Is AO Smith a good brand for water heaters?

A. O. Smith Corporation is one of the world's leading manufacturers of residential and commercial water heating equipment, headquartered in Milwaukee, Wisconsin since its founding in 1874. The publicly traded company (NYSE: AOS) has grown through strategic acquisitions to own major brands including State Water Heaters, Lochinvar, Takagi, Reliance, and Aquasana. A. O. Smith also operates one of the largest water treatment businesses globally, with significant market presence in North America, China, and India.

Where is AO Smith made?

AO Smith is based in United States, headquartered in Milwaukee, Wisconsin.

AO Smith Water Heaters

Q: What warranty does AO Smith offer on water heaters?

AO Smith offers 6-year standard warranty on residential models; 10-year on select ProLine series; commercial warranties vary by model.

A. O. Smith is an industry leader offering a complete range of residential and commercial water heaters including tank, tankless, heat pump, and solar models. Their Vertex line achieves up to 96% thermal efficiency, and the Cyclone series is a commercial workhorse. ProLine and Signature series cover standard residential needs with strong warranty support.

Founded 1874 United States 6-year standard warranty on residential models; 10-year on select ProLine series; commercial warranties vary by model Official Website

AO Smith Water Heaters Product Lines

ProLine ProLine XE Signature Series Vertex Cyclone DERA Voltex (Heat Pump)

Certifications & Standards

Energy Star UL Listed NSF Certified CSA Certified

Water Heaters How-To Guides

View All →

How to Adjust Water Temperature

Set your gas or electric water heater thermostat to the right temperature for comfort, safety, and lower energy bills -- plus how to verify the actual output with a thermometer.

How to Choose the Right Size Water Heater

Calculate the right water heater size so you never run out of hot water -- covers first-hour rating for tanks, GPM for tankless, quick sizing charts, and the mistakes that leave people taking cold showers.

How to Flush Your Water Heater

Flush sediment from your tank water heater to cut energy bills, eliminate rumbling noises, and add years to its life -- the most important maintenance task most homeowners skip.

Common Water Heaters Problems

View All →

Leaking Water Heater

Water around the base demands immediate attention -- floor damage, mold, electrical hazards. Could be loose fittings, a failing T&P valve, a bad drain valve, or a rusted-through tank that needs replacement.

No Hot Water

No hot water from any fixture? Cause depends on gas vs. electric. Common culprits: pilot light out, tripped breaker, failed element, faulty thermostat or gas valve.

Pilot Light Won't Stay Lit

Lights but will not stay lit? Almost always the thermocouple -- a safety sensor that detects the pilot flame. When it fails, the gas valve shuts off. Straightforward DIY repair, under $25.