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Need a new 40 gallon gas water heater? Check out our top 10 picks for the best options in 2022.

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Positive feelings from past customers

  • Never run out of hot water

  • Easy to install

  • Lasts a long time

  • Good value

Negative feelings from past customers

  • The product is overpriced and underserviced

  • The water heater is made to fail

The Bradford White 40 Gallon Natural Gas Water Heater is a great choice for your home. With the Atmospheric Vent FVIR Defender Safety System, you'll have enhanced performance and advanced temperature control. This water heater also features the exclusive green LED light that prompts the installer during start-up and provides ten different diagnostic codes to assist in troubleshooting. The Hydrojet Total Performance System is a great feature that helps prevent sediment build-up in the tank and increases the first hour delivery of hot water.


The Bradford White 40 Gallon Natural Gas Water Heater is a reliable and efficient choice for your home. The ICON System and Advanced ScreenLok Technology work together to provide a safe and consistent supply of hot water. The Resettable Thermal Switch prevents the unit from overloading, and the Maintenance-Free design means you'll never have to worry about servicing the unit. The Hydrojet Total Performance System ensures that your water heater will perform at its best for years to come.


Overall, users seem fairly positive about the product, with 46% giving it a five-star rating. However, 29% of users gave it a one-star rating, so there is room for improvement.


According to user reviews, the Bradford White 40 Gallon Natural Gas Water Heater is an excellent choice for those in need of a reliable and powerful water heater. Its features include a 40-gallon tank, a natural gas fuel source, and a recovery rate of 36 gallons per hour. Users also appreciate the fact that this water heater is easy to install and comes with a 6-year limited warranty.

$1249.99 AT AMAZON

Negative feelings from past customers

  • Service personnel are rude and uninformed.

A.O. Smith's ENS-40 ProMax Short Electric Water Heater is a great choice for those looking for an energy efficient and reliable water heater. This model meets the energy efficiency requirements set forth by the Department of Energy and qualifies for most utility rebate programs. It is also equipped with Permaglas glass coating, certified T&P relief valve, and long-lasting low-watt density copper heating elements. The Dynaclean dip tube reduces lime and sediment buildup for years of dependable hot water.


A.O. Smith ENS-40 ProMax Short Electric Water Heater, 40 gal is a water heater that features a Permaglas glass coating that protects the steel tank from corrosion and maximizes tank life. The Dynaclean diffuser dip tube helps reduce lime and sediment buildup while maximizing hot water output. The CoreGard anode rode aluminum anode with stainless steel core protects the tank against corrosion longer than ordinary steel anodes. The water heater also features a durable, tamper-resistant brass drain valve and meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA).


The sentiment in these reviews is generally positive, with 43% of users giving the game a 5-star rating. However, there is a significant minority of 12% who gave it a 1-star rating, indicating that some users were not thrilled with the game.


According to user reviews, the A.O. Smith ENS-40 ProMax Short Electric Water Heater is a reliable and efficient water heater. It is easy to install and use, and has a compact design that makes it perfect for small spaces. It heats water quickly and evenly, and is durable and long-lasting. Overall, users are very satisfied with this product and would recommend it to others.

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The Reliance 6-40-NOCT 400 35500 BTU Tall Natural Gas Water Heater is a 40 gallon water heater that is tall, has a 35,500 BTU, and 2" insulation. It is for installations up to 10,100', has a 62 energy factor, and a recovery at a 90 degrees rise-gallons/hours 36. The first hour rating is 67, the draft diverter outlet size is 3" with an integrated Adapter for 4" vent option, and the T & P relief valve is glass lined. The tank is made of anode rod, PEX polymer lined heat trap nipples, and a PEX dip tube. The unit is next generation fvir approved, has a stainless steel flame arrestor, and the air intake is located at the entire base of the heater. The door mounted manual reset temperature cut off is elf powered, and the Honeywell millivolt Generator gas control valve is located on the unit. The dimensions of the unit are 62"H x 20"D, and it has a 6 year tank & parts warranty.


The Reliance 6-40-NOCT 400 35500 BTU Tall Natural Gas Water Heater is a tall water heater that is designed for natural gas installations. It has a pex polymer lined heat trap nipple and an aluminum anode rod. It is also designed for installations up to 10 feet.


$1116.73 AT AMAZON

Positive feelings from past customers

  • The product is easy to install

  • The product is quiet

  • The product is a good value

Negative feelings from past customers

  • It's difficult to install

  • It's difficult to find replacement parts

  • It's expensive

The Bosch Thermotechnology Tronic 5000 T 40-Gallon Standard Electric Storage Water Heater is a top of the line product that provides ample hot water and comfort for the whole household. Some of its key features include a 10-year tank and parts limited warranty, as well as being a leading source of high quality water heating and comfort systems.


The Bosch Thermotechnology Tronic 5000 T 40-Gallon Standard Electric Storage Water is a perfect size for a maintenance closet, access closet under the stairs, or crawl space. It is also ideal for replacement projects. This water heater has two magnesium anode rods for extra tank protection, a dielectric heat trap, and a heavy-gauge steel tank for extra years of trouble-free service. In addition, the glass-lined steel tank helps prevent corrosion. The Bosch Thermotechnology Tronic 5000 T 40-Gallon Standard Electric Storage Water also has a 10-year tank and parts limited warranty. This water heater is HFO foam insulated, reducing fuel costs and increasing energy efficiency. Additionally, the double heating elements conserve energy, and the Incoloy elements provide a long-lasting unit. The Bosch Thermotechnology Tronic 5000 T 40-Gallon Standard Electric Storage Water is also convenient with factory-installed electric hot and cold water connections for extended tank life, an easy-to-use plastic drain valve for maintenance, and factory-installed heat traps that reduce heat loss. Finally, the Bosch Thermotechnology Tronic 5000 T 40-Gallon Standard Electric Storage Water comes with a temperature and pressure relief valve included.


The sentiment among users is generally positive, with 77% giving the game a five-star rating. However, 12% of users give it a one-star rating, indicating that there is some dissatisfaction with the game.


According to user reviews, the Bosch Thermotechnology Tronic 5000 T 40-Gallon Standard Electric Storage Water Heater (ES40M) is a reliable and efficient water heater that is perfect for use in both residential and commercial settings. This water heater features an advanced thermal protection system that prevents overheating, as well as a self-cleaning function that helps to keep the unit clean and free of sediment build-up. The Bosch Thermotechnology Tronic 5000 T 40-Gallon Standard Electric Storage Water Heater also comes with a 6-year limited warranty, making it a great choice for those looking for a long-lasting and reliable water heater.

$862.71 AT AMAZON

Positive feelings from past customers

  • The water heater is a space saver

  • It raised the home value in their area

Negative feelings from past customers

  • Arrived with cosmetic damage and pinched wires

  • Now I have to order another water heater

  • I want the same size heater

  • The front panel was damaged when it arrived

  • Looked like it had been dropped several times

provides hot water on demand and only when needed, which saves both energy and money. This unit also has a self-cleaning feature that helps to prolong its life. With a compact design, it can be installed almost anywhere inside the home. The Rheem Prestige High Efficiency 9.5GPM Indoor Natural Gas Tankless Water Heater is a great way to save both energy and money. This unit provides hot water on demand and only when needed, which can help save you money on your energy bill. This unit also has a self-cleaning feature that helps to prolong its life, making it a great investment for your home.


The Rheem Prestige High Efficiency 9.5GPM Indoor Natural Gas Tankless Water Heater provides hot water without the wait - or the waste. With a low operating cost and high energy efficiency, this unit is perfect for a tank replacement. The compact, space-saving design is perfect for indoor use. The unit also features water & gas leak detection, which will shut down the unit and provide an error code.


Overall, reviewers seem to be quite happy with the product, giving it a 69% five star rating. However, 9% of reviewers gave it a one star rating, so there is some room for improvement.


According to user reviews, the Rheem Prestige High Efficiency 9.5GPM Indoor Natural Gas Tankless Water Heater is an excellent product that provides quick, hot water with no issues. It is easy to install and operate, and is very efficient. Some users report minor problems with the unit, but overall it is a highly rated product.

$1499 AT AMAZON

Positive feelings from past customers

  • Great product

  • Arrived on time

  • Very satisfied

  • Exactly what was needed

  • A great savings

Negative feelings from past customers

  • The product came with manfacturers defects

  • The product is junk and does not last long

. The 100 gallon model is an atmospheric vent type with a Honeywell electronic gas valve. The Rheem G100-200 is a natural gas water heater designed for commercial applications. It has a 100 gallon capacity and is an atmospheric vent type with a Honeywell electronic gas valve.


The Rheem G100-200 Natural Gas Universal Commercial Water Heater has a BTU of 199,900 and a universal tank design. It also has a universal space saver design, patented multi-flue tank design, and low profile automatic flue damper.


The sentiment is positive, with 58% of users giving the game a 5-star rating. 29% of users give it a 1-star rating.


According to user reviews, the Rheem G100-200 Natural Gas Universal Commercial Water Heater is a reliable and durable water heater that is perfect for businesses or homes with high demand for hot water. It is easy to install and has a simple design that makes it easy to use. This water heater is also very efficient, meaning it will save you money on your energy bills.

$5398 AT AMAZON

Positive feelings from past customers

  • Just what I expected

Negative feelings from past customers

  • Takes a long time to heat up

  • Not very efficient

The replaceable combustion chamber liner is made of corrosion-resistant stainless steel. The anode rod is also made of corrosion-resistant stainless steel to extend the life of the tank. The unit's gas controls are factory installed and tested for ease of installation and performance. The 100-gallon model has a recovery rate of 193 gallons per hour and a first-hour delivery of 1021 gallons. The Rheem G100-80 Natural Gas Universal Commercial Water Heater is a great choice for applications requiring large quantities of hot water. This model has a recovery rate of 193 gallons per hour and a first-hour delivery of 1021 gallons. The replaceable combustion chamber liner is made of corrosion-resistant stainless steel, and the anode rod is also made of corrosion-resistant stainless steel to extend the life of the tank. The unit's gas controls are factory installed and tested for ease of installation and performance.


The Rheem G100-80 Natural Gas Universal Commercial Water Heater is a 100 gallon water heater with a 75,000 BTU output. It features a universal tank design that is compatible with a wide range of Rheem commercial water heater models. The universal space saver design allows for easy installation in a variety of locations. The patented multi-flue tank design provides superior performance and durability. The low profile automatic flue damper minimizes heat loss and maximizes efficiency.


The user review sentiment for this product is extremely positive, with a 100% five star rating.


According to user reviews, the Rheem G100-80 Natural Gas Universal Commercial Water Heater is an excellent product that is easy to install and provides plenty of hot water. This water heater is also very efficient, saving users money on their energy bills. Overall, reviewers are very happy with this product and recommend it to others.

$2750 AT AMAZON

Positive feelings from past customers

  • Easy to install

  • Great for backyard use or ADU

  • Hard to install

Negative feelings from past customers

  • Hard to install

  • Better be a good plumber

  • Terrible customer support

The FOGATTI Natural Gas Tankless Water Heater is a great choice for your home improvement needs. This product features an 8.1 GPM flow rate and a 180,000 BTU output. It also has a compact design that makes it perfect for small spaces.


The FOGATTI Natural Gas Tankless Water Heater is a high-quality, durable water heater that provides hot water on demand. With a maximum flow rate of 8.1 gallons per minute and a heating capacity of 180,000 BTUs, the FOGATTI is suitable for 3-5 outlet points. It is certified by the CSA in the United States and Canada and comes with a 5-year warranty on the heat exchanger and 2-year warranty on other parts.


The vast majority of users seem to be happy with the product, giving it a five star rating. However, there is a significant minority of users who are unhappy with the product, giving it a one star rating.


According to user reviews, this natural gas tankless water heater is great for those who want instant hot water. It is easy to install and is very efficient. Additionally, it is much more compact than a traditional water heater, making it perfect for small spaces.

$699 AT AMAZON

Positive feelings from past customers

  • Easy installation

  • Compact size

  • Continuous hot water

  • Saves space

  • Electric bill went down

The Stiebel Eltron Tempra 36 Plus Tankless Water Heater is a state-of-the-art water heater that uses advanced technology to provide continuous hot water on demand. It is highly energy efficient, saving 15-20% on energy costs compared to conventional electric tank water heaters. The Tempra 36 Plus is also lead-free and has been tested and certified by WQA against NSF/ANSI 372 for compliance.


The Stiebel Eltron Tankless Heater is an on-demand water heater that provides a continuous and unlimited supply of hot water. It has a sleek design that saves space and does not require venting. The electronic switch is activated for virtually silent operation. The copper sheathed heating element is housed in a copper cylinder. There is a 7 year leakage warranty and a 3 year parts warranty.


The vast majority of users who have reviewed the product have given it a 5-star rating, indicating that they are generally very satisfied with it. There are a small number of 1-star reviews, but these are outnumbered by the 5-star reviews by more than 15 to 1.


According to user reviews, the Stiebel Eltron Tankless Heater is an excellent product that provides an endless supply of hot water. It is very efficient and can save a lot of money on your energy bill. The unit is also very easy to install and has a sleek design.

$812.3 AT AMAZON

Positive feelings from past customers

  • It provides endless hot water

  • It is easy to install

  • It saves space

  • It has a nice appearance

The Rinnai RL94eN Non-Condensing Natural Gas Tankless Water Heater is a compact, tankless water heater that provides an endless supply of hot water. The original design of the tankless hot water heater's Circ-Logic technology offers recirculation patterns that match your habits. The smart, durable design includes a 12-, 5-, and 1-year residential guarantee and a 5-, 5-, and 1-year commercial factory warranty for the heat exchanger, labor, and parts, respectively. The Rinnai RL94eN is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 9.8 GPM (6 fixtures at once). Professional installation is recommended.


The vast majority of users who have rated this product give it high marks, with 77% giving it 5 stars. Only 7% of users give it just 1 star.


According to user reviews, the Rinnai RL94eN is a great non-condensing natural gas tankless water heater that is perfect for outdoor installation. It has a maximum flow rate of 9.8 gallons per minute and is made with high quality materials that make it durable and long lasting. This water heater is also very easy to install and use, and comes with a great warranty.

$1525.6 AT AMAZON

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