ProMax® 80-Gallon Electric Water Heater

ProMax® 80-Gallon Electric Water Heater

Model ECT-80

ProMax Electric Tank Water Heater ECT-80 is rated 4.381 out of 5 by 21.
Rated 5 out of 5 by from easy to read instructions easy installation, should include hot and cold water connectors
Date published: 2014-12-12
Rated 5 out of 5 by from Quality product Replaced the exact same 6 year hot water heater after 10 years. Never failed, just felt it was time and changed on my terms versus an emergency change.
Date published: 2014-11-29
Rated 3 out of 5 by from Attractive cabinet and makes hot water. Replaced a Rheem that was 16 years old and cost $500 back then. Experienced "sticker shock" when pricing several other brands. Price was definitely a factor with A. O.Smith being the least expensive. I hope I purchased a quality water heater. Installed today so haven't had it long enough to offer an honest opinion on performance or longevity, although water was hot 1 hr after installation. That's a start. Disappointed I was not offered an extended warranty. Cannot honestly answer the questions below because of installation TODAY. Ask me in a year or so.
Date published: 2014-11-05
Rated 5 out of 5 by from perfect fit I don't have a full basement so I'm glad I found this heater and it work out well.
Date published: 2014-11-05
Rated 3 out of 5 by from installation just installed a day ago. Unable to rate or give a reasonable review
Date published: 2014-10-24
Rated 4 out of 5 by from last 80 gal. tank. no more available the 1st tank installed never heated up. plumber had to replace, due to incorrect wiring from manufacture. 2nd one has been been operating great.
Date published: 2014-10-21
Rated 4 out of 5 by from Well built unit Plumber picked this 80 gal. HWH out for me as a replacement to my Whirlpool that was only 9 years old. He recommended AO Smith over many other units out there for durability with well water. Impressed with brass drain rather then cheap plastic. Only con so far is that it was very expensive, $800.00 installed. Most expensive HWH I ever owned but needed it in an emergency.
Date published: 2014-09-18
Rated 5 out of 5 by from replacment the last water heater lasted 20 yrs. This one is new and looks great to soon to tell how well its going to work so far its great. Not sure if its going to effect my electric bill but it should be on the plus side considering the age of the one we replaced.
Date published: 2014-09-12

With a 80-gallon tank and 1 element delivering 4500 kilowatts, the ECT-80 delivers a first hour rating of 81 gallons at an Energy Factor of 0.86. The Coregard™ Aluminum Anode helps protect the tank from the corrosive effects of water, and is accompanied by a 6-year limited warranty.

Where to Buy

Where to Buy

Ashburn, VA

Location #1

Booze Plumbing And Heating

Vienna, VA

Se Habla Español

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Location #2


Manassas, VA

More Info >>
Location #3

Offutt Plumbing Inc.

Sterling, VA

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View All List My Company Here

Product Features & Options

DynaClean™ Diffuser Dip Tube

Thanks to the improved technology, the inlet tube features water jets that redirect incoming cold water into the tank, creating turbulence, which helps reduce lime build-up, therefore maintaining heater efficiency.

CoreGard™ Anode Rod

A. O. Smith’s anode rods have a stainless steel core that extends the life of the anode rod allowing superior tank protection far longer than standard anode rods.

Brass Drain Valve

Our brass drain valve is more durable and tamper-resistant than an ordinary plastic drain valve, which contributes to improved safety and reliability.

Permaglas® Glass Coating

Protects steel tank from corrosion and maximizes tank life.

How it Works

Cold water enters the water heater through an internal “dip tube” which forces the cold water to the bottom of the tank and pushes hot water out through the outlet connection. This arrangement provides the most hot water for a given tank size. There are two thermostats on a typical residential water heater. The thermostat at the bottom controls the lower heating element while the top thermostat controls the upper heating element. Usually, only one heating element is active at a time. Because the lower element sees the cold water first, the lower heating element does most of the work, while the upper heating element is used only when the entire tank is cold. Because water can corrode the steel tank, we glass line the inside of the tank and install an anode rod to help reduce corrosion. The temperature and pressure relief valve is a safety device designed to open if the internal temperature or pressure of the tank exceeds certain limits. Water heaters should be large enough to provide adequate hot water even when temperatures are cold and household demand is greatest.




limited warranty


energy factor

UL Listed means that the product met UL's safety requirements
CSA International Low Lead Content Certification in compliance with U.S. and Canadian safety standards on gas components
AHRI Air-Conditioning, Heating and Refrigeration Institute
The Blue Diamond formula is enriched with a high level of zircon, producing a coating that is harder and more water-resistant than any other in the industry

Product Specifications

Tech Specs
Gallon Capacity: 80
Recovery Gallons: 21
First Hour Rating: 81
Energy Factor: 0.86
Thermal Efficiency: 98%
Upper Element Wattage: 4500
Lower Element Wattage: 4500
Max Wattage: 4500
Limited Tank Warranty: 6 Years
Limited Parts Warranty: 6 Years
Anode: Coregard™ Aluminum Anode
Foam Insulation: 2"
Self Cleaning: Yes
T&P Relief Valve: Yes
Water Connection Location: Top
Water Connection Size: 3/4"
Dimensions & Venting
Type: Tall
Height: 60 1/2"
Diameter: 22 1/2"
Width: 22 1/2"
Depth: 22 1/2"
Shipping Weight: 208lbs/94kg


Rebate and incentive programs provide cash-back to consumers for the purchase of appliances that meet certain energy efficiency standards. Often, these standards are tied to the ENERGY STAR® program.

Cash for Appliances is designed to encourage the purchase of energy efficient appliances. Consumers who purchase ENERGY STAR® or CEE qualified appliances can receive cash rebates. Most states are offering rebates in the $50 to $250 range.


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Need More Hot Water?

There's no reason to run out of hot water. If you're not sure that the ECT-80 provides enough hot water for your needs, consider these:

ProMax® 119-Gallon Electric Water Heater

  • 6 Year Limited Warranty
  • 112 First Hour Rating

ProMax® 40-Gallon Electric Water Heater

  • 6 Year Limited Warranty
  • 52 First Hour Rating

ProMax® 50-Gallon Electric Water Heater

  • 6 Year Limited Warranty
  • 60 First Hour Rating

ProMax® 55-Gallon Electric Water Heater

  • 6 Year Limited Warranty
  • 67 First Hour Rating