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The New Generation of Signature Series™ Water Heaters
from A. O. Smith

For over a century, A. O. Smith has been a technology innovation leader. That tradition continues to this day
with our Signature Series water heaters, available exclusively at Lowe's.

A. O. Smith's Signature Series features a full line of electric, gas, tankless and heat pump water heaters designed to be innovative and efficient without sacrificing value and quality. An A. O. Smith water heater will provide your family with a reliable heating solution for years to come, and that's why we're America's most trusted water heater brand.

NEW Smart Electric Water Heater Technology

Get smarter hot water from A. O. Smith. Now offering A. O. Smith’s smart electric water heaters that can detect, protect and monitor your water heater against leaks giving you ultimate peace of mind.

  • Leak Watch™

    Leak Watch™ continuously monitors your water heater and alerts you if a leak is detected.

  • Leak Shield™

    Leak Shield™ automatically shuts off your water supply to protect your home when a leak is detected.

  • iCOMM™ Smart Connectivity

    iCOMM™ Smart Connectivity lets you monitor & manage your water heater remotely with the click of a button using the A. O. Smith app.

Signature Series Products

SIGNATURE 100™ SERIES

Dependable Hot Water

The Signature™ 100 Series provides dependable hot water at an affordable cost and a 6-year limited warranty.

SIGNATURE 300™ SERIES

Smart Water Heaters with Leak Detection

The Signature™ 300 Series features smart water heaters with iCOMM™ smart connectivity, Leak Watch™ leak detection and a 9-year limited warranty.

SIGNATURE 500™ SERIES

Smart Water Heaters with Leak Detection & Protection

The Signature™ 500 Series features smart water heaters with iCOMM™ smart connectivity, Leak Watch™ leak detection, Leak Shield™ automatic shut-off and a 12-year limited warranty.

SIGNATURE 900™ SERIES

Advanced Energy Savings

The Signature™ 900 Series heat pump technology is 3X as efficient as standard electric technology-saving you up to $454 per year on your energy bills and a 10-year limited warranty.

Electric Water Heaters FAQ

  • Electric water heaters use a dip tube to bring cold water into the bottom of the water tank where heating elements heat and keep the water warm. Heated water rises to the top of the tank where it exits and heads to your faucets. Although some standard gas-fueled tank water heaters do not require an electric connection, an electric water heater does require an electric connection.

  • There are several things that can affect the life of your electric water heater, including whether you have hard or soft water in your home and whether you've followed the maintenance schedule recommended by your manufacturer, including routine inspection and replacement when needed of the unit’s anode rod.

  • While electric water heaters can often outlast their warranty depending on use, water quality and maintenance, it's usually a good idea to think about upgrading to a newer model if your water heater is more than 12 years old.

  • Calculations to determine the size of electric water heater you require are the same as those for a gas heater. Calculating the demand at your household's peak usage hour can help you determine how many gallons you typically use in a single peak hour. Once you've determined that number, you'll know what tank size will work for your household. Typically, these guidelines work for most households:

    • One to two people: 30 gallons
    • Two to three people: 40 gallons
    • Three to four people: 50 gallons
  • Whether you're replacing an old electric heater or installing a brand new one, it's important to turn off the electricity at the circuit breaker before you begin, and make sure it's off by testing it with a circuit tester. Always follow the installation manual or consult a Lowe's plumbing contractor when installing your new water heater. While installing your water heater we recommend considering the following:

    1. Installation or replacement of a drain pan
    2. Installing or replacing an expansion tank
    3. Inspect and replace electrical lines
    4. Make sure your T&P valve is properly drained per your local codes
    5. Verify that the incoming water pressure is at the recommended pressure per your local codes

    ALWAYS READ ALL SAFETY INSTRUCTIONS IN THE INSTALLATION MANUAL CAREFULLY BEFORE INSTALLING

resources & information

SIGNATURE 100™ SERIES

Dependable Hot Water

The Signature™ 100 Series provides dependable hot water at an affordable cost and a choice of a 6-, 9- or 12-year limited warranty.

SIGNATURE 300™ SERIES

ENERGY STAR® Certified

The Signature™ 300 Series ENERGY STAR® certified water heaters deliver efficient, reliable hot water with a 12-year limited warranty.

SIGNATURE 500™ SERIES

Energy Savings

The Signature™ 500 Series offers ENERGY STAR® high efficiency water heaters that can deliver as much as $43 per year in energy savings when compared to standard models.

Gas Water Heaters FAQ

  • Fueled by a gas-powered flame that sends hot air through a centrally located chimney, heat warms up water in the tank so that when you turn on your hot water tap, hot water comes out. As you remove water from the tank, cold water flows into the bottom of your heater to replenish the supply through a dip tube. Because heat comes from the gas-powered flame, some gas water heater models work even if your power is out.

  • There are several things that can affect the life of your gas water heater, including whether you have hard or soft water in your home and whether you've followed the maintenance schedule recommended by your manufacturer, including routine inspection and replacement when needed of the unit’s anode rod.

  • While gas water heaters can often outlast their warranty depending on use, water quality and maintenance, it's usually a good idea to think about upgrading to a newer model if your water heater is more than 12 years old. Scale and sediment build-up over time can compromise a heater’s efficiency and lead to wear-out and newer units offer not only improved efficiency but advances in connectivity and protection.

  • The size of your gas water heater should depend on how much water you typically use. During the hour when you use the most hot water, which is typically in the evening when you're washing dinner dishes and bathing children, you can monitor usage to determine the right size. However, you can estimate it by the number of people in your home. Typically, these guidelines work for most households:

    • One to two people: 30 gallons
    • Two to three people: 40 gallons
    • Three to four people: 40 gallons
    • More than five people: 50 gallons or more
  • Installing a gas water heater is a difficult process that's typically best to leave to a licensed professional. However, if you're mechanically inclined and want to tackle it yourself, always follow the instruction manual. While installing your water heater we recommend considering the following:

    1. Installation or replacement of a drain pan
    2. Installing or replacing an expansion tank
    3. Inspect and replace electrical lines
    4. Make sure your T&P valve is properly drained per your local codes
    5. Verify that the incoming water pressure is at the recommended pressure per your local codes

    ALWAYS READ ALL SAFETY INSTRUCTIONS IN THE INSTALLATION MANUAL CAREFULLY BEFORE INSTALLING

resources & information

ELECTRIC TANKLESS

Continuous Hot Water & Space Savings

Electric Tankless water heaters provide continuous hot water when sized appropriately for the application. See power requirements.

GAS TANKLESS

Save Energy, Save Money, Save Space

Gas Tankless water heaters are compact in size, provide continuous hot water and reduce your water heating costs by up to 33% compared to standard gas water heaters.

Tankless Water Heaters FAQ

  • Tankless water heaters heat water instantly as it flows into your home. They're ideal for smaller spaces that don't have additional room for a gas or electric water heater but also work well in large homes where hot water usage is high, as homeowners don't need to limit themselves to the tank's hot water capacity during peak usage times. Power requirements for gas and electric tankless water heaters are unique for each unit.

  • Using an electric element or gas burner, water is heated as it travels through a heat exchanger. Because the water is heated as it passes by the element or burner, there's no need for water storage.

  • Tankless water heaters typically outlast gas and electric tank heaters. In most cases, their parts are replaceable, which adds to their longevity. As with tank-style heaters, the longevity of a tankless heater depends on water conditions, use and maintenance practices. Routine descaling is particularly important to the longevity and efficiency of tankless water heaters.

  • Tankless water heaters are designed to heat water as you need it. They are more energy-efficient, and therefore, more cost-efficient, than traditional water heaters that continually run to heat the water in the tank. They are much smaller than a traditional hot water heater because they don’t have to store 40 - 80 gallons of water, giving you more options where to install your tankless water heater.

  • There are two main considerations to make when selecting a tankless water heater: flow rate and temperature rise. Flow rate, which is measured in gallons per minute (GPM) is determined by figuring out how you'll use water and how much hot water you'll need at one time. Your temperature rise is how much your heater must increase the temperature of your groundwater before it comes through your faucets. Higher flow rates and greater temperature rises require a larger, more powerful tankless water heater.

  • There are several important steps to installing a tankless water heater and in many cases, enlisting the help of a licensed plumber and/or electrician is recommended. If you're experienced and comfortable doing it on your own, be sure to follow local plumbing and electrical codes and always follow the installation manual. The steps to take when installing a new tankless heater are:

    1. Upgrade the gas line
    2. Remove the old heater, if applicable
    3. Mount your tankless water heater
    4. Install the gas line and new water lines
    5. Install the pressure relief valve and exhaust vent
    6. Turn the water on

    ALWAYS READ ALL SAFETY INSTRUCTIONS IN THE INSTALLATION MANUAL CAREFULLY BEFORE INSTALLING