9 Best Rated 40 Gallon Water Heaters of 2020 – Ideal for every household!

9 Best Rated 40 Gallon Water Heaters of 2020 - Ideal for every household!

40 Gallon Water Heaters

A water heater is an essential appliance and found in everyone’s home. Probably, a family requires a lot of hot water used for various actions. Though you can use heated water for showers, dishwashing, automatic handwashing, etc. On average, you may require 100 gallons of hot water.

But, you cannot buy hot water holding a storage capacity of 100 gallons. The performance of the hot water is based on its First Hour Rating and the energy factor. As per my knowledge, 40 Gallon Water Heater is the most efficient and high rated water heater.

Best 40 Gallon Water Heater Reviews 2020

The best 40 Gal Water Heater works with more exceptional performance and best suitable for a family with three to four people. Its efficiency calculated on the First Hour Rating of the water heater. Water Heater 40 Gallon the most commonly used storage-tank water heater. However, best 40 gallon gas hot water heater uses an insulator to heat the water in the storage tank.

40 Gal Hot Water Heater manufactures with the valves to transfer the hot water at desired outlets. The 40 Gallon Water Heater uses natural gas or electricity to heat the water in the tank. As a result, Hot Water Heaters featured with advanced technologies work very efficiently.

Best Rated 40 Gal Water Heaters of 2020

Isn’t it challenging to go for all brands, sort out the 40 gallons water heaters, list out, compare and choose one among them? Yes, it is because by listing out in that way, you will get so many products, and it kills your time as well.

Here we have done such research and listed Top 9 40-gallon water heaters. It has different brands and specifications. They stood as the best water heaters of 40 gallons in the market. So, check all the factors and pick the right one for you.

Top 9 Best 40 Gallon Water Heaters for Sale 2020

Best Compact Water Hetaer

Ecosmart ECO 36 36kw 240V Tankless Water Heater

Ecosmart ECO 36 Electric Tankless Water Heater image

Best Tankless Water Heater

Excel Pro Tankless Gas Water Heater

GASFLEX JSD10D 10D White Excel Pro Tankless Gas Water Heater image

Best Commercial Water Heater

Bradford White RG240T6N Water Heater

Bradford White RG240T6N 40 Gallon Natural Gas Water Heater image

Most 40-gallon water heaters are big enough to take up too much where they are placed, which is why this electric tankless water heater is right as it saves a lot of space because of its compact design. This one will consume 90% less space than any other similar water heater.

  • Self-modulating technology

  • Digital temperature control

  • 0.3 GPM activation flow

  • Lifetime warranty

  • Copper components

The ECO 36 is one of the best electric 40 gallon water heater out of the entire line of similar water heaters that Eco smart has. Its surprising to find that it can handle a large single-family home where multiple appliances are using that hot water, no matter if its in colder climates also. If you look at its capacity, you can have four showers and two sinks running simultaneously, and there will equal flow of water in each one of them. Its smart technology helps you save a lot of energy as well because every time you won’t be using it to full. It will adjust energy usage based on how much hot water is needed.

This way you won’t have to worry about your energy bills, every time you switch on the water heater. There are digital controls also present that allow you to customize its functioning even more. As soon as you switch it on, the flow rate will start at 0.3 GPM and go up to 6 GPM in no time.  Although there are protection mechanisms for sudden surges. All its components designed for efficiency at its best, while its stylish design is also pleasing to the eye. As compared to the other water heaters, it saves almost 90% of the required space because of its tankless design.





Tankless and a powerful water heater are hard to find. Still, that combination is very much possible through this excel pro tankless water heater that is smaller than your usual water heaters but is no less in power and delivers 140000 BTU per hour.

  • Digital display

  • 6.6 GPM flow rate

  • Copper heat exchanger

  • 140000 BTU output

  • 0.84 energy factor

This portable water heater isn’t powerful just because of the output that it gives per hour. Its GPM is also better than any other you will find in the same range. A flow rate of a maximum of 6.6 GPM is commendable, especially for a tankless water heater. You won’t be just saving energy through its tankless operation, but you will have enough hot water whenever required and that too running freely. Its heat modulation technology is also quite helpful in that because it helps the water heater determine the heat output according to the flow of water.

Sometimes you don’t have enough water, but heater keeps running, which is what won’t happen if you have this water heater installed in your home. Its power vent is also easily installed vertically or through the walls, whichever seems fit for your house. As compared to the best 40 gallon water heate gas it is a European model, so the temperature reading will also be in Celsius. If you plan to install a 40-gallon heater, then this energy-saving mode is a better option because it can do everything a proper 40-gallon model would and still consume less energy and space.





Bradford White Water Heater RG240T6N embedded with an ICON system. Hence, this enables an intelligent gas control and a push-button igniter. It requires less maintenance and featured with a resettable thermal switch. The reviews of it results in high First Hour gas water heater ratings 40 gallon and maximum energy efficiency.

  • Bradford White ICON System

  • Maintenance-Free

  • Resettable Thermal Switch

  • Advanced ScreenLock Technology

The RG240T6N Bradford White equipped with an Advanced Screen Lock Technology Flame Arrestor Design. It is fabricated with factory-installed hydro jet total performance system. Therefore, the best gas water heaters 40 gallon ,Bradford White RG240T6N Price is affordable and available only at Amazon Sale.





AO Smith GCR 40 Gallon Water Heater comes with a blue diamond glass coating, and it looks fantastic in your home. Also, AO Smith Water Heater 40 Gallon Gas offers you resistance corrosion to the glass lining of the water heater. It was designed with an internal microprocessor. However, it enables you to sense and gain a faster heating response.

A.O. Smith Promax Water Heater embedded with a diffuser dip tube of Dynaclean. Therefore, it produces maximum hot water at the outlets, thus reducing the formation of lime and sediments. This best gas hot water heater 40 gallon equipped with a self-powered electronic gas valve that uses thermopile. Hence, this thermopile used to generate the power needed for the operation of electronic gas control. Promax Plus is made up of long-lasting PEX cross-linked polymer.

  • Two-pipe combustion system

  • Self-powered electronic gas valve

  • Long-lasting PEX cross-linked polymer

AO Smith GCR 40 Gal Electric Heater provides you tighter differentials and improved operating parameters. It meets all the requirements and standards put forth by NAECA. Hence, it facilitated a wide range of heating solutions. However, AO Smith 40 Gallon Water Heater is the most efficient and reduces maximum utility bills.

This AO Smith 40 Gallon Electric Water Heater is best suitable for families who require a large amount of hot water and it is featured with a difficult installation procedure. It allows you to vent up to 40 feet. Hence, 40 Gal electric water heater is engineered with two-pipe combustion systems. As a result, there is no need to worry about AO Smith Water Heater 40 Gal indoor installation as it draws clean air from outside.





Westinghouse 40 Gallon 5500W Lifetime Warranty Water Heater works with an energy factor of 0.95 EF. This Electric Water Heater is best suitable for households consisting of four to five peoples. However, it is manufactured with a laser-welded corrosion resistance stainless steel. Westinghouse WER040C2X055N06 water heater delivers hot water of 64 gallons in First Hour.

  • 95 energy factor

  • Laser welded 316L stainless steel

  • Energy efficient

  • Durable

The Westinghouse 40 Gallon Electric Water Heater directs cold water near the heating elements. Hence, it does not produce any mixing of cold water and offers the desired temperature of hot water. Westinghouse 40 Gal Hot Water Heater equipped with high efficiency and low standby loss. In conclusion, it heats water in the tank using 5500 wattage power and 240-volt electric source. As per Westinghouse 316L 40 gallon gas water heater reviews, the pros and cons are listed below.





Rheem MR40245 Marathon Electric Water Heater 40 Gal fabricated with a polybutene seamless tank. Therefore, this Rheem 40 gallon gas water heater is resistant to rust and corrosion. It works very efficiently and saves maximum energy. However, it works on 240 voltage and power of 2 X 4500 Watts.

The Rheem Electric Water Heater 40 Gallon has a recovery rate of 21 GPH at 90 degrees F rise in temperature. Hence, best 40 Gallon Water Heaters featured with Envirofoam insulation for long-lasting use. Marathon height is 61.5 inches and a jacket diameter of 21.75 inches. It includes factory-installed T and P valves for an easy outlet of the hot water.

  • Lightweight

  • Durable

  • Energy Efficient

  • Non Metallic Water Heater

Rheem MR40245 Marathon Electric Water has a polysulfone dip tube with a high temperature. It is equipped with multiple layers of the filament. However, Rheem 40 Gallon Water Heater filament wound on the fiberglass tank. Also, it is a lightweight, durable, and non-metallic water heater.

Rheem Water Heater 40 Gallons outer shell made up of tough molded polyethylene. As a result, this prevents the Water Heater from scratches, dents, and salt air. As per gas water heater reviews 40 gallon Rheem Marathon works with greater efficiency and high First Hour Rating.





AO Smith Water Heater equipped with a Dynaclean diffuser dip tube, which helps in providing maximum hot water. The AO Smith ENT40 embedded with a longer lifespan. This Hot Water Heater is coated with the Permaglas, which protects the tank from corrosion.

  • Durable

  • Tamper-resistant brass drain valve

  • Dynaclean diffuser dip tube

  • Long-lasting low-watt density copper heating elements

AO Smith ENT-40 is made up of long-lasting PEX cross-linked polymer. It includes an aluminum anode rod. Furthermore, the ENT40 AO Smith Water Heater meets all the standards and conditions put forth by NAECA. This best 40 Gal Gas Water Heater has a temperature and pressure valve.





AO Smith GAHH40 includes a patented pressurized combustion chamber. It produces an energy factor of 0.70 EF. AO Smith Electric Water Heater works on natural gas and heats water with an input of 40,000 BTU/hour. It has a recovery rate of 43 gallons at 90 degrees F rise in temperature.

  • Durable hot surface ignitor

  • 70 Energy Factor

  • High-Efficiency

As a result, this AO Smith Hot Water Heater is equipped with a durable hot surface ignitor. AO Smith GAHH-40 featured with a standard atmospheric vent heater, which also offers you an easy replacement. This best 40 Gallon Gas Water Heater is a fan assisted category 1 appliance.





Lochinvar 40 Gallon Gas Hot Water Heater is designed with a glass-lined steel tank to offer long last use. It produces an energy factor of 0.66 EF. This best natural gas water heater 40 gallon works with high efficiency and First Hour Ratings. In addition, it should have low standby loss, thus saving your maximum utility bills.

  • High Efficiency

  • Glass-Lined Steel Tank

  • Low NOx Burner

  • Electronic Gas Control

Lochinvar Residential Water Heaters heats the water with a natural gas input of 40000 BTU/H. It has a vent size of 3 to 4 inches. Lochinvar Water Heater prices 40 Gallon is low and affordable compared to other top rated gas water heaters 40 gallon. However, the Lochinvar Residential Water Heater featured with an electronic gas control and low NOx burner. This Electric Water Heater 40 Gallon has a flammable vapor ignition resistant. Make sure to refer lochinvar water heater reviews, before you choose one. 





The water heater consisting of advanced features, and the latest technologies decide the best hot water heater. There are specific parameters to be considered while purchasing the water heater. This includes the efficiency of the water heater, its durability, installation, and storage space. A brief knowledge about the water heater, I have mentioned the overall description of the key factors.

Most of the 40 Gallon Gas Hot Water Heater uses natural gas to heat the water in the tank. The natural gas water heaters are most cost-efficient, which offers more excellent performance. Yes, you don’t have to worry about 40 gallon water heater cost, its minimal and budget friendly. All the best 40 Gallon Hot Water Heaters meet the energy efficiency standards put forth by NACEA. Energy-efficient Electric Hot Water Heater saves your utility bills and hence reduces your maximum expenses. However, the efficiency ratings may vary with different types of water heaters.

You need to have a large capacity water heater that fulfills your various requirements. Because having a water heater that doesn’t meet your minimum requirements doesn’t make any sense. Probably, a 40 Gallon Water Heater Gas best suits the family of four members. While choosing a particular capacity water heater, you need to make sure that it meets your budget or costings.

40 Gal Gas Water Heater, which uses natural gas fuels, emits nitrogen oxide pollutants. However, 40 Gallon Electric Hot Water Heater meets NOx standards and produces low emissions into the air.

Electric Water Heater 40 Gallon should have a maximum flow rate and recovery rate. The flow rate of 40 Gallon Water Heater Electric measured in Gallons Per Minute (GPM). Consequently, Instant Hot Water Heater should quickly produce heated water at the outlets. However, the water heaters with high flow rates are preferable to high demands of hot water. The recovery rate of 40 Gal Gas Water Heater should be higher. Since the water heaters with low recovery rate supply you cold water at the initial start of the shower. As a result, the Electric Water Heater must equip with a higher flow and recovery rate, which offers you an excellent performance of the water heater.

Electric Water Heater 40 Gal is somewhat tricky to install and requires ample space for installation. However, you must ensure that the licensed technical person installs a 40 Gallon Water Heater. 40gal Water Heater is a large storage tank and requires a large space to install the water heater. Hence, you must make sure that the water heater stored in a prescribed space before the purchase of the water heater. Also, the warranty services are applicable if the water heater installed properly and by the technician. You can refer to the Gas Water Heater Manual for the detailed description of the installation process.

Best gas water heater 40 gallon decided based on the First Hour Rating of the water heater. The FHR calculated when water in the storage tank gets heated and produces the desired temperature of hot water. The amount of hot water supplied at the outlets within one hour is termed as First Hour Ratings.


How much are 40 Gallon Water Heaters?

 40 Gallon Water Heaters usually ranges from $320-$1,600.

What are the most efficient 40-Gallon Water Heaters?

Ecosmart ECO 36 36kw 240V Tankless Water Heater and Excel Pro Tankless Gas Water Heater are the most efficient 40 Gallon Water Heaters.

How many BTU is a 40 Gallon Water Heater?

 A 40 Gallon Water Heater has 34,000 BTU.

How long can you shower with a 40 Gallon Water Heater?

You can shower longer than 5 to 7 minutes with a 40 Gallon Water Heater.

How long does it take to install a 40 Gallon Hot Water Heater?

 It takes nearly 1 to 1½ hours to install a 40 Gallon Hot Water Heater.

Hot Water Heater 40 Gallon best suitable for a typical family of four to five members. The 40 Gallon Water Heater designed in the most innovative way and with the latest technologies. You need to analyze and pick up a Best 40 Gallon Electric Water Heater Reviews which meets your desired requirements. A Hot Water Heater with high efficiency, higher flow, and the recovery rate are most preferable. I assume, the above-explained features helps you in choosing the Best Water Heater for your home.

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