ProMax® 40-Gallon Propane Water Heater

ProMax® 40-Gallon Propane Water Heater

Model GCVL-40 (LP)

ProMax Propane Tank Water Heater GCVL-40 (LP) is rated 4.7297 out of 5 by 74.
Rated 4 out of 5 by from Wanted a 10 year model but not given choice Purchased because my A.O. Conservationist failed 7 years into a ten year warrantee. Too early to tell if I like this. Pretty expensive at about $900 for a warrantee life of 6 years.
Date published: 2014-11-18
Rated 5 out of 5 by from it was a breeze to replace brand "x" 10 NOV 14 Just purchased the new AO Smith water heaterNot all projects go as smooth as my new AO Smith water heater installation. Within one hour we removed the old heater and had the new AO Smith up and running.We do like the new to us user friendly controller.
Date published: 2014-11-11
Rated 4 out of 5 by from New HOH heater 1 month since intallation, works very well.Happy with the unit, will see how it does over time.
Date published: 2014-11-06
Rated 5 out of 5 by from Correct size was installed This is the brand the contractor recommended, Work great,
Date published: 2014-11-06
Rated 5 out of 5 by from Right heater with great features This is a very old house and it never really had the right size water heater. So when it began to need replacing we relied on a contractor we good experience with in the past. Pat got right on the job and we now have the right water heater for our house. The vacation mode and status light features are great and with a lot of visitors coming our way this Christmas, dependable hot water is essential.
Date published: 2014-11-05
Date published: 2014-11-02
Rated 5 out of 5 by from So Far, It's Great!! Water heater is really quiet, the water is super hot, and I love the added features (gas odorant, and easy to use thermostat)!
Date published: 2014-10-18
Rated 5 out of 5 by from Works fine! Has given me hot water on demand just like it should!
Date published: 2014-10-12

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 propane burner, the GCVL-40 (LP) standard vent delivers a first hour rating of 66 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

Ashburn, VA

Location #1

Booze Plumbing And Heating

Vienna, VA

Se Habla Español

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Location #2


Manassas, VA

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Location #3

Offutt Plumbing Inc.

Sterling, VA

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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 exlusive aluminum anode has a stainless steel core, which protects the tank against corrosion longer than ordinary mild steel anodes.

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: Propane
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: 66
Dimensions & Venting
Type: Short
Height: 47 3/4"
Height w/Draft Hood: 47 3/4"
Diameter: 20"
Width: 20"
Depth: 20"
Shipping Weight: 135lbs/61kg
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 GCVL-40 (LP) 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