Top 10 Best 40 Gallon Water Heater Based On Scores

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Our team studied on 56637 reviews available online for 40 Gallon Water Heater, chose the finest ones and prepared 40 Gallon Water Heater Reviews for you. It was very difficult to shortlist the ideal 40 Gallon Water Heater from thousands of products online. However, We tried to make sure that you get only the Best 40 Gallon Water Heater from our suggestions. Check our listings-:

Best 40 Gallon Water Heater
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Comparison Chart for Best 40 Gallon Water Heater

56637 number of user reviews were available online, which we scanned to find the 40 Gallon Water Heater. Hopefully, our experts suggestions available in this article will help you find your ideal choice.

NoProductScoreAction
1A.O. Smith ENS-40 ProMax Short Electric Water Heater9.8Buy On Amazon
2Noritz EZTR40NG 40 gal Tank Replacement Indoor Tankless Water Heater 6.6 GPM (Standard Vent) - Natural Gas9.8Buy On Amazon
3Rheem RTEX-18 18kW 240V Electric Tankless Water Heater9.8Buy On Amazon
4Stiebel Eltron MegaBoost Tank Booster Water Heater9.4Buy On Amazon
5Noritz EZTR40LP 40 gal Tank Replacement Indoor Tankless Water Heater 6.6 GPM (Standard Vent) - Liquid Propane8.8Buy On Amazon
6EcoSmart ECO 11 Electric Tankless Water Heater8.8Buy On Amazon
7Eemax EEM24013 Electric Tankless Water Heater8.8Buy On Amazon
8Rinnai RL75iN Natural Gas Tankless Hot Water Heater8.6Buy On Amazon
9SRCC Certified 30% Tax Credit & Local Rebate Eligible - Complete System - 40 Gallon Solar Water Heater8.4Buy On Amazon
10Rinnai RU199eP Propane Gas Condensing Tankless Hot Water Heater8.4Buy On Amazon

Table Of Content:

1. A.O. Smith ENS-40 ProMax Short Electric Water Heater

  • Permaglas glass coating protects steel tank from corrosion and maximizes tank life
  • Dynaclean diffuser dip tube helps reduce lime and sediment buildup while maximizing hot water output; made from long-lasting PEX cross-linked polymer.
  • CoreGard anode rode aluminum anode with stainless steel core protects tank against corrosion longer than ordinary steel anodes.
  • Durable, tamper-resistant brass drain valve
  • Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)

2. Noritz EZTR40NG 40 gal Tank Replacement Indoor Tankless Water Heater 6.6 GPM (Standard Vent) – Natural Gas

  • Endless hot water
  • Direct replacement for existing 40 gal tank water heater
  • High Efficiency
  • Low Nox

3. Rheem RTEX-18 18kW 240V Electric Tankless Water Heater

  • 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

4. Stiebel Eltron MegaBoost Tank Booster Water Heater

  • More hot water for more Showers or longer Showers
  • Saves space by making a small tank perform like a large tank
  • Fast & accurate hot water temperature adjustment for convenience and comfort
  • Increases existing tank capacity up to 70%
  • 200% faster recovery time
  • Saves money by preventing the increased standby losses of a larger tank replacement

5. Noritz EZTR40LP 40 gal Tank Replacement Indoor Tankless Water Heater 6.6 GPM (Standard Vent) – Liquid Propane

  • Endless hot water
  • Direct replacement for existing 40 gal tank water heater
  • High Efficiency
  • Low Nox

6. EcoSmart ECO 11 Electric Tankless Water Heater

  • Endless On-Demand Hot Water; Consistent hot water when you need it that never runs out; Continuously monitored water temperature and controlled flow rates ensure efficiency and consistent performance within 1 degree of selected temperature.
  • Save Space; EcoSmart tankless electric water heaters are 90% smaller than traditional tank heaters; may be installed on wall or at point of use; Dimensions 11.
  • Save Energy; EcoSmart tankless electric water heaters are 99% thermal energy efficient; Only heats water when called unlike a tank heater that maintains water temperature even when not being used.
  • EcoSmart ECO 11 Sizing; 13-kilowatt tankless electric water heater ideal for providing hot water for a bathroom, small sink, office breakroom and other point-of-use or low-flow applications; provides between 1.

7. Eemax EEM24013 Electric Tankless Water Heater

  • Tank less water heaters provide a continuous Supply of hot water and only heats the water you need, when you need it.
  • Instant, consistent and endless hot water
  • The most advanced, self-modulating technology available, meaning the unit will adjust how much energy needs to be input based on how much hot water is needed.
  • Compact size saves valuable storage space
  • Before purchase and installation, Please verify that this EEM24013 is the correct size for your hot water needs.

8. Rinnai RL75iN Natural Gas Tankless Hot Water Heater

  • Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary
  • Optimal Water Pressure: High-performance 7.5 GPM hot water flow rate for a powerful, constant stream
  • Instant Heating: Circ-Logic technology enables recirculation patterns that coincide with your typical habits; Wi-Fi monitoring creates hot water on demand.
  • Guaranteed to Last: 12-, 5-, and 1-year residential and 5-, 5-, and 1-year commercial factory warranty for heat exchanger, parts, and labor respectively.

9. SRCC Certified 30% Tax Credit & Local Rebate Eligible – Complete System – 40 Gallon Solar Water Heater

  • 10 year Collector Warranty
  • No Pumps – No Moving Parts – No Glycol
  • Easy Installation for DIY or plumber.
  • High Density Polyurethane Insulation provides excellent heat retention.
  • Ships to the U.S. and Hawaii – contact us for shipping information

10. Rinnai RU199eP Propane Gas Condensing Tankless Hot Water Heater

  • Endless Hot Water: Enjoy unlimited hot water flow throughout the house; compact, durable, and easy to install; professional installation recommended.
  • Energy and Space Efficient: Space-saving design conserves energy as it heats only when necessary
  • Optimal Water Pressure: Up to 11 GPM hot water flow rate for a powerful, constant stream
  • Instant Heating: Equipped with Circ-Logic – Pair with an external pump to reduce wait time for hot water via scheduled or on-demand recirculation.
  • Guaranteed to Last: 15-, 5-, and 1-year residential for heat exchanger, labor, and parts, respectively.

How To Choose The Best 40 Gallon Water Heater

Does the thought of finding a great 40 Gallon Water Heater stress you out? Has your mind been juggling between choices when it comes to buying 40 Gallon Water Heater in general, specifically regarding which model to choose?
If that’s the case, know that you’re not alone. Many people find it tough to buy the perfect 40 Gallon Water Heater for themselves. We understand the stress associated with the buying process!

Since you’re here, you are obviously curious about 40 Gallon Water Heater. You’ve been bombarded with information, so you need to find a reputable source with credible options before you make any decisions on which product would be best for your needs.

There are many sources that’ll provide you with that information- buying guides or ratings websites, word-of-mouth testimonials from friends or family members, online forums where users share their personal experiences, product reviews specifically found all over the internet and YouTube channels. Only thorough research will ensure that you get the right product.

But that’s not always easy, right? That's why we've taken time to compile a list of the best 40 Gallon Water Heater in today's market, on your behalf, so that there will be no more worries for you.

How did we come up with the list, you ask? How did we create this buying guide?

  • First, our algorithms collected as much information available about these products from trusted sources.
  • We employed both Artificial Intelligence and large data volume to validate all collected information.
  • Then our AI ranked them on their quality-to-price ratio using industry-standard criteria that let us pick the best 40 Gallon Water Heater currently on the market!
The products aren’t chosen randomly. We consider several criteria before assembling a list. Some of the criteria are discussed below-

  1. Brand Value: What happens when you go for a not-so-reputable brand just because the price seems cheap? Well, the chance of getting a short-lasting product goes higher. That’s because the renowned brands have a reputation to maintain, others don’t.


Top 40 Gallon Water Heater brands try to offer some unique features that make them stand out in the crowd. Thus hopefully, you’ll find one ideal product or another in our list.

  1. Features: You don’t need heaps of features, but useful ones. We look at the features that matter and choose the top 40 Gallon Water Heater based on that.
  2. Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products of higher specifications, but with the right balance.
  3. Customer Ratings: The hundreds of customers using the 40 Gallon Water Heater before you won’t say wrong, would they? Better ratings mean better service experienced by a good number of people.
  4. Customer Reviews: Like ratings, customer reviews give you actual and trustworthy information, coming from real-world consumers about the 40 Gallon Water Heater they used.
  5. Seller Rank: Now, this is interesting! You don’t just need a good 40 Gallon Water Heater, you need a product that is trendy and growing in sales. It serves two objectives. Firstly, the growing number of users indicates the product is good. Secondly, the manufacturers will hopefully provide better quality and after-sales service because of that growing number.
  6. Value For The Money: They say you get what you pay for. Cheap isn’t always good. But that doesn’t mean splashing tons of money on a flashy but underserving product is good either. We try to measure how much value for the money you can get from your 40 Gallon Water Heater before putting them on the list.
  7. Durability: Durability and reliability go hand to hand. A robust and durable 40 Gallon Water Heater will serve you for months and years to come.
  8. Availability: Products come and go, new products take the place of the old ones. Probably some new features were added, some necessary modifications were done. What’s the point of using a supposedly good 40 Gallon Water Heater if that’s no longer continued by the manufacturer? We try to feature products that are up-to-date and sold by at least one reliable seller, if not several.
  9. Negative Ratings: Yes, we take that into consideration too! When we pick the top rated 40 Gallon Water Heater on the market, the products that got mostly negative ratings get filtered and discarded.
These are the criteria we have chosen our 40 Gallon Water Heater on. Does our process stop there? Heck, no! The most important thing that you should know about us is, we're always updating our website to provide timely and relevant information.

Since reader satisfaction is our utmost priority, we have a final layer of filtration. And that is you, the reader! If you find any 40 Gallon Water Heater featured here Incorrect, irrelevant, not up to the mark, or simply outdated, please let us know. Your feedback is always welcome and we’ll try to promptly correct our list as per your reasonable suggestion.