allows customers the flexibility to install indoors and outdoors. Call 1-877-GOLowes to get this water heater installed.

Premium condensing gas tankless water heaters deliver on-demand performance.
Control Display to set and review recirculation schedules, status, and error codes.
Single stainless steel, heavy-duty heat exchanger design eliminates most internal welds and improves overall reliability.
Recirculation mode, activates the pump to keep your water lines warm, reducing the time it takes for the hot water to arrive at the fixture.
The X3® Scale Prevention Technology works by inhibiting scale formation within the heat exchanger tubing of the unit, with the built in X3® Cartridge media.
X3® Scale Prevention Technology reduces the formation of scale in the heat exchanger, extending the operating life of the unit in typical potable water installations.
180,000 BTU
15 Year Warranty for M & X3 models - see Warranty Guide for more information

General
Series Name	X3	Display Type	Digital
Type	Tankless	Fuel Type	Natural gas/Liquid propane
Power Source	Gas	Installation Type	Wall mount
Grade	Residential	Vent Type	PVC/CPVC
Use Location	Indoor/Outdoor

Dimensions
Depth (Inches)	16.1	Water Connection Size	3/4-in
Family Size	5	Weight (lbs.)	104
Height (Inches)	44.6	Width (Inches)	16.5

Features
Annual Fuel Utilization Efficiency % (Percentage)	0	Point of Use	No
BTU Rating	180000	Scale Prevention	Yes
Grid Capable	No	Super High Efficiency	Yes
Installation Location	Wall	Uniform Energy Factor	0.95
Maximum Gallons per Minute	10.5

Compatibility
Bluetooth Compatibility	No	Works with iOS	No
Smart Compatible	No	Works with SmartThings	No
Wi-Fi Compatibility	No	Works with the Google Assistant	No
Works with Amazon Alexa	No	For Use with Mobile Homes	Yes
Works with Android	No	For Use with RVs	No
Works with Apple HomeKit	No

Warranty
Warranty	15-year limited

Certifications
CA Residents: Prop 65 Warning(s)	Prop 65 WARNING(S) -	AHRI Certified	Yes
ENERGY STAR Certified	Yes	AHRI Certification Number	213881207
Safety Listing	CSA safety listing

Miscellaneous
UNSPSC	40101800

Review

4.8 out of 5

6 Reviews

3 Star

2 Star

1 Star

100% Recommend this product

Ratings may include incentivized customer reviews.

6 Customer Reviews

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It is heavy.

Would Recommend

The water heater works great. It was not too hard to install.

HmcdMarch 29, 2026
Verified Purchaser

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Endless efficient hot water supply

Would Recommend

It's efficient for having hot water for dishes and showers laundry for a full household and far more space saving than the old traditional water heater.

AliceMarch 13, 2026
From Signature Series Super High Efficiency 10.6-GPM 199000-BTU Indoor-Outdoor Natural Gas-Propane Tankless Water Heater with Scale Prevention Verified PurchaserIncentivized

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You get hot water quick.

Would Recommend

Great product

ElizabethJanuary 28, 2026
From Signature Series Super High Efficiency 10.6-GPM 160000-BTU Indoor-Outdoor Natural Gas-Propane Tankless Water Heater with Scale Prevention Verified Purchaser

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Works great!

Would Recommend

Works great!

CaseyJune 13, 2025
From Signature Series Super High Efficiency 10.6-GPM 199000-BTU Indoor-Outdoor Natural Gas-Propane Tankless Water Heater with Scale Prevention

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