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The 8 Best 40 gallon hot water heaters of 2024

Are you trying to find 40 gallon hot water heaters among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling 40 gallon hot water heaters on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 20 hours of research and did 27 40 gallon hot water heaters tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best 40 gallon hot water heaters you can buy today

No. 1
Rheem 72-40-2 240V / 4500W 40 Gallon Electric Water Heater
  • Rheemglas lined tank
  • R-Foam insulation
  • Anode Rod protects against corrosion
  • Automatic temperature control thermostat
  • Direct immersion heating element
No. 2
Rheem PROE40 T2 RH95 40-Gallon Professional Classic Water Heater; Dual 4500-Watt Heating Elements; 240VAC; Automatic Thermostat; Over-temperature Protector; Temperature and Pressure Valve Included
  • 40 Gal. tank provides ample hot water for households with 2 people to 4 people
  • Electric water heater is easy to maintain
  • Delivers 55 Gal. of hot water in the first hour
  • Requires a 240-Volt connection for installation
  • 0.93 uniform energy factor signifies an energy efficient water heater
  • Dual 4500-Watt heating elements
  • Automatic thermostat keeps water at your desired temperature
No. 3
State Proline Series 40 Gallon Capacity 4.5 kW Heating Input Tall Electric Water Heater
  • 53 Gallons per Hour First Hour Rating
  • 0.92 Uniform Energy Factor Rating
  • 21 Gallons per Hour Recovery at 90°F Rise
  • Dimensions: 61-1/4" H x 18" D
No. 4
Rheem 18kW 240V Tankless Electric Water Heater, Gray
  • External digital thermostatic control with LED display (+/1 degree accuracy)
  • Most advanced self-modulation, adjust power to meet hot water demand
  • Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
  • Simple installation – bottom 3/4 inch NPT water connections
  • Threaded for easy replacement, simple installation, digital temperature display
No. 5
GE Smart 30 Gallon Short Electric Water Heater with Built-In Wifi | 30 Gallon | 240 Volt | Stainless Steel, Gray (GE30S12BLM)
  • Real Capacity - Get the most hot showers from the only electric hot water heaters that holds a true 30 gallons of water
  • Built-in WiFi - Easily adjust temperatures, set vacation mode schedules, and receive notifications with Built-in WiFi powered by SmartHQ
  • Leading Performance - Live comfortable with this best in class unit that delivers 60 gallons of hot water in the first hour (Measured through DOE First Hour Rating)
  • Quick Recovery - Two 5500W stainless steelheating elements quickly increase water temperature for hot water when you need it
  • Anode Sensing - Notifies you when your anode rod needs replacing to help extned the life of your tank
SaleNo. 6
Mizudo Natural Gas Tankless Water Heater 3.6 GPM, 80,000 BTU Indoor Installation Instant Hot Water heater
  • 【Instant Hot Water Heater】Tankless water heaters can provide endless hot water on demand for 2- 3 water points.
  • 【Comfortable Bathing Experience】3.6 GPM hot water flow, precise temperature control, no water temperature sandwich.
  • 【Premium design and Durable】Adopt oxygen-free copper water tank, reduce heat loss, high efficiency and durability.
  • 【Compact Design】Save over 50% of available space compared to tank water heater.
  • 【Quality Service】If you encounter product quality problems, you can contact us by phone, email and message, and we will provide service according to the warranty policy.
SaleNo. 7
GE APPLIANCES Point of Use Water Heater | Electric Water Heater with Adjustable Thermostat & Drain Valve | 10 Gallon | 120 Volt | Stainless Steel, Gray (GE10P08BAR)
  • POINT OF USE WATER HEATER - Installs on-location for hot water where you need it
  • COMPACT DESIGN - Ideal in limited spaces like kitchens, bathrooms, laundry rooms, cabins, RVs, garages, sheds, etc
  • EASY INSTALLATION - Uses standard 3/4-in NPT water connections and connects into any 120-Volt supply for simple installation
  • HOT WATER BOOSTER - Works as a standalone unit, or inline with another water heater to boost long pipe runs or washing machines
  • ADJUSTABLE THERMOSTAT - Easily change temperatures to your desired settings
No. 8
Tankless Water Heater Natural Gas,4.74GPM 18L Indoor,Instant Hot Gas Water Heater,Constant Natural Water Heater with Fahrenheit Digital Display,Multi-Protection (Black)
  • 【Tankless Water Heater】- Natural Gas water heater tankless Steady Steady Temperature Control with more safety protection such as flame failure device,anti-freezing protection,over heating protection,Just need 3.6PSI of water pressure,4.74gallons of hot water can be output per minute.The maximum temperature raise is 167°F,Applicable only Natural Gas(LNG)
  • 【Efficient & Energey Saving】-The 4.74 GPM Instant Natural Gas Water Heater ,Maximum power output 68000btu/hour,on-demand hot water for 2-3 points simultaneous water supply for bathroom,kitchen hot water demand,Natural Gas Water Heater exchanger and main burner are desinged with advanced combustion technology to decrease gas consumption and burning noise.
  • 【Quality Material】-This of ours Water Heater Crafted from stainless steel, our Propane water heater exhibits high temperature resistance and corrosion resistance. It also features a built-in oxygen-free copper water tank, reduce heat loss ensuring a prolonged service life.with with LED smartdigital display effortlessly adjust the temperature between 86°F-167°F according to your preferences.
  • 【Easy Assemble and Use】-Applied with standard 1/2" NPT water fitting and gas inlet, comes with 2.5" horizontal vent pipe for quick installation.Note: For normal operation, this product must be installed with proper ventilation and a smoke exhaust pipe.
  • 【Widely Application 】-Save over 50% of available space compared to tank water heater.for both bathroom and kitchen hot water demand. great for home,small cabins and remote apartments indoor installation. without the need to install an expansion tank,Note: In cold weather, if the water heater is not used for a long time, it is necessary to open the pressure relief valve to drain the residual water in the water heater.
SaleNo. 9
FOGATTI Natural Gas Tankless Water Heater, Indoor 5.1 GPM, 120,000 BTU Instant Hot Water Heater, InstaGas Classic 120 Series
  • 【Smaller size and better performance】It is only 1/4 the size of a 50 gallon tank water heater, yet it produces approximately 5.1 GPM of hot water through 120,000 BTU for both bathroom and kitchen hot water demand. The highly integrated components also provide greater safety from water pressure surges without the need to install an expansion tank.
  • 【Fast and endless supply of hot water】The heat exchanger quickly heats the water to a maximum of 149℉ in a short time, and the hot water is quickly piped through to the shower and tap. No need to wait for the water temperature to heat up slowly like a tank water heater. After that it continues to operate at approximately 5.1 GPM for 40 minutes, which is enough time to produce almost 200 gallons of hot water.
  • 【Stable and comfortable temperature】Benefiting from the calculation and control of the heating power 1000/s by the chip, the temperature difference of the water can be precisely controlled within ±2°F.
  • 【High compatibility and easy installation】Most tank water heaters have exhaust vent, water and gas pipe that can be universally used in tankless, requiring only a simple re-layout. If installing a tankless water heater in a new house, its compact size makes it easy to install. Of course, we recommend that all installations are carried out in accordance with local building and plumbing codes by licensed professionals.
  • 【Excellent quality and service】CSA certification in the USA and Canada. Superior safety and durability using the world's most advanced technology. FOGATTI provide 5 years warranty on heat exchanger and 2 years warranty on other parts.
  • 【Note】1. Not recommended in excess of 2000 feet above sea level. 2. This tankless gas water heater must be installed in a well-ventilated area. 3. Requires additional purchase of 3-inch diameter exhaust pipe.
SaleNo. 10
WINTEMP Tankless Water Heater Electric 27KW 240V, Suitable for Whole - House Hot Water Supply, Self - Regulating On - Demand Hot Water Wigital Temperature Display WIFI Control WN27
34 Consomer Reviews
WINTEMP Tankless Water Heater Electric 27KW 240V, Suitable for Whole - House Hot Water Supply, Self - Regulating On - Demand Hot Water Wigital Temperature Display WIFI Control WN27
  • 【Endless Hot Water】- WINTEMP Tankless Electric Water Heater - Provides a continuous supply of hot water in a short time, with instant hot water at 125℉ available within seconds. No need to wait for preheating, no more worries about running out of hot water in the tank, and no temperature fluctuations during showers.
  • 【Energy Saving】- Self-modulating temperature technology adjusts power input based on real-time flow rate and temperature settings. When water flow decreases, the system reduces power consumption, achieving energy savings and helping you cut heating costs.
  • 【Easy Installation】- This wall-mounted water heater is perfect for saving space and can be installed anywhere. Dimensions: 19.1 inches x 4 inches x 11.1inches, with a standard 3/4-inch interface (inflow or outflow), equipped with remote WIFI control, allowing temperature control without the need to be near the water heater.
  • 【Safe to Use】- Safety is always WINTEMP top priority. It comes with overheat protection, dry-heating protection, and electrical leakage protection to ensure your safety, allowing you to enjoy hot water anytime, anywhere with peace of mind. It is ETL certified and meets UL standards.
  • 【Important Note】- For the WN 27kW Electric Tankless Water Heater, the maximum power current is 113 amps. You will need to have access to 240 volts, 3 sets of 40-amp circuit breakers, and 3 pieces of 8AWG wires. To ensure safety, please make sure to check your breaker panel before installation to confirm that it meets these specifications.
  • 【Support】- WINTEMP offers a 1-year parts warranty and 1-year technical support. If you encounter any issues during usage, you can follow these steps: Order - Seller - Answer your questions.

How to choose a good 40 gallon hot water heaters

Does the idea of finding a fantastic 40 gallon hot water heaters make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in 40 gallon hot water heaters. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top 40 gallon hot water heaters products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top 40 gallon hot water heaters on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top 40 gallon hot water heaters brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top 40 gallon hot water heaters based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the 40 gallon hot water heaters were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good 40 gallon hot water heaters, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your 40 gallon hot water heaters.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting 40 gallon hot water heaters for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our 40 gallon hot water heaters. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what 40 gallon hot water heaters should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on 40 gallon hot water heaters.