Best 40 gallon Gas Water Heaters in 2022|Amazon Recommended

It’s natural that you won’t prefer to wait to heat the water for your morning shower.

Undoubtedly, the majority of the people will feel the same like you. But in cold months, we cannot do without hot water. A potential solution is to use the best 40 gallon gas water heater to meet the needs of cold months.

In fact, life will freeze if there is no heated water during the winter every year. Of course, you might differ with my idea but if you do not have the water heater, your daily life will paralyze.

You need the water for some routine tasks like shower, cleaning, cooking and more. On average, you may need around 80 – 100 gallons of water a day. But this is not possible to heat water worth 100 gallons at a time.

Using the 40 gallon gas water heater, you can gradually satisfy the daily needs of you and your family. 

So, why late, let’s start exploring the 40 gallon gas water heaters.

  • Heater Selection process 

It’s an epic. During the selection process, we had to undergo several ways to find out the best ones. Almost all the available water heaters have similar features. But to sort out the best of the bests, we discussed the issue with the first-hand users. Moreover, we also interviewed some sellers to get their opinions.

Since I am also a user of such 40 gallon gas water heaters, I have applied my expertise to select the products.

Based on all the research, we have set 10 best products for your convenience. The brief reviews here will help you decide to get yours.

Let’s check the products below.

1. Noritz EZTR40NG 40 gal Tank Replacement Indoor Tankless Water Heater 

Noritz is one of the leading tankless water heater manufacturers. I have used one heater from this brand and was highly satisfied.

Besides, many of the first-hand users have also 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 from polypropylene and 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 for the easy installation of the heater. Even, you can install the heater on a gas line without causing any damage to the line or surroundings. It takes less time. Besides, the gas consumption is also low. So, it will save your bucks too.

  • Positive Sign
  • Energy efficient.
  • Easy installation.
  • Heats 6.6 gallons in a minute.
  • Made with durable materials.
  • Flexible vent kit.
  • Unlimited hot water.
  • Negative Sign
  • Price is a bit higher.
  • System cleaning is complex.

2. Stiebel Eltron Tankless Water Heater – Tempra 36 Plus 

You know, what is the critical issue for the users with a water heater?

Well, if you can’t guess, let me expose the fact. The answer is – waiting for hot water. Amid hundreds of business, you would be unable to invest some more time to get some hot water.

But in most cases, people are compelled to do so. They need to wait until the water gets hot.

With this Stiebel gas water heater, you need not wait anymore. You will get hot water on your demand and at any time of the day. The brand is reputed and been serving for a long time. This particular water heater provides fresh hot water for everyday use.

We picked this model for its capacity to provide a large amount of water. Moreover, you can also cut energy consumption while using this heater. Setting the temperature has never been so easier. With the advanced flow control feature, you can easily set the water flow too.

  • Positive Sign
  • Dual types of warranty.
  • Simple installation.
  • High water flow to cover a large residence.
  • Steady temperature.
  • Scalding hot water protection.
  • Self-modulating technology.
  • Negative Sign
  • 300AMP electric service needed.
  • Water temperature is not stable always.

3. Stiebel Eltron 223421 240V, 1 Phase, 50/60 Hz, 15 kW Tempra 15 Whole House Tankless Electric Water

As I said earlier, Stieble is one of the leading tankless water heart producers; I have selected another product from this brand. This particular will provide hot water instantly whenever you need it.

At the same time, it will reduce the monthly electricity bill for your home.  

But the traditional tanks are a bit different than this one. However, this hot water heater is moderate in size, and you can install it anywhere at your home. The performance is reliable and runs well in the common climatic conditions. The water flow rate is also smart that can cover a couple of bathrooms at home easily.

Self-modulating technology is the other feature that you will fall in love with. The heating elements inside the heater are up to the mark. Besides, if you are in trouble for installation or any other issues, you can have instant support from this German manufacturer.

  • Positive Sign
  • Corrosion resistant.
  • Energy efficient.
  • Instant water supply.
  • Suitable for a small household.
  • Easy installation.
  • Less maintenance.
  • Negative Sign
  • Less warranty period
  • Not ideal for older homes. 

4. Rheem 240V 2 Heating Chambers RTEX-18 Residential Tankless Water Heater

Energy efficiency is one of the prime issues that the users are worried about. The situation was the same for me, as well.

Therefore, I tried to get something that will render a quick service and energy efficiency. This Rheem water heater is precisely the one you are looking for.

This is a suitable water heater for a small home. It can cover two bathrooms easily, and you will get water at any time you want. This is the other feature that makes life easier. Your waiting time will be cut in half now.

The use of digital thermostatic control with an LED display will allow you to check and fix the temperature quickly. Besides, the design is compact, and the installation is also simple. Usually, the water heaters need to set following some sophisticated methods. You are also free of those hassles. 

  • Positive Sign
  • Two heating elements.
  • LED display for temperature control.
  • Nonstop hot water supply.
  • Compact design with easy installation.
  • Energy-efficient water heater.
  • Maximum seven-gallon flow.
  • Negative Sign
  • LED may flicker.
  • Trouble with water flow management.

5. Eemax EEM24027 Electric Tankless Water Heater

Eemax products are standard, and you will love the product for its outstanding features. This is a beautiful model and will provide optimum benefit to you.

Most importantly, you will get the hot water on your demand. The heater can also cover a moderately large house with hot water flow.

Another impressive benefit is the application of modern technology. Most of the ordinary water heaters are not associated with technology. But it has some features like advanced temperature control, fluctuation minimization, and others. Besides, the heater is energy efficient.

Moreover, the product is durable and looks great after installation. Most of the users admire the water heater for the durable material used in manufacturing. They also love the compactness of the product. Due to the compact size, you can install the heater anywhere you want – even under your sink. 

  • Positive Sign
  • Runs with 240V.
  • No standby heat loss.
  • Immediate water heating.
  • Advanced water flow.
  • Temperature sensors.
  • Fluctuation minimization
  • Negative Sign
  • Less warranty period.
  • Temperature display may cause trouble.

Food for thoughts!


Do you know the difference between hot coffee and cold coffee?

Well, the water of hot coffee is heated. And there is an absence of heat in the water of the cold coffee. Simple!! 


Well, this is an issue of debate. Use the comment section to post your thoughts, and we shall have a friendly discussion there.

6. A.O. Smith ENS-40 ProMax Short Electric Water Heater, 40 gal

If you are looking for quality and luxury, this is the right product for you. This is a great gas water heater that provides value to your investment.

The use of the Permaglas glass coating makes the heater more effective. Besides, the low-watt density copper also makes it energy efficient.

You can depend on the heater for years as it comes from the top quality materials. Installation is another issue that irritates users. But there are no such issues with this water heater. If you want, you can install the heater at any part of your home. Heating capacity gets a boost here too.

Energy consumption is the other factor. This A. O. Smith ENS-40 consumes less energy than conventional water heaters. Anode rod of the heater is another wonder. It protects the tank much better than other standard rods.

  • Positive Sign
  • Two copper heating elements.
  • Adjustable thermostat.
  • Non-CFC polyurethane foam to prevent heat loss.
  • Corrosion resistant.
  • Easy installation.
  • Six-year warranty.
  • Negative Sign
  • No visible cons are available.

7. Stiebel Eltron 224199 240V Tankless Electric Water Heater

Do you know the best benefit of a tankless water heater? Well, they do not have any tank. So, the installation process is simple. Besides, they provide hot water round the day. 

You do not need to spend time waiting for the hot water. They will render the hot water instantly. So, a large number of people are getting those heaters.

Among the hundreds of such heaters, Stiebel Eltron is on the leading position. It has advanced technology. Besides, the heater does not consume much energy. So, you are free of worries about paying the electricity bills.

Moreover, you will get an advanced flow control feature. As a result, temperature control is not a big deal now. The steady temperature level ensures you to get the right amount of heat on the water. At the same time, the heater supplies hot water without any interruption.

  • Positive Sign
  • Advanced technology.
  • Nonstop hot water supply.
  • Energy efficient.
  • Easy installation at home.
  • Space-saving and sleek design.
  • Durable materials.
  • Negative Sign
  • Professional installation required.
  • Does not performs as advertised.

8. Rinnai V Series HE Tankless Hot Water Heater: Indoor Installation

Of course, money matters. And when you are purchasing the best price 40 gallon gas water heater, you must be careful.

A notable number of manufacturers offer lucrative prices with limited warranty or features. But not all the features are applicable all the time.

So, if you need the best 40 gallon gas hot water heater within a reasonable price, this is your product. Besides, this is the combination of a higher level of efficiency and value. The product has a distinctive outlook and compact in size and shape. As a result, you can install it even in a smaller space.

On the other part, the brand is also famous globally. They provide a significant warranty period for this product. It is not to compete with the other gas water heater producers; it is for your peace of mind. So, you can have this product for your home without a second thought.

  • Positive Sign
  • Compact size with quality materials.
  • Continuous hot water supply.
  • Scale detection to prevent damages.
  • Temperature lock for stability.
  • 10-year residential warranty.
  • Durable product.
  • Negative Sign
  • Three 3 gallons of water in an hour.
  • No customer support available.

9. Rheem 40 gal. Residential Gas Water Heater, NG, 38000 BtuH

During our interview with the first-hand users, they were dissatisfied with the durability. Many of the heaters were less durable than expected. They could not match the features in real life. So, it was like a nightmare to them.

Expecting something and not getting that thing hurts. Therefore, we have selected this particular water heater.

First of all, the price is reasonable, and the heater generally lasts longer. This is a natural gas water heater with the capacity to provide ample hot water for a four-member family. Moreover, you will get water in the hot state all the time. No wastage of time in waiting is applicable here.

On the other part, the ignition system is secured while the maintenance is more comfortable, as well. Many of the water heaters need support, which is complicated. But you will have no such issues here. System performance is also monitored from inside the heater. Hence, you are free of any troubles.

  • Positive Sign
  • Push button for heater ignition.
  • No filter cleaning.
  • Premium anode rod.
  • Pressure relief valve.
  • Easy and quick installation.
  • Free combustion air intake system.
  • Negative Sign
  • Suitable for a small family.
  • Valves may get damaged.

10. A.O. Smith GCR-40 ProMax Plus High Efficiency Gas Water Heater, 40 gal

We have reached the last phase of the product review. This is our last product and contains certain amazing features.

If you look for a product that will last long and serve you the best, you will find it suitable.

The water heater can deliver 70 gallons of water in an hour. This is genuinely a considerable amount. At the same time, the recovery rate is 41 gallons in an hour. Energy is not an issue here. The heater is highly energy efficient.

On the other part, the heater comes with a significant warranty period. It provides a six-year warranty but to some limited extent. Besides, the blue diamond glass coating extends the life of the heater. It prevents corrosion in the tank. So, you are getting a remarkable gas water heater at a moderate price.

  • Positive Sign
  • Corrosion resistant tank.
  • Sediment reduction through the diffuser dip tube.
  • Stainless steel core anode rod.
  • Prevents stand-by energy loss.
  • Push-button ignition.
  • Top water connection.
  • Negative Sign
  • Weight is a bit more than usual.
  • Burner plate damage.

What experts say about the best price 40 gallon gas       water heater?

During the research of these products, I also had some discussions with water heater experts. They have some views that I am sharing here.


Most of them believe that water heaters will last longer if they are well maintained. Due to the lack of maintenance, the majority of the gas water heaters fail to function correctly. So, they suggest getting a product that requires less maintenance. In fact, you are to take care of lots of other things.

So, you cannot manage time to spend after the water heater.


The second thing that they opined was about the features. A substantial number of users do not look into the elements. They get the products based on the advertisements around. But the information on the ads may not provide the complete facts.

There might be some misinformation. As a result, you will have a negative experience. So, every gas water heater users have to check the features with attention. It will help you save from future disasters. 

How to buy the best 40 gallon gas hot water heater

You are going through this part points out that you want to have a gas water heater. I appreciate your attempt to get one of the best ones. But this is not as easy as it sounds.

Of course, you can get a water heater from your nearby seller. But chances are higher that you may not have the best product. Or you may not have a suitable one. This is highly important to have a suitable one as you are not getting a water heater every week.

The instructions from our experts below will help you get the right gas water heater for your use.

Energy efficiency

First of all, you need to consider energy efficiency. A gas water heater does not operate with air. It needs fuel for the operation. And if you use the fuel, you will need energy. As a result, you must have to pay the bills at the end of the month.

But an energy-efficient gas water heater can bring a sense of comfort every month.

Know your needs

Besides, you have to know the needs of you and your family. Remember, not all gas water heaters can provide water for every type of family. Considering the number of family members, the manufacturers set the water supply capacity.

If you have a family of ten members and a larger home, you cannot expect a better service from a small heater. In that case, you are to get a more extensive product in line with your family member numbers.

So, this is important to know the needs.

Heater size matters

As the gas water heaters are tankless, they are smaller in size and shape. Generally, the water heaters with tanks are larger. And this is tough to install them as well. You will get a gas water heater for its compact size and shape.

But if the size is large and needs much space, you need to skip the idea of getting that particular product. Instead, keep searching and get a water heater that is smaller in size. Usually, you can install the smaller water heaters anywhere you want.

Water supply capacity

Moreover, you also must know about the water supply capacity of the heater. There are some water heaters which can supply over 50 gallons of water in an hour. On the contrary, you will get water heaters that provide only three gallons an hour.

So, based on your necessities, you have to get the water heater that provides ample hot water to meet needs.

Temperature control

On the other part, check the temperature control feature. If you cannot control the temperature, you will be in trouble. The water may get too hot, or it will only be warm, which will not fit your box. Your experience will be below standard.

Therefore, this is important to check this particular feature. Make sure you can lock or adjust the temperature. If there are no such features, move for the next product.

LED display

In the present day, the use of LED display plays a significant role. With the display, you can instantly know about the temperature level. Besides, it helps to customize the temperature as well. So, this is a must with the water heater.

But if there are no such features, experts recommend to give up the idea of having that water heater. Those products are not efficient, and you will be in terrible trouble in the future while using them.

Frequently Asked Questions

Q: What does unlimited hot water supply refer to?

A: Unlimited hot water refers to that you will get hot water as much as you want. Generally, the water heaters with tanks can provide hot water as long as the tank is filled. But with the tankless water heater, there are no such issues. The heating device will continuously provide you with hot water. And you will get as long as you want.

Q: Please explain the temperature control?

A: Temperature control is the way to keep the water temperature in a stable state. In fact, this is highly important as if the temperature level is changed, you will either get too hot water or cold water. So, the mainstream water heater producers keep the provisions of temperature control.

Q: What is a warranty period for a gas water heater?

A: A warranty period refers to the particular point of time when the manufacturer will repair the product at no cost. But there are certain aspects. To avail the warranty, you are to follow their instructions. And if there is any violation of the conditions, your warranty period will not be valid.  

Last words


We have shared our thoughts and views. Now, it is your turn to select the best 40 gallon gas water heater. From the reviews above, surely you have developed ideas about the best price 40 gallon gas water heater. They are truly adorable.

So, don’t wait for the winter to leave. Get your best 40 gallon gas hot water heater today, and share your thoughts in the comment section.

It would be a great success if you can select the best product for your home after checking the reviews above.