Name: A.O. Smith Signature 100 40-Gallon Tall 6-year Warranty 3800-Watt Double Element Electric Water Heater
Brand: A.O. Smith
SKU: 1002746870
Price: 469 USD
Availability: InStock
Rating: 4.5 (132 reviews)

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A. O. Smith's Signature 100 Series 40-Gallon Electric Water Heater is designed to provide efficient and reliable hot water for households with 2 to 3 people when sized appropriately. Designed to last, it features dual copper heating elements, a protective anode rod and a ceramic fused tank shield to reduce corrosion and provide ultimate tank protection. It also has a self-cleaning dip tube to help prevent sediment build-up and extend the overall life of the water heater. This added protection comes with a 6-year limited warranty to give you additional peace of mind. Want to save money on your energy bills? This electric hot water heater operates at a 0.92 Uniform Energy Factor (UEF) which can reduce your energy consumption compared to less efficient models. Call 1-877-GOLowes to get this water heater installed.

Delivers the ideal amount of hot water for households with 2 to 3 people when sized appropriately
Features two 3,800-watt copper heating elements that provide a first hour delivery of 53 gallons
Operates at a 0.92 Uniform Energy Factor for maximum energy-efficiency and cost savings
Tall, slim 61.25-in H x 18-in diameter profile enables easier installation in narrow spaces
Provides superior tank protection and extends water heater life with premium heating elements, anode rod and fused ceramic tank shield
Reduces heat loss with non-CFC polyurethane foam insulation and factory-installed heat trap nipples for maximum efficiency and energy savings
Features easy temperature control with adjustable thermostat you can set higher or lower for dishwashers and laundry machines
Comes with temperature and pressure relief valve for top installation
Provides peace of mind with a 6-year limited tank and parts guarantee and a 1-year limited labor warranty

General
Series Name	Signature 100	Grade	Residential
Type	Tank	Use Location	Indoor
Power Source	Electric

Dimensions
Depth (Inches)	18	Nominal Capacity (Gallons)	40
Diameter (Inches)	18	Rated Storage Capacity	36-Gallon
Family Size	3	Water Connection Size	3/4-in
Height (Inches)	61.25	Weight (lbs.)	118
Insulation Thickness (Inches)	2	Width (Inches)	18

Features
Annual Fuel Utilization Efficiency % (Percentage)	0	Super High Efficiency	No
Foam Insulation	Yes	Temperature and Pressure Relief Valve	Yes
GPH Recovery at 90 Degrees F (Gallons)	17.5	Uniform Energy Factor	0.92
Grid Capable	No	Voltage (Volts)	240
Hybrid Heat Pump Technology	No	Water Connection Location	Top
Point of Use	No	Water Heater Style	Tall
Scale Prevention	No

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	6-year limited

Certifications
CA Residents: Prop 65 Warning(s)	Prop 65 WARNING(S) -	Safety Listing	UL safety listing
ENERGY STAR Certified	No	AHRI Certified	Yes

Miscellaneous
UNSPSC	40101800

Check out the Best Selling Water Heaters on Lowes.com

Review

4.5 out of 5

132 Reviews

93% Recommend this product

Ratings may include incentivized customer reviews.

Read All Reviews

What Customers Are Saying

Customers overwhelmingly praise this water heater for reliable performance, effortless installation, and strong value. Most highlight how simple the setup was, with connections matching perfectly and minimal adjustments needed. Reviewers consistently report ample, consistent hot water output, with the 40-gallon capacity and 3800-watt element heating rapidly even in smaller homes. Many replaced units that served over two decades, noting improved performance. Several chose based on brand reputation for durability and longevity. A few mention concerns about the plastic drain valve durability or isolated noise issues, but these are rare exceptions to overwhelmingly positive feedback.

Customer review summary generated by AI, including incentivized reviews.

132 Customer Reviews

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Would Recommend

VERY GOOD

YURIZAYSeptember 7, 2026
From Signature 100 50-Gallon Tall 6-year Warranty 3800-Watt Double Element Electric Water Heater Verified Purchaser

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Would Recommend

WN721July 21, 2026
From Signature 100 50-Gallon Tall 6-year Warranty 3800-Watt Double Element Electric Water Heater Verified Purchaser

https://photos-us.bazaarvoice.com/photo/2/cGhvdG86bG93ZXM/8c08dd12-0eb0-5035-a55f-67aaba9354cc

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New

Would Recommend

Easy to purchase and pickup

LoB22April 16, 2026
Verified Purchaser

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Great

Would Recommend

THE CONTRACTOR OF MY NEW HOUSE INSTALED AND WE ARE HAPPY.

Ana18March 19, 2026

From aosmith.com

THE PRICE IS GOOD AND ITS A AWESOME TANK

Would Recommend

JoeybellaMarch 5, 2026
From Signature 100 50-Gallon Tall 6-year Warranty 3800-Watt Double Element Electric Water Heater Verified Purchaser

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		Name	Current Item A.O. SmithSignature 100 40-Gallon Tall 6-year Warranty 3800-Watt Double Element Electric Water Heater
		Ratings	132
		Type	Tank
		Height (Inches)	61.25
		Power Source	Electric
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