40 Gallon Water Heaters | Best Residential Water Heaters

40 gallon water heater reviews

When you have kids and older people at home, don’t think that depending upon some drowsy water heater would sort it all for you.  Those old water heaters with below-average per minute water supply and constant leakages are already out of the question.

It is high time you should plan and reap the advantages of newer technology and get improvised home improvement appliances. And when it comes to the un-interrupted supply of warm water, a good and reliable heater with intelligible instruction is unavoidable.

On average, the 40 gallon water heaters support a family of 3-4 people throughout the day, and that too while keeping the energy budget in place. I have done detailed research to assist you in getting the best residential 40 gallon water heater so that you don’t have to wait before taking a long warm shower.

Keep reading, and you’d get the best 40-gallon residential water heater reviews, an intelligible buying guide, and some dos and don’ts of water heaters.

So, let’s dive in without any mayhem!

The 6 Best 40 Gallon Water Heater Reviews

1. Rheem PROG40-38N RH59 40 Gallon Gas Water Heater

Rheem PROG40-38N RH59 Gas Water HeaterThis Rheem 40 gallon water heater is specifically designed to meet the needs of every household where water consumption is nonstop.

Either your kids love to spend time in the bathtub filled with warm water, or you have to wash loads of dishes after every meal, Rheem PROG40-38N will assist you everywhere.

Its ecofriendly burner consumes a very tiny amount of gas but still keeps the warm water supply un-interrupted. You might already know that fuel emissions are damaging our environment. With this Rheem 40 gallon gas heater, the emission would never upset the ecosystem.

The anode rods incorporated in this 40 gallon gas heater ensure that the tank lasts long enough so that you don’t have to run in search of plumbers.

Its valves are made up of brass which enhances water flow in the hose and prevents the possibility of water dripping.

Rheem always takes pride in the quality and durability of their water heaters; this PROG40-38N water heater will prove to be a permanent end of your home’s water problems.

Most cheap models use lead in the heating element of heaters which is harmful to skin and environment simultaneously. However, Rheem has maintained the lowest proportion of lead in this heater to protect you from chemicals in all possible ways.

Although Rheem PROG40-38N is expensive when compared to its competitors, the steady water supply it provides indicates that each penny you spend on this heater is worth it.


  • Eco-friendly burner
  • Low gas emissions
  • Anode rods for long-lasting tank protection
  • Brass valve for enhanced flow
  • Minimal lead compliant
  • Easy installation
  • Flexible water attachment lines
  • Expensive


2. A.O. Smith GCR-40 ProMax Plus High Efficiency 40 Gallon Gas Water Heater

A.O. Smith GCR-40 ProMax Plus High Efficiency 40 Gallon Gas Water HeaterGlass-lined water heaters are always well-admired as they’re well-insulated and corrosion-free. A.O smith never compromises on the quality and practicality of their products, the same goes for GCR-40 ProMax water heater.

This sturdy, compact, and inexpensive water heater should be your ultimate choice if you’ve got a family to look after and don’t have much time on your hands.

This 40 gallon gas water heater has a Dynaclean diffuser tip which prevents sediment build-up in its bottom section. As the heating material keeps rotating the water, sediment starts to accumulate in the bottom section, which affects the heater’s capacity in the long run.

The glass lining keeps it corrosion free and ensures there’s no rust on your heater.

A.O Smith has made this heater as per the standards of NAECA (National appliance energy conservation act) which means this heater is safe and you shouldn’t frazzle because of the gas combustion any longer.
Keeping the home improvement fixtures inexpensive and ergonomic has always been a plus point for A.O smith; this heater will let you forget all worries of cold water.

The vent duct attached to GCR-40 ProMax can vent up to 40ft. So that you can install this heater inside the house and not worry about the exhaust pipe’s length.

  • Blue diamond glass coating
  • Corrosion-resistant exterior
  • Made from sturdy material
  • Dynaclean diffuser dip repels lime build-up
  • Manufactured as per the standard of NAECA
  • Can vent up to 40ft.
  • Inexpensive
  • Heavy
  • Requires regular maintenance


3. Bradford White 40 Gallon Natural Gas Water Heater

Bradford White 40 Gallon Natural Gas Water HeaterBeing one of America’s oldest HVAC industries, Bradford White has a loyal base of customers from across the globe. They not only produce reliable appliances but also keep them up-to-the-par and aesthetically pleasant.

This 40-gallon gas water heater has a built-in igniter which starts heating the water quickly after you turn the flame on. The internal thermopile uses the heat produced by a flame underneath the heater to turn the valves on which indicates no electricity connection is needed to operate this heater.

When the pilot of this heater is on, a green LED light will keep you informed so that you can turn the flame off timely.

Its resettable microprocessor allows you to set temperature as per your household needs, and when the temperatures rise above that level, the microprocessor stops working.

This is a very lightweight and compact model that you can install quickly right after you bring it home.

The ten years warranty you get with it shows that your money is in safe hands and if there is any problem in the future, Bradford White will get you covered.

Continuous supply of warm water without worrying about the always-rising fuel costs is nothing less than a crock of gold in this era of chaos. So, if you want a compact and functional water heater for your home, look no further than this Bradford White 40 gallon gas heater.

  • Built-in igniter
  • Microprocessor to maintain a steady temperature
  • No upkeep required
  • Ten years warranty
  • Easy to install
  • Lightweight
  • Continuous supply of water
  • Doesn’t last longer than five years
  • Several complaints of troublesome warranty reclamation recorded


4. Westinghouse 40 Gal. 4500-Watt Lifetime Residential Electric Water Heater

Westinghouse 40 Gal. 4500-Watt Lifetime Residential Electric Water HeaterHaving a history of more than 100 years, Westinghouse would never let you down. Entrust them with your money, and you’d get your appliances from the best lot.

This 40 gal water heater consumes electricity and provides an uninterrupted water supply without getting overheated. Once you give yourself a treat in the form of this heater, you’d be amazed by its efficacy and practicality.

The Westinghouse 40 gallon heater directs water to heating material in the bottom quickly and saves thermal energy up to 98% percent.

Sediment and lime accumulation is a common problem in those heaters which are used extensively. However, because of its laser waded tank, sediment build-up won’t be a problem for you.

You’d get ten years warranty with this lightweight and compact heater. No more worries of dripping hose because this stainless steel water heater is made to assist you in all possible ways.

Despite being electricity-driven, this heater won’t cost you an arm and a leg!

  • Made from durable stainless steel
  • Corrosion-resistant
  • Prevents sediment build-up
  • Adjustable thermostat
  • 98% thermal efficiency
  • Ten years of limited lifetime warranty
  • Very lightweight and convenient
  • Leakages reported
  • Doesn’t last long
  • Heating material starts fading with time

5. Reliance 6 40 DOLS 40 Gallon Electric Water Heater

Reliance 6 40 DOLS 40 Gallon Electric Water HeaterThinly insulated heaters cannot keep the water warm for long enough, every time you need water, you’d have to turn on the heater. But luckily, reliance has made this heater thickly insulated so that water remains warm inside it.

Its glass lining keeps the corrosion at bay and lets you enjoy pleasantly warm water 24×7.
Dual 4500 watt heating material is used in this heater which proves that you won’t have to switch heaters very often.

  • Glass-lined tank
  • Electric water heater
  • Factory-installed T&P valves
  • Dual 4500 watt heating elements
  • Saves energy
  • Thick insulation to keep the heat trapped in
  • Tripping reported by several customers

6. Noritz EZTR40NG 40 gallon Tank Replacement Indoor Tankless Water Heater

The Noritz Oritz EZTR40NG 40 gal Tankless Water Heater is designed to install indoors. It has an intrigued yet compact design, therefore takes up less space.Noritz EZTR40NG 40 gal Tank Replacement Indoor Tankless Water Heater
It is known to be a super high-efficiency water heater with low nox that heats up unlimited ounces of water instantly. You get a water flow of 6.6 GPM with this Noritz heater.
Additionally, the water heater is also equipped with plumbing, a valve kit, and polypropylene venting. It also features K-Copper heat exchangers. The remote control can be bought separately with the Noritz water heater for added convenience.
It is due to these advance features that Noritz EZTR40NG is comparatively heavy on the pocket. So, if you are willing to pay a little extra, then you can go for this one.


  • Compact design
  • Unlimited hot water
  • A water flow of 6.6 GPM
  • Known to have high-efficiency
  • K-copper heat exchanged included
  • Could be operated with a remote


  • Requires a drain
  • Requires steady gas pressure
  • Remote control not included in the purchase
  • Slightly costly

40 Gallon Water Heater Buying Guide

If this is your first time purchasing a water heater, there are ample chances that you’d end up with an expensive yet problematic heater. Even if you grab a good deal, the repairing and maintenance cost might leave a big hole in your pocket.

Moreover, buying a reliable heater is no easy play; you better be ready to do some brainstorming, compare products, and evaluate their features. But, fret not! I have made this water heater buying checklist after thorough research. Keep these points in mind, and you’d never face any trouble while getting a new water heater.

1. Capacity

Everything becomes useless if your water heater does not support your daily water needs. Having a family means continuous use of water in the kitchen, laundry, and showers.

If you are 2-3 people at home, a water heater with 20-30 gallon capacity would serve you needs effortlessly. Similarly, if you are a family of 3-5 people, your heater must have the least capacity of 40 gallons. Most water heaters offer above 60 gallons of water during the first hour of consumption, and this capacity reduces as the hours pass by. 40 gallon water heaters are the most practical and easy-to-use ones for residential use.

2. Warranty

Home improvement fixtures are pricy, period. Once you decide to replace something as important as a water heater, make sure it’s all worth it.

The confident manufacturers always offer a reasonable warranty with their heaters. Your new water heater should have a minimum warranty of 5 years. Rheem, Reliance, Westinghouse, Bradford, and A.O smith are some of the most trusted brands that offer a far-reaching warranty on all products.

Before spending your precious bucks on a heater, do check its warranty and repairing policy.

3. Material

There are many cheap water heaters in the market available at low costs. Although they look appealing in the beginning, they soon start showing their true colors. Plastic heaters begin to drip, and their outer core gets cracks with time.

Fortunately, most reliable heater manufacturers don’t use plastic lining in heaters. Instead, stainless steel, brass, and glass linings have now replaced plastic altogether.

Additionally, stainless steel and brass material provides better insulation and keep the heat confined inside the heater. This way, you can keep the water warm for extended periods and maintain the heater’s unharmed outer surface simultaneously.

4. Fuel type

Mainly two types of fuel are used to heat water in residential dwellings, i.e., electricity and propane/natural gas. The type of heater you get depends upon the fuel available in your home.

If the power outage is a routine in your home, forget about the electricity supported heater. Similarly, if you live in a frigid place where natural gas gets frozen inside the pipes, electricity would be your savior.

In terms of cost, electricity has the upper hand. Electricity consuming water heaters will keep your bill under control. Gas, on the other hand, is relatively expensive but lasts longer when compared to an equal amount of electricity.

5. Installation and maintenance

Unlike the tankless water heaters, the 40 gallon water heaters are pretty hard to install. You’ll have to call a plumber for installing a new heater. However, some heaters are easy-to-install, while others take more time and effort.

If you are constructing a new house, installation shouldn’t be a problem as you might incorporate two separate pipelines for warm and cold water. But, if your home doesn’t have two pipes already, go for a heater that doesn’t require extensive drilling and wading through the walls.

If you are a busy soul who is always running errands, go for a durable heater that won’t ask for regular upkeep. The stainless steel based heaters do not leak very often and are reliable.

6. Accessories

Water heaters are an essential part of every home. We all use warm water in the bathroom, wash the dishes, and do laundry. So, if warm water is such an important part of your daily routine, why don’t you buy a smart heater which saves your time and effort?
These days, heaters come with various useful accessories such as alarms, heater pans, and stands.

Although these accessories do not affect the amount of warm water a heater produces per hour, they still play a vital role to keep the heating process effortless.

The alarm installed in some heaters starts wailing when the temperature rises above a certain level or when the water starts overflowing. A heater pan is a simple yet useful accessory which collects the dripping water and keeps your house’s floor dry.
Moreover, the digital display meters which come with many heaters are helpful to keep a record of the amount of water used and its temperature. Cutting the long story short, be smart, buy smartly. The accessories will surely make this process painless and practical for you.


A water heater is a necessity; you cannot live without it when the water in your storage tank is icy. If you want to enjoy the winters in peace, get a reliable water heater and throw the worries of energy bills out of the window.

I hope your queries about the best 40 gallon residential water heaters would’ve been answered by now. The takeaway of this article is to invest money in useful appliances and enjoy the chilly weather without any apprehensions. Cheers!




Fuel Type

Storage Capacity


20" x 20" x 50"

130 pounds


40 gallon



22" x 22" x 58.5"

165 pounds


40 gallon



20" x 20" x 60.5"

134 Pounds


40 gallon



54.2 x 19.5" x 54.2"

104 pounds


40 gallon



20" x 20" x 60.5"

134 Pounds


40 gallon



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