ProMax® 40-Gallon Gas Water Heater

ProMax® 40-Gallon Gas Water Heater

Model GCV-40

ProMax Gas Tank Water Heater GCV-40 is rated 4.6319 out of 5 by 163.
Rated 4 out of 5 by from great water heater My company deals with ao smith so why not get one myself
Date published: 2014-11-24
Rated 5 out of 5 by from Easy Installation Only have had this water heater for a week. operation is great, nice water temp on only the hot setting.
Date published: 2014-11-22
Rated 5 out of 5 by from works well I am very happy with the hot water heater.It has modern features and easy to perform service on it
Date published: 2014-11-20
Rated 5 out of 5 by from Just Installed Just installed yesterday. Great looking product. Look forward to great service.
Date published: 2014-11-19
Rated 2 out of 5 by from 3rd one in 7 years I wish I could recommend this product, but it is the 3rd one I have had in 7 years. This unit was replaced, but it cost me $500 labor each time to replace and now I only have 2 years left on the warranty.
Date published: 2014-11-18
Rated 5 out of 5 by from made in usa quality excellent return for the quality and most important made in america replacement parts and service will not be an issue... bought from a local plumbing store (independent) . researched all brands and factors and very happy with the purchase. Replaced another ao smith that lasted 16 years!
Date published: 2014-11-18
Rated 5 out of 5 by from Heater works well My current water heater is a replacement under warranty of my original AO Smith 40 gallon (Natural Gas) water heater bought three years ago. When the heater was working, it worked very well. The efficiency was good as I saw the heater turn on for a very short time to bring the water up to set tempera tire. The finish looked good, all-in-all a good machine.I was disappointed that my original heater developed a leak so soon. My plumber informed me that it does not happen very often, my case was a rare exception. I am willing to live with that. The company replaced the heater with no problem or hassle,however, my loss was from the plumber's fee to reinstall it. I hope you have betterluck. I was told that the warranty covers replacement of the machine and labor for installation is my expense.
Date published: 2014-11-10
Rated 5 out of 5 by from So Far, tops I purchased this about a month ago through my service plan with PSE&G; great program. I trust them, knowing they would have excellent products. Within 24 hours, after I called, it was installed. I wanted a larger, energy efficient unit, but my space could only hold this size. So far it's been great. Quick reheat time; and hot.
Date published: 2014-11-10

The Promax® 300/301 Series gas water heater is designed to deliver an economical performance that can lower your energy bills and also provide long-lasting value.

Featuring a 40-gallon tank and a 40,000 BTU gas burner, the GCV-40 standard vent delivers a first hour rating of 70 gallons and a recovery rate of 41 gallons per hour. With an 0.59 Energy Factor, this water heater is not ENERGY STAR® qualified. It carries a 6-year limited warranty, and meets Low NOx emission requirements.

Where to Buy

Where to Buy

Woodbridge, NJ 07095

Location #1


Edison, NJ

Se Habla Español

More Info >>
Location #2

William J. Guarini Plumbing

Jersey City, NJ

More Info >>
Location #3

Authorized Heating

Brooklyn, NY

More Info >>
View All List My Company Here

Product Features & Options

Self-Powered Electronic Gas Valve

Uses a thermopile to generate the power needed to operate the electronic gas control without requiring an external power source.


The electronic gas control incorporates an LED status indicator that monitors system operation and service diagnostics.

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.

How it Works

Gas water heaters heat water by burning either natural gas or LP (propane). Gas water heaters need a source of air and also need to be vented properly. 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. Most gas water heaters use a pilot light. The pilot light on some models also generates the power needed to operate an electronic gas valve. When cold water enters the tank, the temperature sensor on the gas control tells the main gas valve to open. Gas flows to the burner where it is lit by the pilot light. The air needed by the burner is supplied by the room where the water heater is installed. The exhaust gases are vented to the outside. When the proper temperature is reached, the main gas valve shuts off. 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

CSA International Low Lead Content Certification in compliance with U.S. and Canadian safety standards on gas components
ASME American Society of Mechanical Engineers
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: 40
Recovery Gallons: 41
Maximum BTUs: 40,000
Power Source: Natural Gas
Energy Factor: 0.59
Limited Tank Warranty: 6 Years
Limited Parts Warranty: 6 Years
Anode: Coregard™ Aluminum Anode
T&P Relief Valve: Yes
Ignition Type: Electronic
Water Connection Location: Top
Water Connection Size: 3/4"
Emissions: Low NOx
FVIR Certified: Yes
First Hour Rating: 70
Dimensions & Venting
Type: Tall
Height: 58 1/4"
Height w/Draft Hood: 61 3/4"
Diameter: 18"
Width: 18"
Depth: 18"
Shipping Weight: 138lbs/63kg
Vent Type: Standard Vent


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 GCV-40 provides enough hot water for your needs, consider these:


Effex® High Efficiency 40-Gallon Gas Water Heater

  • 6 Year Limited Warranty
  • 40,000 BTU

Effex® High Efficiency 50-Gallon Gas Water Heater

  • 6 Year Limited Warranty
  • 40,000 BTU

Vertex™ 100 Power Direct Vent 50-Gallon Gas Water Heater

  • 6 Year Limited Warranty
  • 100,000 BTU

Vertex™ Power Vent 50-Gallon Gas Water Heater

  • 6 Year Limited Warranty
  • 76,000 BTU