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A.O. Smith Signature Series 8-GPM 190000-BTU Indoor Natural Gas/Liquid Propane Ultra-Low NOx Tankless Water Heater

Name: A.O. Smith Signature Series 8-GPM 190000-BTU Indoor Natural Gas/Liquid Propane Ultra-Low NOx Tankless Water Heater
Brand: A.O. Smith
SKU: 1000601683
Rating: 3.6 (240 reviews)

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3.6

240

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BTU Rating: 190000

190000

199000

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A. O. Smith's Signature Series Indoor Tankless Gas Water Heater uses up to 190,000 BTU/h of natural gas or propane to deliver a 8 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. Tankless Gas water heaters only heat water when needed, making them one of the most energy efficient ways to heat water. This high efficiency non-condensing indoor model has a 0.81 Uniform Energy Factor (UEF) and can reduce your energy consumption and save money on your energy bills. The compact design can be easily wall-mounted indoors, 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 hot water for up to 2 showers and 3 sinks when sized appropriately (based on a 0.5 GPM faucet and a 2.5 GPM showerhead in the southern zone)
Operates at a 0.81 Uniform Energy Factor (UEF) for maximum energy efficiency and cost savings on this Ultra Low NOx indoor model
Frees up valuable storage space with compact, indoor 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
Features integrated controls for easy temperature control and troubleshooting
Primary heat exchanger design provides superior heat transfer and protection for extended product life
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/Liquid propane	Use Location	Indoor
Grade	Residential	Installation Type	Wall mount
Ignition Type	Electric	Series Name	Signature Series
Vent Type	Concentric

Dimensions
Vent Diameter(s)	5-in	Width (Inches)	13.75
Depth (Inches)	11.5	Family Size	5
Height (Inches)	20.5	Water Connection Size	3/4-in
Weight (lbs.)	55

Features
Maximum Gallons per Minute	8	Super High Efficiency	No
Point of Use	No	Grid Capable	No
Emission Rating	Ultra Low NOx	Scale Prevention	No
Uniform Energy Factor	.81	Installation Location	N/A (Portable)
BTU Rating	190000	High Efficiency	Yes

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	No	Safety Listing	CSA safety listing

Miscellaneous
UNSPSC	40101800

Check out the Best Selling Water Heaters on Lowes.com

Review

3.6 out of 5

240 Reviews

69% Recommend this product

Ratings may include incentivized customer reviews.

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+ 3

What Customers Are Saying

The product provides quick heating and endless hot water, with a compact design. However, some customers have experienced issues such as error codes, igniter failure, and inconsistent hot water. Installation can also be challenging due to the need for additional accessories. Concerns have been raised about noise levels and responsiveness of customer support.

Customer review summary generated by AI, including incentivized reviews.

240 Customer Reviews

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shouldn't buy

Would Not Recommend

BMSeptember 4, 2026

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Response from Published by the A. O. Smith Team

We are sorry to hear of your experience. We want to ensure the issue is resolved.

Please send your phone number to talktous@aosmith.co...

Published by the A. O. Smith TeamSeptember 8, 2026

Top notch customer service!

Would Recommend

Had to purchase a new water heater. High stress level when this kind of thing happens! However, Tom, in electric was courteous and professional. He did an amazing job helping us find exactly what we needed. Give this guy a Raise!!!!

MamaBAugust 5, 2026
Verified Purchaser

Was this Review Helpful ?

Once installed it's doing a great job.

Would Recommend

Only been installed four (4) days but performing perfectly.

WinceJuly 30, 2026

From aosmith.com

It is great

Would Recommend

Never run out ot hot water. Best thing we ever did for our family.

kirkbJuly 6, 2026

From aosmith.com

So much better!

Would Recommend

Absolutely loving this tankless heater. Takes up way less space and gives effectively endless hot water.

JoshJune 5, 2026

From aosmith.com

Easy install

Would Recommend

Product was a direct upgrade replacement for my outdated tankless water heater.

Dan GApril 28, 2026
Verified Purchaser

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/4d3b77a7-bf41-5d34-b481-f6785726ae2b

Was this Review Helpful ?

Unit is quite and delivers hot water quickly.

Would Recommend

Contractor installation went great and saved me a lot of labor. The one vent/air pipe really saved time.

Happy HoosierApril 23, 2026
Verified Purchaser

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88 Questions

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