Best Residential Water Heater Reviews 2021

Are you tired of water wastage in your home? Are you looking for the best residential water heater? Innovations have led to the emergence of new products to meet our needs.

Purchasing a water heater is one and important long-term investments. Therefore, making a wrong decision while making the purchase would mean a disaster for your days to come.

There are quite a number of water heaters in the market today. You need to choose the best water heater that will give run for your money. Here are some important factors to consider:

Performance: You need to have a water heater that has multiple points of application e.g laundry, dishwasher running etc.

Energy efficiency: Your choice of model should be fuel efficient. It should save your money

Durability: The best model should have a low rate of wear and tear in order to give you a longer service time.

Size of the water tank: Your usage will determine your tank size. Hot water should be enough to cater for the household

1. Rheem RTGH-95DVLN 9.5 GPM Tankless Gas Water Heater

Tankless Water Heate

This stands out to be the best-selling tankless gas water heater in the market. This is due to its high levels of energy efficiency, which may not be found with any other product of a kind.

The manufacturers have designed it with unique and intelligent controls. This is to ensure 100% safety and a high level of efficiency.

The EZ-link is available, which enables you to use it commercially by connecting two tankless units if you want. This link makes it possible to join two models and make it work as a single unit.

If you have significant attitude issues, you need not worry. Rheem RTGH-95DVLN tankless water heater has high altitude capability. It functions pretty well up to 9.84 ft, above the sea level.

Various industry standards have been cross-checked against the Rheem model. Professionals have certified the heating and cooling options over and over again.

This is to guarantee quality, reliability, and customer satisfaction. This makes it one of the best tankless water heater to go for.


  • Very high energy efficiency
  • Electric controls that are easy to use
  • High quality guaranteed by third-party labs tests
  • Ideal for large households as it produces 9.5 gallons per minute.
  • It can be installed anywhere in the house as it is safe


  • It is among the most expensive tankless water heaters
  • High professionalism is required in maintenance and repair
  • For small homes, it may be needlessly powerful

2. TAKAGI TH3OSLP Tankless Water Heater

Tankless Water Heater

If you need a compact size water heater for your home, this is the most ideal one. It presents fantastic perfection for use in small apartments that make use of the radiant heating application.

This model has inlet and outlet thermistors, which ensure that the temperature is well monitored to ensure consistency.

This model has a maximum flow rate of 6.6 GPM of water, which ensures a steady water supply. Unlike other models, there is no limitation of the water heating system due to the delay of the water flow.

The heating unit supply line has a capacity similar to that of 40 gallons. This guarantees you high efficiency and maximum performance.

This model is fitted with heat exchanger compassion and venting systems, which ensures safety whenever you are using it. This model has a well-regulated power consumption.

It has a 0.81-0.83 energy factor, which makes it stand out to be one of the most popular models. If you are looking for a model with the most desirable features, this is the model to consider.


  • Its size is convenient
  • It is cheap and affordable
  • Its flow rate is consistent
  • Has advanced switches for easy operations
  • Numerous features that guarantee the safety


  • Installation is expensive
  • Not suitable for a big family
  • High professionalism is required in maintenance and repair

3. Ecosmart ECO 18 Electric Tankless Water Heater

Water Heater

If you are looking for the new generation tankless water heater, then, here it is. Eco 18 has some smart features that you would find hard to turn away from. It has a self-modulating technology that enables to be energy efficient by saving 60% of energy consumption.

This model presents you with endless hot water supply as water passes through the unit, unlike other models that store hot water. This model can heat two sinks and showers at the same time and a sink and a shower all at once in cold climates. 

This heater comes to you with a cosmetically pleasing appearance. Its design makes your washroom look attractive where you can take pictures showing how an eco 18 tankless heater can give your home a beautiful look that everyone would wish for.

This is among the top-rated water heaters that should cross your mind if you need efficiency and smooth operation.


  • Its installation is easy
  • Accurate temperature controls
  • Very much affordable
  • It can be installed anywhere
  • Reduced electric consumption as compared to other heaters


  • May need more than one unit
  • Unsuitable for large homes
  • Unsuitable for cold climates

4. Ariston Andris 4 Gallon 6 Year 120-Volt Corded Point of Use Mini-Tank Electric Water Heater

Electric Water Heater

Are you looking for a mini-tank water heater that uses electrical energy? Ariston GL4S is the ideal mini-tank heater.

This model has upgraded thermostat for which allows more precise and a hot water supply that is consistent. You will have the easy accessibility of the temperature adjusting knobs.

It has a compact design that will perfectly fit in your small to medium size kitchen. This model requires no hard wiring. All that is needed is a standard outlet of 15A, and you will be ready to use it.

It has a pressure relief valve that will ensure that you have a perfect flow of hot water to your satisfaction.

Ariston GL4S has been fitted with standard 1.5-inch fittings that compatible with many plumbing fixtures. It runs on electricity, thus making it safer for you to use as compared to other water heating systems running on propane.


  • Less time of heating up 4 gallons of water
  • Saves energy and water consumption
  • Quiet operations
  • Its installation is easy
  • Uses electrical energy


  • May not be suitable for some households due to less Water supplied
  • High professionalism is required in maintenance and repair
  • Requires plumbing skills

5. Stiebel Eltron 224199 240V, 1 Phase, 50/60 Hz, 24 kW Tempra 24 Plus Whole House Tankless Electric Water Heater

Electric Water Heater

If you’ve been asking yourself which is the most technically advanced water heater in the market, then by reading this, you’ll get the right answer. Stiebel Eltron 224199 240V, 1 Phase is a more sophisticated and oldest tankless water heater in the market.

It has Tempra Advanced Temperatures Control, which makes it possible to maintain the stability of the heat at a given time.

If you have the dial at your fingertips, it is possible to adjust the temperature of the hot water at any given time.

It has a single flow sensor design and advances flow control that ensures that the flow of water is adequately regulated.

This model saves energy by consuming 15% to 20% less energy when compared to a conventional electric tank water heater.

This is because there is no standby heat loss as there will be no hot water is stored to be used later. You have to believe that this model will suit your needs.


  • High accuracy of water temperatures
  • Precise and constant water flow
  • Has a compact design and it is well designed
  • Saves a lot of energy
  • The capability of handling two fixtures at a time i.e Showers and sink


  • Installation may be complicated as it requires more electrical work
  • Requires a lot of power to starts working i.e. not less than 60 amp
  • High professionalism is required in maintenance and repair

6. Rinnai RUC98iN Ultra Series Natural Gas

Water Heater

This is one of the most technologically attractive water heaters that may offer you a solution to your indoor usage. This model has a flow rate of 9.8 gallons, thus providing you a good supply of hot water. It serves more than one outlet at a time.

More venting options are available with this unit, unlike other tankless water heaters where they are absent. This unit is almost noiseless due to its advanced venting system. This will make it possible for you to install it in the laundry or bathroom.

This model has an energy factor of 0.98, which means it is energy efficient. Running on natural gas makes it more effective due to the production of high heat capacity meaning the cost of running is reduced as compared to electric run water heaters.

To reduce water wastage in your home, consider installing the Rinnai RUC98iN Ultra Series Natural Gas model.


  • No interruption in supplying hot water to multiple taps
  • Emission of carbon dioxide is low
  • Economical and efficient with an energy factor of 0.96
  • Saves space
  • Suitable for both residential and commercial homes


  • Its installations are very sensitive or intricate
  • Relatively expensive
  • High level of professionalism required in repairing and maintenance

Things to Consider When Selecting Best Residential Water Heaters

For you to make a right and informed decision before having a water heater in your home, you need to have ample information regarding various models of water heaters in the market.

Here are some of the most important things to consider while deciding on the best residential water heater.

Energy Efficiency

Some of the earlier models have large tanks where the system works by heating the water at once. Heating stops after the water is hot to specific temperatures. After some time, the water will lose warmth, and the water will be repeated.

This is an example of a method that may be expensive as compared to some of the modern models i.e., tankless water heaters that are more energy-efficient as water is only heated when it is required.

Energy consumption is an essential aspect to consider. Tankless models will have the energy costs cut down.

Availability of Space

This is another aspect that you need to consider when choosing the type of residential water heater to install. When installing the water heaters, adequate space Is required to fit the large storage tanks.

On the other hand, the tankless water heaters may not require as much space as those with shells. This is because their size is compact, and only a little space is needed for the setup.

Warranty and Durability

Commonly, a warrant is given one you purchase a particular product. Likewise, the water heaters have permits different from each other based on the manufacturer. It is therefore essential you consider the water heater with the most extended warranty period.

This guarantees that the product is of good quality and its durability is excellent. You should review the strength of the tank water heater as it is subject to wear and tear. Various studies have shown that tankless water heaters have a longer life than conventional heaters.

Storage Capacity

When choosing a water heating system, storage capacity is an important aspect to consider. The size of the household usage would dictate this. If the household usage is high, it means that a traditional tank heater may is appropriate.

On the other hand, if the household usage is low, then a tankless water heater may be considered as it produces only a few liters of hot water.


After considering all the other aspects, your budget comes as the ultimate determinant as to what you are going to settle for. It is essential to purchasing a water heater that will offer you the value of your investment. This will be helpful to you in making a final decision on what to go for.

These are some of the most important factors that should influence your decision. Your decision should be centered on the number of factors.

This would give the convenience of purchasing the water heater. With this guide, you can now proceed to buy the best residential water heater that will suit your needs.

Final verdict

In my view, the Rheem RTGH-95DVLN 9.5 GPM model stands out as one of the best water heaters compared to all. This model has well-designed features that make it unique from the rest. Rheem has a variety of applications.

The most important feature is the advanced digital display that helps you to set and maintain temperatures at a specific point. This element is hard to get from conventional models, as well as the modern ones.

This model is straightforward for you to use that even if you don’t have any technical knowledge, you would not have any difficulty using it. A recent study has shown that out of 10 water heaters, 4 are Rheem RTGH-95DVLN 9.5 GPM.

Its popularity is increasing day by day due to its efficiency and effectiveness. For the best experience, you need to consider purchasing this model.

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