6 Best 40 Gallon Gas Water Heater for Super Heating

Are you looking for the best 40 gallon gas water heater? In this post, we will break down the top 6 best 40 gallon gas water heaters on the market. And all are available on Amazon, make sure you check those out to see which one is in your budget range.

40 gallon is one of the popular gas water heater brands in the market. And of course, they have the best heaters I have ever seen. But they have so many models that confuse people to make buying decisions.

If you are also confused about which 40 gallon gas water heater you should buy, so I am here to help you. My goal is to create a proper shopping guide so that you can make the best decision.

I have tested on best 40 gallon water heaters based on features, price, and user feedback That’s why this is not only an informative post because I write my own reviews in this post based on my experience.

Are You In Hurry? Then Check Out Below!

I have created this section for those who do not have much time. Due to this section, you don’t have to read the entire post. I can say this is the summary of this complete post where you can check or buy the 40 gallon gas water heaters in a single click.

Before proceeding, I suggest you read buying guides for 40 gallon gas water heaters that will help you make the right decision to make a purchase.

Buying Guide For The Best 40 Gallon Gas Water Heaters

There are some concise buying guides for the best 40 gallon gas water heaters:

  • Capacity: Determine your hot water needs based on the number of people in your household.
  • Energy Efficiency: Look for a high Energy Factor (EF) rating for cost-effective operation.
  • Fuel Type: Choose between natural gas and propane based on your gas supply.
  • Venting System: Select the appropriate venting system for your home layout.
  • Energy Efficiency Features: Consider insulation and high-efficiency burners for savings.
  • Recovery Rate: Ensure the unit can reheat water quickly during peak usage.
  • Tank Material: Stainless steel or glass-lined tanks offer durability.
  • Safety Features: Check for pressure relief and temperature valves.
  • Budget: Set a reasonable budget that aligns with your preferences and needs.
  • Customer Reviews: Read feedback to gauge real-world performance.
  • Installation: Budget for professional installation to ensure safety.
  • Maintenance: Consider maintenance requirements, like sediment flushing.
  • Local Regulations: Verify compliance with local building codes and regulations.

These buying guides really help you buy the best 40 gallon gas water heater according to your budget and needs.

Top 6 Best 40 Gallon Gas Water Heaters

Finally, we reached the main topic. 😀 Here are the top 6 best 40 gallon gas water heaters given below:

1. GCR-40 ProMax Plus High Efficiency Gas Water Heater By A.O. Smith Store

AO Smith is one of our favorite brands of water heating systems. They constantly strive to include small, user-friendly details that will give you peace of mind that your water heater will be there for you when you need it.

This 40 gallon gas water heater is a tank so strong and durable that I have no worries when it comes to durability with this system. While the tank is very heavy, once it is in place, you will not have to worry about it anymore.

This natural gas water heater is great for any home but would excel in an area that has a water supply that is on the harder side. Since this model is a direct venting model, it draws clean air from the outside environment to help ventilate gas. The glass-lined interior helps combat corrosion, and the DynaClean diffuser fights off limescale buildup and sediment issues.

GCR-40 also uses a DynaClean diffuser-dipped tube to help prevent lines and sediment buildup inside the tank. The Blue Diamond glass coating provides resistance to corrosion, making this model the most durable one.


  • Durable construction for longevity.
  • Efficient natural gas usage for cost savings.
  • Glass-lined tank resists corrosion.
  • Direct venting ensures better air quality.
  • DynaClean diffuser minimizes sediment buildup.


  • Heavy during installation.
  • Warranty duration is shorter than some competitors.
  • May not fit well in smaller spaces.

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2. Bradford RG 240 T6N Natural Gas Water Heater By Bradford Store

The water heater that heats our list of Bradford White water heater reviews is the RG 240 T6N water heater. It comes with a large-sized water tank that can store 40 gallons of water for delivering hot water instantly.

The tank is insulated with non-CFC foam, which prevents standby heat failure. In addition to that, the combination of a magnesium anode rod and the Vitro-Dlas lining provides protection against corrosion. This is the reason that increases the longevity of this 40 gallon gas water heater.

This natural gas water heater has featured the Icon system as well as atmospherically vented. The Icon system provides great temperature control plus diagnostics, while atmospherically vented automatically regulates the airflow.

In addition, the hydrogen performance system enhances its efficiency and performance simultaneously.


  • Large 40-gallon tank for ample hot water.
  • Energy-efficient with a high Energy Factor (EF) rating.
  • The magnesium anode rod and Vitro-Dlas lining prevent corrosion.
  • Icon system for precise temperature control.
  • Atmospherically vented for safety.
  • Hydrogen performance system enhances efficiency.


  • May not be suitable for homes with limited venting options.
  • Installation and maintenance may require professional assistance.
  • The initial cost could be higher compared to standard models.

3. EZTR40 Natural Gas 40-Gallon Tank Replacement Tankless Water Heater, 6.6 GPM By Noritz Store

Noritz is one of the leading tankless water heater manufacturers, and many firsthand users have recommended the product for its supportive features. The entire package comes with all the necessary items you need to have for a tankless water heater.

The vent pipe is made from polypropylene and is flexible. Condensing technology is smart and takes less time to heat the water. Moreover, you can quickly fix the temperature of the water using the isolation valve kit.

Most of the users of the product were happy with the easy installation of the heater. You can install the heater on a gas line without causing any damage to the line or surroundings. It takes less time, and the gas consumption is also low, saving you money.

This high-efficiency water heater is an ideal replacement for a 40-gallon tank-type heater, so if you’re planning to update your water heater to achieve better efficiency, you might want to check this out. The bundle is a real deal because it doesn’t require much plumbing modification.


  • Comes with a complete package for tankless water heating.
  • Polypropylene vent pipe for flexibility.
  • Condensing technology for efficient water heating.
  • Easy installation, suitable for gas line updates.
  • Low gas consumption for cost savings.


  • May not be suitable for larger households with high hot water demands.
  • The initial cost may be higher compared to standard tank water heaters.
  • Requires professional installation for safety and proper setup.

4. Rheem PROG40-38N RH59 Professional Classic Tall Residential 38K BTU Atmospheric Natural Gas Water Heater, 40-Gallon By Rheem Store

The ProLine 40 gallon gas water heater is a popular choice for many homeowners, especially those who have more complicated venting pipes. Often condo buildings and apartments will have water heaters that are placed in precarious spots, making it very difficult for gas to be expelled properly.

To combat this, the ProLine XE features a powered exhaust fan that pushes gas out with strong force rather than the atmospheric style we have seen. This exhaust fan was quiet and kicked in immediately, which we were impressed by. The tank itself features a few features that help combat water hardness and sediment buildup.

These are great to have because you will have overall better water, and they will elongate the gas water heater. All the components are made from brass, which is the best choice for durability and ease of use. Plastic valves can get stuck easily, and with this brass valve, it features a quarter-inch flathead screw that allows you to tighten and loosen the valve easily.

With this, you could accidentally bump the valve, and it will not open, causing unnecessary leaks. The warranty is six years, which is lower than many other 40 gallon gas water heaters.


  • Powered exhaust fan for improved venting.
  • Brass components for durability and ease of maintenance.
  • Special features combat water hardness and sediment.
  • High-quality construction and materials.
  • 40-gallon capacity suitable for most households.


  • Six-year warranty may be shorter than competitors.
  • The initial cost may be relatively high.
  • Professional installation is recommended for proper venting.

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5. Excel Pro Tankless Gas Water Heater NATURAL GAS 6.6 GPM Whole House And For Hydronic Heating By Excel Store

If you are on the lookout for a tankless water heater that will save you energy and water while not limiting the capacity, then you might want to consider this model. With a 1.6 GPM water flow and heating capacity, it will be more than enough for you to have that hot shower that you have been dreaming of.

The Excel Pro tankless gas water heater is certainly not a new face on the block, but even so, it continues to provide a reliable standard of production through its combination of a 6.6 GPM flow rate and a peak heating capacity of 140,000 BTU.

This model takes special advantage of its core capabilities through a specialized heat modulation process that adjusts heat production to respond to changes in the flow rate. This model’s heating capabilities are primarily facilitated by a pure copper heat exchanger, which is particularly durable and is able to produce an 84-plus heating efficiency when in use.

Though its digital display only reads in Celsius, knowledgeable mobile homeowners can install this tankless heater and know that it has been tested to prevent accidental property damage.


  • High water flow rate of 1.6 GPM for ample hot water.
  • Efficient heating capacity with 140,000 BTU.
  • Digital display for easy monitoring.
  • Durable pure copper heat exchanger.
  • Tested for safety and property damage prevention.


  • The digital display may only read in Celsius.
  • Installation may require professional expertise.
  • May not be suitable for all homes due to gas requirements.

6. Westinghouse WER040C2X055N06 Water Heater with Durable 316L Stainless Steel Tank, 40 gallon gas water heater, 5500W By Westinghouse Store

The electric water heater comes in two sizes and has different warranties. This water heater has a 40 gallon tank size. It is an environment-friendly water heater that fulfills the requirements set by the NAECA (National Appliance Energy Conservation Act). The stainless steel tank is laser-welded like all Westinghouse water heaters and does not require an anode for rust protection.

You can get hot water pretty quickly with this product. It moves the cold water to the bottom near the second heating element and keeps the hot and cold water from mixing. It also includes a high-temperature limit you can adjust yourself. 40 gallon gas water heaters are perfect for normal homes.

This unit uses electricity to heat water and removes extra fuel bills and the need to buy and install venting pipes. Its use and installation are very simple, as all Westinghouse products are made to save money on fuel and power.

You get a decent first-hour rating and UEF, with little standby loss and dual heating elements making heating even faster so you don’t have to wait too long anymore.


  • Environmentally friendly with NAECA.
  • Stainless steel tank for corrosion resistance.
  • Quick hot water delivery.
  • Adjustable high-temperature limit.
  • Dual heating elements for efficient heating.


  • Electric operation, which may lead to higher utility bills.
  • Limited size options.
  • May require a dedicated electrical circuit for installation.

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FAQ: Best 40 Gallon Gas Water Heaters

How long should a 40 gallon gas water heater last?

With proper maintenance, A 40 gallon gas water heater typically lasts 8 to 12 years. Durability may extend to 15 years for well-constructed models.

Is a 40-gallon gas water heater big enough?

A 40 gallon gas water heater is generally sufficient for small to medium-sized households with 2 to 4 people, but larger families may require a larger capacity.

How much electricity does a 40 gallon water heater use?

An electric 40 gallon gas water heater typically consumes about 4,500 to 5,500 watts per hour, depending on its energy efficiency and usage patterns.

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