AO Smith Water Heaters

Everything you need on AO Smith Water Heaters, including model details, industry rankings and customer reviews, all in one place.

AO Smith Water Heater Overview

A.O. Smith Corporation manufactures residential and commercial water heating equipment. The company, headquartered in Milwaukee, Wisconson, has sales and distribution in over 60 countries and employs approximately 11,400 men and women worldwide. A.O. Smith trades under AOS on the NYSE and had net sales of $3 billion in 2017.

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Consumer Reviews of AO Smith


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #14 of 51 Water Heaters
  • 34.85% of customers recommended

Reviews by Water Heater Series

Energy Saver ProMax Vertex

Corporate History

A.O. Smith was created in 1874. Over the years, they have manufactured parts for baby carriages, bicycles, and automobiles. In 1936, A.O. Smith patented its glass-lined water tank and started mass production of these tanks in 1939. In 2001, A.O. Smith acquired State Industries, Inc., which nearly doubled the size of its water heater business. They purchased GSW Inc. and American Water Heater Company in 2006, adding the American, Whirlpool, GSW, and John Wood brands to their line of water heaters.

Product Lines

A.O. Smith was the first company to create glass-lined residential water tanks. In 2004, it began manufacturing Blue Diamond™ glass coating on its Conservationist® water heaters which provides more than two times the corrosion resistance of its competitors. Their line of residential water heaters includes the Voltex Hybrid electric heat pump water heater, which comes in 50- and 80-gallon models, has four operating modes and is Energy Star qualified, and the Cirrex solar water heater, which can reduce water heating utility costs by up to 70%.


A.O. Smith offers 10- and 6-year warranties on their water heaters. Details vary per model to include tank and parts warranties. Tankless water heaters have a limited 5-year parts warranty and a limited 15-year heat exchanger warranty.

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AO Smith Water Heater Reviews

Showing 1-5 of 66 reviews

"Do not buy this water heater"

1.0 rating
Very Unsatisfied

I purchased an ao Smith tankless water heater at Lowes – box said easy installation, Lowes personnel said you'll have no trouble installing. Brought it home – had to go back and purchase $300 of supplies just to install. Got electrician to install – heater won't come on. Called their technical support next day at 4:00. At 4:45 finally got to the correct department. They told me to remove the cover and I asked "how"? They couldn't tell me because they do not have a manual for the product they manufactured, however, the technician assured me she had been trained on this water heater. Started ABCs of trouble-shooting, hung up on me after a (got my phone number up front to call me back if we got disconnected – still waiting). Called back, asked for the manager – was told the managers don't have direct lines!!! Put on hold, finally hung up at 6:15. Got electrician back in – he was able to figure it out. So their inability to provide customer service cost my about $600. So far the unit is still working but the other reviews here do not leave me with much hope that I will get $1400 of use out of it – the cost of the unit, supplies, electrician, etc. I WILL NEVER PURCHASE ANOTHER ITEM FROM THIS COMPANY!!!!!!

R. Rogers

Pinnacle, NC

"Electric water heater"

1.0 rating
Very Unsatisfied

Installed electric 40 gal water heater less than 2 years old. Runs out of Hot within 3 to 4 min. Called company and they sent me 2 new elements and 2 New stats. Still does not work. They sent a service rep to check it out and he said it was ok. He turned the stats up to 145 deg. Turn on hot water and you had steam coming out. Just the type of man I would want working for me. They are saying that there is nothing wrong with it so they will not replace it. If you are looking to buy a New Hot Water Tank stay away from this company. They don't stand behind what they sell.

V. Oriole

"Expensive Warranty!"

1.0 rating
Very Unsatisfied

I bought an A.O. Smith water heater 2 years or less ago. The gas valve failed. It was warranted, but AOS said the valve would take up to 7 business days to arrive. So I had to pay $50.00 out of my own pocket to ship it so I'd have hot water. That's bs warranty coverage!

Bryan Huwar

Strattanville, PA

"Almost 40 years later!"

5.0 rating
Very Satisfied

Lived here for over 30 years – same tank in use that was installed when the house was built in 1978 – 6 kids, thousands of showers, dishes, and laundry – no maintenance or repairs needed and never once let me down. Love the 66 gallon tank – never ever a shortage of water.

Kay Workman

Tacoma WA

"AO Smith � Piece Of Garbage"

1.0 rating
Very Unsatisfied

Will never again purchase an ao Smith water heater. Mine has failed after 4 years. Water has been slowly leaking out of the bottom. I hired a plumber to look at the unit. When he took the panel off the bottom front, there was a significant amount of rust and corrosion, indicative of a leak in the tank. Am now having to purchase a new unit after 4 years. Rest assured, it will be another brand. Would never recommend ao Smith to anyone. In fact, quite the opposite… I'll share my experience with others whenever the opportunity arises.

P. O. Consumer

Tucson, AZ

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