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ENERGY STAR Certified

Warranty: 15-year limited

Super High Efficiency

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A.O. Smith Signature Series Super High Efficiency 6.6-GPM 160000-BTU Outdoor Natural Gas Ultra-Low NOx Tankless Water Heater

Name: A.O. Smith Signature Series Super High Efficiency 6.6-GPM 160000-BTU Outdoor Natural Gas Ultra-Low NOx Tankless Water Heater
Brand: A.O. Smith
SKU: 1000601669
Rating: 5 (14 reviews)

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BTU Rating: 160000

160000

199000

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A. O. Smith's Signature Series Outdoor Tankless Natural Gas Water Heater uses up to 160,000 BTU/h of natural gas to deliver a 6.6 gallons per minute flow rate (based on a 35°F rise) of continuous hot water for your home when sized appropriately. This makes it a good match for whole home applications. It only heats water when needed, making this unit one of the most energy efficient ways to heat water. This super high efficiency condensing outdoor model has a 0.95 Uniform Energy Factor (UEF) and can reduce your energy consumption and save money on your energy bills. Additionally, our tankless design can be easily wall-mounted outside, saving you valuable storage space. This model may qualify for additional energy efficiency rebates and tax credits in your local area. See Lowe's Rebate Center for details. Tankless gas water heaters have special installation requirements. Professional installation is required. Call 1-877-GOLowes to get this water heater installed.

Delivers continuous hot water for up to 2 showers and 3 sinks when sized appropriately (0.5 GPM faucet and a 2.5 GPM showerhead in the southern zone)
Operates at a 0.95 Uniform Energy Factor (UEF) for maximum energy efficiency and cost savings on this Ultra Low NOx outdoor model
Frees up valuable storage space with compact, outdoor wall-mounted design
Professional installation required - call 877-GO-LOWES
Uses a 3/4 inch gas line and includes a kit for easy conversion from natural gas to propane
Includes remote controller for easy temperature adjustment and troubleshooting
Copper primary heat exchanger and stainless steel secondary heat exchanger provide superior heat transfer and protection for maximum durability
Worry-free safety features include freeze, overheat and surge protection as well as troubleshooting diagnostic codes
Provides peace of mind with a 15-year heat exchanger guarantee, 5-year parts guarantee and a 1-year limited labor warranty

General
Type	Tankless	Power Source	Gas
Fuel Type	Natural gas	Use Location	Outdoor
Grade	Residential	Installation Type	Wall mount
Ignition Type	Electric	Series Name	Signature Series
Vent Type	None required

Dimensions
Depth (Inches)	11.25	Width (Inches)	17.75
Height (Inches)	23.63	Family Size	5
Weight (lbs.)	69	Water Connection Size	3/4-in

Features
Maximum Gallons per Minute	6.6	Super High Efficiency	Yes
Point of Use	No	Grid Capable	No
Emission Rating	Ultra Low NOx	Scale Prevention	No
Uniform Energy Factor	.95	Installation Location	N/A (Portable)
BTU Rating	160000	High Efficiency	No

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

Warranty
Warranty	15-year limited

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

Miscellaneous
UNSPSC	40101800

Check out the Best Selling Water Heaters on Lowes.com

Review

5 out of 5

14 Reviews

4 Star

3 Star

2 Star

1 Star

100% Recommend this product

Ratings may include incentivized customer reviews.

14 Customer Reviews

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Facil de instalar

Would Recommend

Es economic y pequeno

March 31, 2026
Verified Purchaser

Was this Review Helpful ?

Make sure you have 3/4 inch gas to hook up

Would Recommend

Easy installation. Great warranty

AndrewFebruary 1, 2026
From Signature Series Super High Efficiency 10-GPM 199000-BTU Outdoor Natural Gas Ultra-Low NOx Tankless Water Heater Verified Purchaser

Was this Review Helpful ?

Love it!

Would Recommend

Works great!! Unable to review it was installed yesterday! I’m trying to register my product!

NoneOctober 15, 2023

From aosmith.com

Definitely a good choice

Would Recommend

This product is great. Easy to install and what’s most important, it feel’s solid and built well.

LaliSeptember 26, 2023
Verified PurchaserIncentivized

Was this Review Helpful ?

Better than the one I replaced.

Would Recommend

Ease of installation

Coastal DIYerMay 21, 2023
Verified Purchaser

Was this Review Helpful ?

Overall the installation wasn’t too difficult!

Would Recommend

The instructions included were quite accurate and easy to follow for the avg. DIY! The initial test run after completing the install appears to as designed and explained in the manual. Normal operation will be tested tonight!

CJBJrJanuary 16, 2023

From aosmith.com

Excellent heater

Would Recommend

Handles dishwasher, washing machine, bath, and shower at same time. Only shortcoming is the lower heater cover is no longer available and had to make one. Love this natural gas heater.

jimboNovember 4, 2021

Was this Review Helpful ?

Fantastic

Would Recommend

I love the way it works and is not wasting my gas all day long "only when is running

GhostJanuary 2, 2021

From aosmith.com

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COMPARE PRODUCTS

		Name	Current Item A.O. SmithSignature Series Super High Efficiency 6.6-GPM 160000-BTU Outdoor Natural Gas Ultra-Low NOx Tankless Water Heater
		Ratings	14
		Type	Tankless
		Fuel Type	Natural gas
		Height (Inches)	23.63
RinnaiSuper High Efficiency Plus Condensing Residential 7.1-GPM 130,000 BTU Natural Gas or Liquid Propane Indoor/Outdoor Tankless Water Heater	A.O. SmithSignature Series 6.6-GPM 160000-BTU Indoor Natural Gas Ultra-Low NOx Tankless Water Heater	A.O. SmithSignature Series Super High Efficiency 10-GPM 199000-BTU Indoor Natural Gas Ultra-Low NOx Tankless Water Heater	A.O. SmithSignature Series 6.6-GPM 160000-BTU Outdoor Liquid Propane Ultra-Low Nox Tankless Water Heater	RinnaiSuper High Efficiency Plus Condensing Residential 11.1 GPM 199,000 BTU Natural Gas or Liquid Propane Indoor/Outdoor Tankless Water Heater	A.O. SmithSignature Series 10-GPM 199000-BTU Outdoor Natural Gas/Liquid Propane Ultra-Low NOx Tankless Water Heater	A.O. SmithSignature Series Super High Efficiency 10.5-GPM 199,000-BTU Indoor-Outdoor Condensing Propane Tankless Water Heater	A.O. SmithSignature Series Super High Efficiency 10.5-GPM 160,000-BTU Indoor-Outdoor Condensing Natural Gas Tankless Water Heater	A.O. SmithSignature Series Super High Efficiency 10.5-GPM 199,000 BTU Indoor-Outdoor Condensing Natural Gas Tankless Water Heater
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Natural gas	Natural gas	Natural gas	Liquid propane	Natural gas	Natural gas/Liquid propane	Natural gas	Natural gas	Natural gas
30.11	23.63	23.63	23.63	30.11	20.5	32.5	32.5	32.46