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The Best 40 Gallon Gas Water Heaters for 2023

Writen by Ronald Brown

Fact checked by Natalie Bridges

There is no better feeling in the world than relaxing with a shower after a long day at work. But in the winter or cold weather, it can be frustrating to find no hot water available when you need it.

Don’t worry because you can rely on the best 40 gallon gas water heater, which is just the right size for many families. It also has the durability and ease of maintenance that thousands of households appreciate.

best 40 gallon gas water heater

This device is reliable and requires less maintenance vs. other types of water heaters. However, it’s not as easy as it might seem to find the one that suits your family. Like any other home appliance, water heaters are available in different configurations.

Choosing a 40-gallon gas water heater is easy if you consider crucial buying factors. Thankfully, we have three essential parameters to help you decide.

  • First-hour Rating: This factor is crucial for all storage tank water heaters, whether gas or electric. It describes how fast the device can raise the water temperature to a predefined level, allowing families to enjoy hot water within an hour of operating the heater. Families will benefit more from a gas water heater with a higher FHR value (i.e., 70 gallons vs. 50 gallons).
  • Recovery Rate: Most 40-gallon gas water heaters recover about 30 gallons of hot water hourly, giving users an ample hot water supply. Although 30 GPH is enough for most families, one might choose a product with a higher recovery rating (i.e., 50 gallons).
  • Warranty: Product guarantees reflect their quality construction and durability. After all, no company will want to replace a defective or dysfunctional unit. Hence, warranties underscore a brand’s belief in its gas water heater. As a rule, pick a 40-gallon gas water heater with a longer warranty (i.e., 12 years vs. 6 years) for peace of mind.

Worry not now, as help is here! Read the following for reviews of the top picks, each with pros and cons, and a buying guide on the features/factors to consider comparing your options. If you’re ready, let’s begin.

Top-Rated Products

Best Overall

Eccotemp i12-NG


Premium Choice

Rinnai RU180iN


Best Value

EZ Ultra HE Water Heater


Table of Contents

Top-Tier 40 Gallon Gas Water Heater Reviews

1. Eccotemp i12-NG Water Heater

Even the smallest 40-gallon gas water heater requires at least a foot of clearance on all sides. With the Eccotemp i12-NG, space is never an issue because it only measures 14 inches wide and 26 inches tall.

I love this gas-powered tankless water heater’s uber-stylish design in an elegant all-black mirror finish. Neighbors will never know we have a water heater mounted on our walls, thinking instead it is an advanced control unit for smart home technology.

The white LED readouts offer a remarkable contrast to the black tempered glass surface. Water flow and temperature information are on display, offering homeowners a quick view of the product’s performance. The screen is touch-sensitive, making this water heater a joy to operate.

Despite not being a well-known brand, this gas water heater rating is impressive. I am sure its beautiful design and intuitive controls are just a few of the many things homeowners love about this product.

Although I could not see an Energy Star certification, I am sure this gas water heater is energy efficient. It only draws 1.07 amps on a 120-volt outlet for a wattage rating of 128.4.

Using this water heater for three hours daily will only consume 140.6 kWh annually. Marketing information also shows families using this water heater will only spend $206 yearly on electricity.

Installation is more straightforward than conventional water heaters, although it still requires venting. Three gallons of water can pass through this water heater every minute, but it requires only 77 ounces of water flow to activate the heating mechanism.

I wish this gas water heater were not only for indoor use because I want it to supply on-demand hot water to our outdoor shower unit.

This gas-powered water heater is an excellent alternative to a conventional 40-gallon water heater. It is space-efficient, performs well, and looks stunning.

What We Like
  • 0-GPM rating with low-flow activation
  • 07-amp, 120-volt unit for better energy savings
  • User-friendly interface with LED readouts and high touch sensitivity
  • Convenient installation
  • Compact design (14 x 26 inch size) with stylish tempered glass
What We Don’t Like
  • Indoor use only

2. Rinnai RU180iN Water Heater

The RU180iN Sensei SE+ tankless water heater is your solution if you’re looking for an energy-efficient heating system that works.

This particular model is rated with at least 15,000 BTU and at most 180,000 BTU and has a capacity of 10 gallons per minute. If you’re in a household with up to five members, you might want to consider it as one of your options.

I recommend this Rinnai water heater for its innovative ThermaCirc360 technology. It works by recirculating hot water through the pipes whenever you need it for a constant supply.

Furthermore, it does not waste water, unlike your traditional tank water heater. Using this unit, you can save up to 8,700 bottles of water per person annually.

Besides, you can save more room than with a tank water heater. This one has a compact design and small size, letting you install it in narrow spaces like a closet, crawl space, or attic.

By choosing it, you can save foot space up to 16 square feet. Thanks to its small size resembling a suitcase. You can also take advantage of substantial utility savings in this device. It has a compact design, translating to fewer CO2 emissions, water conservation, and less energy consumption.

However, first-time users might need a little time to become familiar with the use of this heater. Overall, it’s an excellent choice for households with up to five members. It can also conserve valuable space and ensure a hot water supply on demand.

What We Like
  • 10 gallons per minute for a small household
  • Ensures hot water on-demand for your family
  • Energy-efficient natural gas water heater
  • Compact to save valuable space
  • Designed with ThermaCirc360 technology
What We Don’t Like
  • Can be tricky in the initial uses

3. EZ Tankless Water Heater

The EZ Ultra HE is Propane or Natural Gas (LPG) condensing water heater that provides all the advantages that loyal EZ consumers expect.

The Ultra HE is the brand’s first condensing heat exchanger that permits the arrest and draining of the acidic condensation that prevents vertical venting. You can’t go wrong with this tankless water heater because the system can reach an efficiency level of 92% and even more by using exhaust gases to preheat the inlet water.

With the low-temperature exhaust gases courtesy of the condensing heat exchanger, the unit can be vented with the Solid Core Schedule 40 PVC/CPVC pipe, either vertically or horizontally.

Designed for the typical American household, this affordable, efficient, and easy to use system can remove a big bulk of your home’s standby energy loss, which would mean more significant savings on your money and energy use.

Emphasis on easy to use because it is designed for 100% automatic operation, which means you need to be waiting for it. Just turn on your water spigot, and hot water will be there in only a few minutes. Once the tap is off, the heater will also automatically switch off. Should the water supply be sporadic, your gas valve will shut off by itself.

With its full key touch water temperature settings, understanding which button to use is easy. Its user-friendly key controls can also be pre-set to your preferred water temperature, making it more convenient.

Once you have set it to your preferred temperature, it does the temperature modulation automatically. The system will modulate the fan, gas, and water flow, ensuring that the temperature is consistent and constant. Expect it to produce 3.4 gallons of water in 60 seconds at a 45F rise.

As a bonus, this system is simple and aesthetically beautiful, making it easy to install. Even if it is within view of your living spaces, it is not imposing or unpleasant to the eyes.

The drawback of this system will be its complicated installation process. This is the best 40 gallon gas water heater that you can ever incorporate in your home. It is a good value for your money, and you get hot water in an instant.
What We Like
  • It is a fully electronic control system with an advanced computer chip.
  • High thermal efficiency and excellent combustion performance
  • 4 gallons of hot water in 60 seconds
  • A full keypad control system that is easy to understand and use
  • Energy-efficient so it won’t blow your energy bill
What We Don’t Like
  • Installation may be tricky and takes time

4. Takagi T-H3S-DV-P Water Heater

The TAKAGI must be on your list if you’re looking for a highly-efficient propane water heater that can produce eight gallons of hot water per minute. That’s great news for larger households with a higher volume of water requirements.

This unit can supply your home with endless hot water on demand. With this, you and your loved ones will have peace of mind that you won’t run out of hot water whenever you need it.

Besides, I like that this unit is space-saving, not requiring a large space for installation. You can have it installed even if you’re in an apartment, condominium, or tiny home.

This model has automatic safety features that make its operation more straightforward and convenient for busy households. There is also no need to worry about a pilot light, which is common among older models.

You can count on this one about health and safety because it is certified to produce low nitrogen oxide emissions. It meets Rule 1146.2 (2012 SCAQMD).

Additionally, it has a large capacity and rating of 180,000 BTU which translates to a larger capacity to produce hot water for the entire household, even those with three bathrooms (warm climates) and two bathrooms (cold climates).

However, if you’re looking for a more budget-friendly option, consider its high price tag before purchasing. There were also reports about the lack of instruction that comes with it.

Overall, it’s an efficient water heater for at least one bathroom and offers peace of mind for its durability.

What We Like
  • 180 000 BTU rating to supply hot water to up to three bathrooms
  • Highly-efficient and innovative with computerized safety features
  • Lets your family enjoy hot water on demand
  • Certified to have low NOX emissions
  • Space-saving and compact design
What We Don’t Like
  • Costs more than others
  • No instructions included

5. Camplux Natural Gas Water Heater

Considering a 40 gallon water heater price, you’d be surprised with the CAMPLUX indoor tankless heater. Its price is not as steep as other models, yet it’s quality and innovative.

I like that this model is compact and sleek. The tankless water heater is suitable for small cabins and apartments because it does not occupy a large space.

This model is with a black glassy panel, which looks modern, matching any home design and decoration. Its front panel is also easy to understand, touchscreen controls and a digital display. You will not have a hard time understanding the data it is showing you at all.

The Camplux tankless water heater also has a high capacity of 3.18 gallons per minute, suiting even a large household. You can count on it for an on-demand hot water supply suitable for up to three persons who want a comfortable hot shower, especially in the cold weather.

I also recommend this indoor tankless heater because it has different protection features, ensuring your peace of mind. Some of these include anti-freeze protection and overheating protection.

Plus, it is designed with automatic temperature controls, including an energy-saving mode. And if you have kids at home, you can also count on its child-lock technology that keeps your children out of harm’s way.

However, you might seek professional plumbing help if it is your first time installing a device like it to avoid any trouble or hassle later. Overall, I like this Camplux 12L capacity model for its easy operation and multiple protection features.
What We Like
  • Compact, sleek, and modern design fits any decoration.
  • Easy to understand and read display and useful touchscreen controls
  • High-capacity range up to 3.18 gallons per minute
  • Multiple protection features for added safety
  • Can be used for small spaces, including tiny homes and remote apartments
What We Don’t Like
  • Installation can be tricky for first-timers

6. Bradford White BWC RE340T6-1NCWW

One of the trusted brands that provide the top-tier water heater for your home is the Bradford White BWC RE34OT6-1NCWW model. This 4,500-watt unit has 40 gallons and is one of the most massive water heaters from Bradford.

This 40 gallon electric water heater boasts of its durability feature by using a protective magnesium anode rod. This same rod also protects it against corrosion. What’s more, this particular model meets all the current ASHRAE Standard 90.1 of the Department of Energy.

Made in the US, this water heater also has 2 inches of non-CFC foam insulation covering all the sides, including the tank’s top. This padding can help in maintaining heat and lessening energy consumption. That means you will have lower energy bills even if you have a water heater installed in your house.

You won’t run out of hot water because this has a First Hour Delivery of 55 gallons. The Recovery Rise is 21 minutes for this heater, meaning once the cold water enters your hot water tank, it will take 21 minutes for the water to rise to a temperature of 90 degrees.

Furthermore, it boasts a HydroJet Total Performance System, primarily a cold-water inlet tube engineered to lower the sediment buildup within the system. It also ensures that stored water is appropriately mixed with the incoming water.

With this technology, heaters don’t need to work as hard or as often because they can maintain a stable supply of hot water at a pre-set temperature.

Additionally, this water heater also comes with the world’s top-rated enamel tank lining, the Vitraglass, which lessens and almost zeroes out any failures on the system.

A disadvantage of an otherwise perfect system is the system is massive, and you might need a professional to get the installation done.

Bradford is always the right choice when it comes to water heaters. Their reputation has been established because of years of quality systems and reliable products worth your investment.

What We Like
  • Utilizes the Hydrojet Total Performance System
  • Equipped with 2″ Non-CFC Foam Insulation
  • Lined with the best enamel tank lining, the Vitraglass
  • Boasts a first hour delivery of 55 gallons
  • Uses a protective magnesium anode rod for durability
What We Don’t Like
  • The water heater is more massive than others.

7. CAMPLUX CM264-NG Water Heater

Finally, we have the CM264-NG Water Heater, consistently top-rated in the category for its useful features, including innovativeness and quality. It comes from a reputable brand that has made outdoor life and adventures more fun and exciting!

By choosing this product, you can be confident you’re dealing with a brand that values its offerings’ performance. For one, it is easy to use for on-demand or whole-home use. It is also ideal for small homes, apartments, and cabins because of its small size.

Besides, the CAMPLUX CM264-NG has a modern design that makes it perfect, no matter your home decoration or theme. The modern design does not overwhelm any existing design. It also has an easy-to-read display that adds to its ease of use. You will not have to worry about anything, even if it’s your first time using a device like it.

This model comes with additional safety elements like airflow pressure switch protection and flame-out cut-off protection. You can use the Camplux CM264 with a natural gas tank with a capacity between 20 and 100 pounds.

But if you’re looking for a high capacity water heater, it might not be the most suitable option. Overall, this unit is sufficient for a small household designed with innovative features for superior performance.

It can also offer quick and easy installation and different protection features, such as against overheating. If these features appeal to you, check out the Camplux 2.64 GPM tankless gas water heater now.

What We Like
  • Ease of installation and use for whole home or small home
  • Modern design to suit any existing home decoration
  • Multiple protection features, including anti-freezing and overheating protection
  • Innovative combustion technology saves power.
  • Easy to read LCD for the information you need
What We Don’t Like
  • Might not be suitable for large households

Outdated Products

A.O. Smith GCR-40 ProMax Plus Gas Water Heater (Outdated)

Get nothing but top-quality from A.O. Smith Corporation, one of the biggest water heating products suppliers. This US Company is known for its residential and industry-grade heaters.

From 1874 until now, you can be guaranteed that their products are versatile and efficient. The GCR-40 ProMax Plus is no exception! As it’s powered with a 40,000 BU gas burner paired with a 40-gallon tank, you can enjoy 80 gallons of hot water in just 60 minutes. After this, this water heater recovers at 42 gallons every hour.

The AO Smith 40 gallon gas water heater has met all the requirements that the National Appliance Energy Conservation Act set, and the Green Choice installed in the system is known to reduce NOx emissions by up to 33%.

This system’s make and material feature Blue Diamond glass coating, and Dynaclean ensures and upturn its overall durability and long life. The stainless-steel anode rod meanwhile guarantees to protect your system from corrosion, limescale buildup, and sediment formation. It promotes maximized hot water output.

Designed to provide high performance, the A.O. Smith GCR-40 ProMax Plus High-Efficiency Gas Water Heater comes with a self-powered electric gas valve that uses a thermopile. As a result, the power needed to operate the electronic gas can be generated.

The whole process does not require any external power, so it can help you lower your electricity bills.

You won’t need to wait long for hot water, especially during the winter season, when you have this GCR-40 ProMax plus. That is because its integrated microprocessor offers enhanced operating procedures, tighter differentials for accurate sensing, and a quicker healing response time.

With all its premium perks, the only setback for this gas water heater is its burner plate is rather delicate, so it needs to be handled with care.

Overall, the A.O. Smith GCR-40 ProMax is the ultimate choice for a water heater. It exceeds expectations and delivers hot water as you need it making it the to-rated 40 gallon hot water heater on the market.

What We Like
  • Meet the standards of the National Appliance Energy Conservation Act
  • Able to reduce NOx emissions of up to 33%
  • Large capacity of 40,000 BU gas burner paired with a 40-gallon tank
  • Enjoy 80 gallons of hot water in just 60 minutes.
  • Excellent Blue Diamond glass coating and Dynaclean
  • Cost-efficient as it does not need any external power
What We Don’t Like
  • The burner plate is delicate.

Rheem PROG40-40N RH62 Water Heater (Outdated)

The Rheem 40 gallon gas water heater is majorly appealing to households who want to cut down on their electric consumption but still need hot water in their homes. Gas heaters typically have lower operating costs compared to electric heaters.

This Rheem water heater has a UEF efficiency of.58 to.66. This means that it can produce more hot water with lesser gas usage, making it more environmentally friendly. Its heaters have low nitrogen oxide emissions, which is better, mostly if used at home.

With a recovery rate of 30.3 to 40.4 GPH, this 40 gallon natural gas water heater is the second largest in the brand’s range of water heaters and should adequately meet your hot water requirements. It can steadily produce 51 to 87 gallons of water in the first hour.

One of the top-rated features of this model is it is designed to last for a long time. It has a solid build, and it uses a registered Rheem exclusive R-Tech premium grade anode rod. This is intended to ensure that the tank can last a long time.

On top of those, the guardian system and sensor add a layer of protection to the unit and the user. It is a unique air/fuel turn-off system that disables the whole system should it detect any flammable vapor buildup. The use of gas strikes a worry because of the dangers that come with it, but this system makes it safer for everyone.

You also don’t need to worry about any maintenance for the system because there are no filters involved in the process, so it means that there is nothing for you to clean.

The only setback of using the Rheem system is the tank is rather imposing. You will need to allocate a specific space for it because it is bulky and tall.

This water heater from Rheem is an excellent investment. It delivers consistently and saving money while enjoying your hot water is such a great deal.

What We Like
  • Comes with a dedicated defensive control system
  • Operates at a lesser cost compared to other water heaters
  • An eco-friendly burner with low discharges
  • Comes with a temperature and pressure relief valve
  • Zero maintenance because no filter is used
What We Don’t Like
  • The tank is massive and tall.

Bradford Water Heater RG240T6N (Outdated)

If you want reliable hot water throughout your home, you can’t go wrong with Bradford. This 40-gallon natural gas water heater comes with an integrated Defender Safety System and the other upgrades expected from a Bradford.

The RG240T6N utilizes an Atmospheric Vent and is proud to have low nitrogen oxide emissions of less than 40 ng/j. So you don’t need to feel guilty while enjoying your hot shower.

Never let the 40-gallon holding tank fool you because this system can provide you with a remarkable 76 gallons of hot water within its first hour. That makes it an ideal water heater for small to medium-sized families with moderate to above-average hot water use.

This tank is shielded with non-CFC foam that prevents any standby heat failure. It also has a magnesium-anode rod with a Vitraglas lining to help protect your system from corrosion. With these security paddings, you are sure to make the most of this water heater for a very long time.

This natural gas water heater has brought forward the ICON system and is also atmospherically vented. The ICON system supports excellent temperature control with diagnostics, while being atmospherically vented means that the whole system’s airflow is regulated.

Moreover, it boasts a Hydrojet performance system that enhances both performance and efficiency at the same time. The Hydrojet self-cleans the tank, thus reducing the time and effort to do any maintenance.

Furthermore, Bradford’s RG240T6N has a separate Thermowell, which means no prerequisites are needed to separate the gas valve when draining the tank.

Some drawbacks of this water heater system are its tendency to be easily dented and some reported leakage issues. In summary, this water heater is a top-quality product that can serve you for a long time. It is considered the most trusted gas-operated water heater by the brand.
What We Like
  • Comes pre-installed with Hydrojet Total Performance System
  • Maintenance-free
  • Long-lasting due to the non-CFC foam shield and magnesium-anode rod
  • The system is atmospherically vented.
  • Ease of access and use
What We Don’t Like
  • Users should be aware of dents
  • Some reported issues of leakage

Noritz EZTR40NG Tankless Water Heater (Outdated)

Besides comparing gas water heater prices, think about the brand of what you’re buying. Remember, no two brands have the same commitment to the performance and quality of their products.

One to trust is NORITZ, which has been around for quite a while, giving consumers peace of mind with reliable offerings like this EZTR40NG indoor water heater.

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.

The manufacturer has designed this with the plumbing on top and has included a valve kit. That’s not all because it also comes with venting, which you can channel through a B-vent. Thus, you can also reduce the cost of installation.

Installing the water heater, you can enjoy hot water endlessly. It is a convenient choice, too, because it does take up much space vs. a larger one. This model is also ideal for a smaller household with up to five members.

However, take note that you need a drain because the 6.6 GPM heater can produce condensation. Remember to check with your gas provider to ensure your gas pressure will be enough for the unit.

Overall, the compact unit is ideal for most families looking for an endless hot water supply for showers and other uses. Check it out for an easy-to-install and little maintenance kit for your water heating needs.

What We Like
  • Reduces the time and cost needed for changing existing venting
  • Can be a direct replacement for an old 40-gallon water heater
  • Quality materials and efficient function
  • Doesn’t take up much space
  • Ideal for small households with up to five members
What We Don’t Like
  • Needs a drain for the condensate it would produce
  • Requires enough gas pressure for the unit

What Is A 40-Gallon Gas Water Heater/ Who Is This For


One of the joys of modern technology is access to hot water with a simple twist of a knob. Gone were the days of endlessly freezing while taking a bath or even skipping your showers on unusually cold days.

A 40 gallon gas hot water heater is one of the many variants of water heaters you can buy on the market. It is a conventional water heater, which constitutes an insulated tank to store all the hot water.

These types are the most common ones and are found in most households. They are also relatively cheap and easy to use.

Among the different fuel sources, this water heater runs on gas. Hence, there is a gas burner at the tank’s bottom. Steam and other byproducts go up the chimney and leave the water heater by the vents.

While they may be expensive at first, gas water heaters become more energy efficient in the long run.

How Does It Work

Conventional water heaters come with a tank where you can store your hot water- ready to be used for your daily household activities.

First, cold water enters the 40 gal water heater tank through a cold water supply tube. The tank itself is made of steel to protect both its exterior and interior. This material also enables the water to heat up quickly.

Next, as the cold water settles, the tank’s bottom is slowly heated by the gas burner.

A gas regulator assembly controls and determines how hot the gas burner is. This regulator usually comes with a thermostat to measure the temperature and turns the burner on/off once the water reaches a specific temperature.

Once the water grows warm enough, it rises and passes through a hot water discharge pipe to provide hot water whenever needed.

The steam, gases, and other byproducts of the heating process leave the tank, go to an exhaust flute, and exit the tank via a vent pipe or, sometimes, a chimney.

Advantages And Disadvantages Of Using 40-Gallon Gas Water Heater


One of the many types of water heaters, gas, or propane water heater tanks, also provides numerous benefits. This section will list down these advantages.

Fast Heating

Compared to electric or hybrid water heater systems, gas or propane water heaters are faster when heating water. As such, you would not have to wait too long when you want to use hot water for a shower or other household activities.

Because of this feature, they are great for larger families since they can easily cope with the high demand. With a 40 gallon propane water heater, you would not have to worry about running out of hot water.

Low energy costs

While they may not be as energy-efficient as other water heater models, gas or propane water heaters incur lower energy costs. That is because the fuel sources it uses (gas or propane) are cheaper and easier to procure.

Cheaper in the long run

Often, gas or propane water heater tanks have higher upfront costs compared to other models. Regardless, with their cheap energy sources, these units enable the user to save more.

Not to mention, they do not require a lot of maintenance compared to other water heater types. Many users clean their units when there are signs of visible dirt. Many even conduct routine check-ups or inspections once or twice a month to check its performance and see if parts need replacement or repair.

Easy to Install

Gas or propane water heater tanks are also easier to install than the other types, especially when you already have an open gas line in your home.

Even if you do not have one, gas or propane water heater tanks are relatively more straightforward to install than the other models. If you have general plumbing knowledge, you are good to go.

However, nothing is stopping you from seeking a professional’s help, too.


These water heater tanks, such as the most trusted 50-gallon gas water heater, are also more convenient. For one, the tank already stores hot water, which is ready at any time for your disposal. As such, you will need to push a button to have it. Also, in case your water heater not heat enough, you can check our water heater blanket reviews here.

Buying Guide


Expensive or affordable 40-gallon gas water heaters come in different shapes, styles, systems, and sizes. As such, I am looking for a good one that might prove to be complicated.

Besides looking at its specifications, you will also need to determine if the unit falls within your price range.

Nonetheless, you can find a suitable model through hard work, patience, and research. To start, you can read different 40 gal gas water heater reviews to see all the top rated 40 gallon gas water heaters in the market.

You can also use this buying guide to see the different factors you need to consider when looking for the top-quality 40 gallon water heater in the market.


The size of the water heater tank you should get depends on your household’s demands. If you have a large family, then a bigger tank is the right choice. At the same time, a smaller one might be most suitable for those living alone.

A 40 gallon hot water storage tank is excellent for those with a family of at least five people or those living in shared spaces. With this size, you will have enough hot water for several hot water showers and other household activities that require hot water.

Tank Material

Most water storage tanks, such as a 40 gal water heater, are made of steel – both their exterior and interior. This material is not only durable, but it also makes the heating process faster. As such, you would not have to wait long for hot water.

Nevertheless, if you want your water heater tank to last longer, consider buying one lined with glass. Steel tanks that are lined with glass are durable and are more resistant to corrosion and similar damages.

Anti-Scale Devices

You should also purchase water heater tanks that have an anti-scale device. Hard water, as we know, often leaves residues that might clog pipes and drains over time. Anti-scale devices help with this problem. These devices work by swirling the water to prevent any buildup.

Digital Display

While style is a matter of the user’s preference, you should purchase a water heater tank with a digital display. This feature enables you to monitor the water and temperature levels easily and even customize its settings. Some units have a vacation mode for efficient water heating.

Valve Type

Drain valves are located at the bottom of your water heater tank and are usually made of plastic or brass. For durability, look for a water heater tank that comes with brass valves. They are generally more durable compared to plastic ones. Moreover, they also do not rust or corrode easily.

Frequently Asked Questions (FAQs)

How long should a 40 gallon gas water heater last?

A 40 gallon power vent gas water heater has the same longevity as a 50- or 80-gallon unit, which is about eight to twelve years. However, brands and models often vary in their gas water lifespan, as does maintenance and care.

Although not absolute, a water heater’s warranty offers a reliable estimate of its quality and, hence, durability. After all, no company will want to give away too many refunds and replacements.

For example, a Richmond 40 gallon gas water heater 12-year warranty offers homeowners peace of mind, knowing the system will last at least a dozen years.

Meanwhile, the A.O. Smith Signature 100 only comes with a six-year coverage. It is the same assurance you will get with the Rheem Professional Classic, although you can extend it with the brand’s ProtectionPlus Upgrade.

As a rule, the most reliable brands provide 40-gallon gas water heaters that can serve your family for 15 years.

According to Consumer Reports, Rheem is one of the most trusted gas water heater companies, although we can add A.O. Smith and Bradford White to the list. You will feel more confident that these gas-powered water heaters will last at least a decade.

How often to flush the 40 gallon gas water heater?

Although manufacturers of 40 gallon natural gas hot water heater units recommend biannual flushing, no clear-cut guidelines as to flushing frequency exist. Some even say once yearly is enough.

However, heater flushing frequency depends on water consumption and quality.

Hard water contains minerals that can clump and cling onto the water heater’s interior components, impacting its ability to work. Scale buildup can undermine the device’s performance and lead to its early demise.

Hence, you might have an A.O. Smith Short 40 gallon water heater that should last ten years but only endure five because of mineral and sediment deposits.

Installing a water softener and filtration system before the water heater should extend the product’s lifespan. These water treatment systems can lighten the appliance’s burden by removing as many contaminants as possible.

Homeowners must also monitor their water consumption. Although 40-gallon heaters are sufficient for a family of four, they might not last long if demand exceeds supply. Interestingly, that also addresses the question, is 40-gallon water heater enough for a family of 4?

Are more expensive 40 gallon gas water heaters better?

Expensive 40-gallon gas hot water heaters are not always better, just as not all higher-priced items have higher quality.

For example, Rheem water heaters are more affordable than Bradford White units, though the latter offers more energy-efficient technologies.

Meanwhile, Rheem commands a respectable following among ordinary homeowners. If you’re not overly concerned about your electrical bill, the variance is negligible.

Compared to A.O. Smith gas water heaters, Rheem units are expensive. However, the price difference does not mean A.O. Smith 40-gallon gas water heaters are pushovers. These products have Energy Star certifications, and some have 12-year warranties.

These examples illustrate how price is relative, depending on what buyers value more.

How long does it take to install a 40 gallon gas water heater?

Installing 40-gallon home water heaters gas units should not take more than three hours, provided no complications or issues arise during the activity. Still, DIY installations might take longer to complete.

What are the most trusted 40-gallon water heater brands?

While branded water tank heaters are not necessarily the best, some companies are known and trusted for producing high-quality and efficient models.

Most of these companies have been in the industry for a long time. Their products are tested by long generations of users who are satisfied with their performance and durability.

Some relatively new companies have also earned their spot due to the ingenuity and efficiency of their products.

Some of these brands include Noritz, Camplux, Rinnai, Rheem, AO Smith, Bradford White, and others. Water heaters made by these companies are generally efficient, durable, and easy on the pocket.

Is Rheem or AO Smith better?

Both companies are known for manufacturing top-of-the-line products that have satisfied generations of users. Because of that, these two brands often buy heads.

On the one hand, AO Smith tends to be the preferred choice for many homeowners and plumbers. Their water tank heaters tend to last for a long time – some up to 30+ years.

Aside from their durability, these water tanks are also efficient as the company focuses on obtaining high LEED ratings.

On the other hand, Rheem is a trustworthy and reliable company. Compared to AO Smith, they offer a wider variety of water tank heaters to suit different tastes and preferences. Compared to AO Smith, their water heaters also tend to be cheaper while still durable and efficient.

How much should it cost to replace a 40-gallon gas water heater?

Many households are equipped with water heater tanks. Depending on the brand and model you choose, water heater tanks differ in their installation costs.

In the United States, the cost to install a new water heater in your home ranges from $400 to $900 for a 40-gallon tank. These prices are without prejudice to the water heater tank’s upfront costs.

If you are planning to hire a professional, installation fees range from $250 to $500.

The brand and the model of your water heater tank also weigh the replacement costs. For one, some units are more difficult to install and remove compared to others. They may have more expensive parts and components, which increases the cost.

The average fee for replacing water heater tanks is $650 for a whole-house water heating system. This price can go up to $1,000, depending on the damages and replacement fees, as well as the difficulty of removal.

Which is better, Bradford White or Rheem?

Bradford White is an old company that has been tried and tested by many households. Their products are patented with a preserving technology called the Vitraglass lining. This lining protects their tanks from rust, corrosion, and other chemical reactions caused by water.

However, Bradford White tends to have a limited selection of products. Not to mention, they charge an installation fee if you want it to be installed by their plumbers.

On the other hand, Rheem offers a wide selection of water heater tanks. As such, you can find varying styles from different lines.

Moreover, the company tends to sell its products wholesale. As such, you might find their products cheaper compared to other brands. They produce some cheap 40 gallon gas water heaters for those tight with their budgets.

Rheem’s products are also easier to install. Plus, they charge a fee. Compared to Bradford White, they also place more extended warranties on their products.

How to use it?

Gas or propane water heater systems usually have an insulated tank that stores water until the user needs it.

How this thing works is that the cold water enters the tank via the pipe. Coldwater settles to the bottom of the tank, where the water heater gas burner heats it.

The hotness of the gas burner depends on its regulator. This regulator comes with a thermostat to monitor the water’s temperature. As such, it automatically turns the whole system off when the water reaches a specific temperature.

The steam, gas, and other byproducts during the heating process go into a valve and are expelled by the water heater via a vent or chimney, depending on its design.

When you need hot water, you will need to press a button. The tank then pumps out the hot water, which quickly goes through the house’s water supply pipes for your use.

Once the water level is low enough, the water heater tank automatically refills it with cold water. Then the entire process starts again.

The water heater continues to heat up the water supply day and night to maintain its temperature, even if no one is currently using it.

Where to buy?

Water heater tanks are usually found in hardware and construction stores, home depots, and other similar shops. If you want, you can purchase your water tank online via trusted online sites like Amazon, eBay, and the like. If you already have a brand and manufacturer in mind, you can directly visit them on their site and order from there.

Many users advise purchasing the water heater tank in person. Doing it this way will enable you to evaluate and inspect the product thoroughly before purchase. Moreover, you can quickly ask for help from the sales clerk, especially if you are a beginner.


Finding the best 40 gallon gas water heater can be more comfortable with research and comparing good water heaters. Hopefully, this buying guide enlightens you about what to check when looking for one that suits your needs. These tankless heaters come with different specifications and capacities. Determine your family’s needs and pick the right one today!

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