A. O. Smith
A.O. Smith Signature 100 Tall 6-Year Warranty 4500-Watt Double Element Electric Water Heater
$399.00 / each · 1 unit
In stock — limited-time offer
Nominal Capacity (Gallons): 30 Gal
Choose your delivery
Best Price. Guaranteed
Find a lower price on an exact item? We'll match it. Some exclusions apply.
Price GuaranteeFREE Returns
Return it in store or ship it back for free. Eligibility rules apply.
Return PolicyPay Your Way
Credit card, PayPal or Buy Now, Pay Later options available at checkout.
Payment OptionsOverview
A. O. Smith's Signature 100 Series Tall Electric Water Heater is designed to provide efficient and reliable hot water for households with 3 to 5 people when sized appropriately. Designed with longevity in mind, it features dual copper heating elements, a protective anode rod and a ceramic fused tank shield designed to reduce corrosion and provide ultimate tank protection.
A self-cleaning dip tube reduces sediment build-up and extends 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 water heater operates at a 0.93 Uniform Energy Factor (UEF) which can reduce your energy consumption compared to less efficient models.
- Delivers the ideal amount of hot water for households with 3 to 5 people when sized appropriately
- Features two 4,500-watt copper heating elements that provide a first hour delivery of up to 72 gallons
- Operates at a 0.93 Uniform Energy Factor for maximum energy-efficiency and cost savings
- Tall, slim 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
- Features easy temperature control with an adjustable thermostat you can set higher or lower for dishwashers and laundry machines
- Provides peace of mind with a 6-year limited tank and parts guarantee and a 1-year limited labor warranty
- Factory-installed temperature and pressure relief valve and tamper-proof drain valve ensures safe operation
Product Features
Two 4,500-watt copper heating elements work together for fast recovery, delivering up to 72 gallons in the first hour so back-to-back showers never run cold.
Tall, slim profile slides into narrow closets, alcoves and utility corners where a standard-diameter tank simply will not fit.
Ceramic fused tank shield bonded to the steel interior forms a hard, glass-like barrier that resists corrosion for the life of the tank.
0.93 Uniform Energy Factor paired with thick non-CFC polyurethane foam insulation keeps standby heat loss — and your monthly bill — low.
A protective anode rod attracts corrosive minerals in your water supply so they attack the rod instead of the tank wall.
Backed by a 6-year limited tank and parts warranty plus a 1-year limited labor warranty for real peace of mind.
The self-cleaning dip tube creates turbulence at the base of the tank, sweeping sediment out before it can bake onto the elements.
Factory-installed heat trap nipples stop hot water from creeping into the supply lines, cutting wasted heat between draws.
An easy-access adjustable thermostat lets you dial the temperature up for dishwashers and laundry, or down to save energy.
Factory-installed T&P relief valve and a tamper-proof brass-style drain valve keep operation safe and routine flushing simple.
UL safety listed and approved for use in manufactured and mobile homes — a dependable choice for nearly any residential install.
Specifications
General
| Series Name | Signature 100 |
| Type | Tank |
| Power Source | Electric |
| Grade | Residential |
| Use Location | Indoor |
| Color/Finish Family | White |
| Water Heater Style | Tall |
Dimensions
| Nominal Capacity (Gallons) | 30 / 40 / 50 / 55 |
| Height (Inches) | 47.5 – 56.5 |
| Diameter (Inches) | 20 – 24 |
| Insulation Thickness (Inches) | 2 |
| Water Connection Size | 3/4-in |
| Family Size | 3 to 5 people |
Performance
| Wattage (Watts) | 4500 |
| Number of Elements | 2 (double element) |
| Element Material | Copper |
| Uniform Energy Factor | 0.93 |
| First Hour Delivery (Gallons) | up to 72 |
| Voltage (Volts) | 240 |
| Thermostat | Adjustable |
Features
| Self-Cleaning Dip Tube | Yes |
| Ceramic Fused Tank Shield | Yes |
| Protective Anode Rod | Yes |
| Foam Insulation | Yes (non-CFC) |
| Heat Trap Nipples | Factory installed |
| T&P Relief Valve | Factory installed |
| Tamper-Proof Drain Valve | Yes |
Warranty & Certifications
| Tank & Parts Warranty | 6-year limited |
| Labor Warranty | 1-year limited |
| Safety Listing | UL safety listing |
| For Use with Mobile Homes | Yes |
Manuals & Documents
Reviews
| 5 | 60 | |
|---|---|---|
| 4 | 31 | |
| 3 | 30 | |
| 2 | 0 | |
| 1 | 0 |
Showing 1 - 11 of 121 reviews
- Verified
Straight swap, done in two hours
Replaced a 13-year-old tank of the same size. Connections lined up with my existing flex lines and the height was within an inch of the old unit, so nothing had to be re-plumbed. Hot water was back before dinner.
Randy P. · Knoxville, TN · July 2, 2026
- Verified
Recovery is much faster than my old heater
Family of four, two teenagers, back-to-back showers every morning. The 50-gallon keeps up easily and reheats far quicker than the single-element unit it replaced.
Melissa H. · Dayton, OH · June 26, 2026
- Verified
Good value, bring a dolly
Quality feels a step above the builder-grade heaters I've installed before - thicker insulation and a proper drain valve. Only note is that it's heavy, so plan on help getting it into place.
Guillermo A. · San Antonio, TX · June 18, 2026
- Verified
Slim profile fit my closet perfectly
My utility closet is narrow and most 50-gallon tanks were too wide. The tall version slid right in with room to service the elements. Very happy with the fit and finish.
Karen S. · Allentown, PA · June 9, 2026
- Verified
Bill went down right away
Coming from a 20-year-old tank with almost no insulation left, the difference showed up on the very first statement. It also holds temperature much better overnight.
Doug W. · Boise, ID · June 1, 2026
- Verified
Quiet and consistent
You barely hear it working. Water temperature stays exactly where I set it and there's no lukewarm stretch halfway through a bath like the old one had.
Ashley T. · Greenville, SC · May 24, 2026
- Verified
Solid unit, clear instructions
The installation manual was actually useful and the factory heat trap nipples saved me a step. Wiring the double elements was simple for anyone comfortable with a 240V circuit.
Michael O. · Peoria, IL · May 15, 2026
- Verified
Great size for a family of three
The 40-gallon is plenty for us, including a dishwasher and washing machine running in the evening. Recovery is quick enough that we never plan around it.
Yvette R. · Albuquerque, NM · May 6, 2026
- Verified
Six-year warranty and a real drain valve
I appreciate that they used a tamper-proof brass-style drain instead of cheap plastic. Flushed it after the first month and it drained cleanly with no sediment.
Steve K. · Rochester, NY · April 27, 2026
- Verified
Second one I've bought
Put the 55-gallon in our main house two years ago and just added a 30-gallon for the guest apartment. Same reliable performance from both - no complaints at all.
Bianca L. · Jacksonville, FL · April 19, 2026
- Verified
Hot water for a busy household
Five of us and nobody runs out anymore. The thermostat adjustment is easy to reach, and I set it slightly higher for the dishwasher without any issues.
Terrell J. · Baton Rouge, LA · April 8, 2026
