Best Tankless Water Heater in 2021 – Top 6 Models Reviewed!

Do you like having hot water whenever you want? Well, a tankless water heater is what you need. That is why it is also called an instantaneous or a demand-type heater. Get to enjoy showering, soaking in your tub, and cleaning dishes.

The appliance does not feature a storage tank. It heats water on demand providing 2-3 gallons each minute. As an alternative to a tank heater, it is durable, energy-saving, and requires a small space for installation.

Now, as you plan to order heaters, it is crucial that you purchase the best tankless water heaters. They guarantee you efficiency and satisfactory performance.

In addition, you must be equipped with information and details about different water heaters out here and their features. With information on what makes the best water heater can be able to make an informed decision.

This is because there are different tankless water you will come across and it can be challenging to decide for someone buying it for the first time. In this piece, we are going to look at the top 6 tankless water heaters that you can choose from.

Best Tankless Water Heater Reviews – 2021

1. Bosch 2.5-Gallon Electric Mini-Tank Water Heate

Bosch is a credible brand when it comes to home gadgets. In its range of products, there is the Bosch electric tankless water heater. It offers users a 2.5-gallon mini-tank. However, you can still use it as a tankless heater.

This product is small and you can install it in your suitable tinny place. It fits in the tiniest corners under the sink or in your bathroom. As long as you have a 120V power outlet, you are good to go with this device. It features a long power cord for easy plugging and maneuverability.

Bosch Tronic 2.5-Gallon Electric Mini-Tank Water Heater

The mini-tank is glass-lined to ensure long-term use and proper insulation to prevent heat loss. The heater itself has quick recovery time. It eliminates delays in you getting hot water.

Using the external dial, you are able to regulate the heater’s temperature. This way you have the freedom to determine how hot you want your water. The pressure valve and temperature valve foster your safety as you operate the appliance.

If you like attractive products, Bosch looks spectacular in any space. It has a simple design making it easy to USG.


  • Easy plugging and maneuverability
  • simple design making it easy to USG
  • Quality for Long-Life
  • Great for Small Spaces
  • Simply tap into the cold water line


  • Only having access to cold water from a sink
  • Looking to small size

2. EcoSmart ECO 27 Electric Tankless Water Heater

EcoSmart ECO 27 is the definition of an elegant, best tankless electric water heater. From its color combos to the design, it is worth the price tag. The model uses a digital temperature control that is highly adjustable. With 1 degree increments, you can regulate the water temperature to a setting of your liking.

About material, this device incorporates stainless components, brass tops, and copper. They increase high performance, long-lasting use, and easy maintenance and replacement. Despite it being compact, it is also large but saves on space.

EcoSmart Electric Tankless Heater

Remember, this brand operates on a 240volts outlet. Its self-modulating technology is a huge add-on, as it controls the energy used in heating water. It will help you cut your energy bill by half. The heater has a high flow rate to suit usage that is more demanding.

The automatic resettable thermostat promotes easy usability and flexibility. This product weighs ft pounds only and has a UL and GSA certification. It works perfectly in cold places and climates whose water temperatures can be as low as degrees.

You have no excuse of using freezing water during winter or cold mornings when you have EcoSmart. It is stylish, big, eye-catching, and encompasses advanced tech.


  • It increases high performance
  • Long-lasting use for long life
  • Easy maintenance and replacement
  • Saving you up to 50% in water heating costs


  • Only use the amount of energy needed

3. Stiebel Eltron Tempra 24 Plus Tankless Electric Water Heater

Like EcoSmart, Stiebel offers the self-modulating characteristic. It is reliable and uses a digital control for temperatures. The display allows you to know the temperature setting your press. This gadget does not need any venting mechanism; therefore, it increases convenience and lowers installation costs.

Stiebel Eltron Water Heater-Tempra Series

The brand will assist you to cut hot water energy costs by 15-20%. Do not worry about design because the heater looks fantastic anywhere. It uses improved tech, which includes heavy-duty components, a single flow sensor, easy access hinged cover, and advanced flow control.

The flow control guarantees a constant temperature at all times. Thus, there are no temperature fluctuations no matter the demand for hot water. Enjoy that nerve-wracking bath with consistent hot water temperature. The sensor uses a simple design for extra user-friendliness.


  • Uses a simple design for extra user-friendliness
  • Saves energy with auto-modulation
  • Digital temperature display
  • The world leader in hot water technology


  • It only uses as much energy as the need to reach the setpoint
  • Showers always stay hot

4. Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

This model is among the Rinna’s tankless highest class and excellent tankless gas water heater ultra-range that they make designed for heavy work.

According to the information given by the manufacturer, this system of water heater can cope with houses with four bathrooms that need hot water. So, if you are looking for a water heater for a large family that can cope with heavy work, this is a good choice for you.

Rinnai RUC98iN Ultra Series Natural Gas Tankless Water Heater

You will also find that this model is efficient and safe. As I have mentioned earlier, this model is also energy efficient with between 95% to 98% efficiency, something that is fantastic for a tankless natural gas water heater. In average, it has around 96% energy efficiency which is the best efficiency that you can find in water heaters of its kind.

This product is also scale resistant for those of us who live in places where there is hard water. It a built-in enhanced scale protection to safeguard it from the effects posed by hard water.

This unit is on the higher end of its cost, but its features as described above are worth it. Rinnai is proud because they are the only outstanding water heater manufacturers to design two installation options all in one unit.

The two installation unit saves you the hassles of buying the extra parts. This model provides you with two natural gas venting options that are PVC pipe and concentric pipe options both on top of the unit for convenience in access in installation.


  • It occupies minimal space
  • It is energy efficient with a rating of 96% Provides continues hot water flow
  • Able to provide continues hot water flow to multiple showers and faucets.


  • It is very expensive
  • It is bulky and difficult to install

5. Eccotemp L10 2.6 GPM Portable Tankless Water Heater

The Eccotemp L10 is lightweight, compact and easy to carry. This makes it great for off-grid use, camping, and outdoor showers as well as for washing your pets. Apart from the portability, this product has a rugged design that enables it to handle a permanent outdoor installation like on the back of summer for more than three months.

Not so many water heater models can be able to handle such an extended stay. With this tank, you are guaranteed of continuous instant hot water supply.

Eccotemp L10 Portable Outdoor Tankless Water Heater

This water heater model has a CSA power regulator which works with 20 lb. standard propane tank. This unit features a battery igniter eliminating the need for electricity. It uses 20 battery cells to power the igniter. It comes with a garden hose adapter as well as the stainless rain cap.

For safety, the eccotemp L10 has a twenty minutes automatic safety shutdown timer as well as a manual temperatures controller. The unit is designed in a way that it can provide a 2.6 gallons per minute flow rate with a 3V voltage and 20kw heat input rate.


  • Quick activation
  • Easy to set up and start using
  • Can be used both outdoors and indoors
  • It can be installed outdoor permanently


  • It is very expensive
  • Can experience flow delays
  • The heating box is heavier than the other models

6. Takagi T-KJr2-IN-NG Indoor Tankless Water Heater

This tankless water heater from Takagi is among the highest rated water heaters that you will find on the market at the moment. It is affordable for most people making it possible for those working on a tight budget to get a long-lasting, high-quality tankless water heater.

This model is one the ideal and small sized water heaters on the market in terms of getting a long-lasting product as well as great for the home.

Takagi T-KJr2-IN-NG Indoor Tankless Water Heater

In addition, this model is smaller in comparison to other tankless water heaters you will find in the world making it possible to place it almost everywhere. It is ideal for cottages, condos, and homes and it can comfortably supply hot water continuously in two bathrooms simultaneously.

When it comes to performance, there are very few tankless water heater models that can battle Takagi T-KJr2-IN-NG. This is because most of the capabilities that 40-gallon tankless water heaters have can also be found in this small unit.


  • Great price worthwhile for home and office
  • It has DIP switches fitted for greater efficiency
  • Easy maintenance and installation


  • Can’t be effective for large homes

How To Choose The Best Tankless Water Heaters

Tankless water heaters have taken the world by storm due to their efficiency in comparison to their traditional water heaters that rely on a storage tank. Not only that they are more energy efficient, but they are also economical over time and saves on space.

For those people who are living in an area with limited space, a tankless water heater would be the right choice. Whatever it might be your reasons for buying a water heater without storage, it is essential to check the features first and check which one meets your needs.

If you looking to purchase a tankless water heater, you will need to do your homework and make a note of what a good water heater comprises.

Now you have an idea about the best tankless water heater to buy. However, there are essential pointers to keep in mind when purchasing water heaters.


Go for products with heavy, durable material. They will last for a while before they require replacement. Look at the components of the item you wish to purchase. Stainless products have the sparkle you need to liven your space. Buy a heater that looks elegant to complement your decor.


The bigger the tankless heater, the better it is for producing hot water even when in high demand. There are compact, large brands that take up little space in your horn. However, if you do not have a high demand for hot water, you can buy small versions. They will work just fine.


There are electric and gas operated tankless heaters. It all depends on your fuel preference. Nonetheless, gas heaters have a higher flow rate as compared to the electric types. The availability of fuel is also important when choosing water heaters.

Advantages of Tankless Water Heaters

Tankless water heaters were invented to eliminate hot water storage tanks. However, they have a lot more to offer. For instance, they take up less space than tank heaters. They have a higher flow rate. It does not matter how many tasks in your home need hot water to be it dishwashing, laundry, bathroom or kitchen.

There is no need to worry about a tank running out of hot water. Tankless heaters provide hot water on demand or instantaneously. When you need it, you get it.

These heaters last longer and have a high flow rate. Do not forget how they cut on energy because they consume less of it. The best tankless water heater offers admirable features.

After considering the material, size, and fuel a product uses, you should compare different brands from different manufacturers. Apart from the top six reviews, the market has other products that could be excellent for you.

As long as you know the features to look out for, you are in a better position of buying a useful heater for your home and commercial use.

You do not want to use cold water just because a storage tank is empty. It is clear that a tankless heater has much to offer users. What remains is you identifying items that suit your needs.

Bottom Line

To wrap up the loose ends, it is worth considering your water needs and balance it with the price consideration while deciding on the water heater to purchase.

The main benefit of the water heaters discussed above that are tankless is that the built-in advanced technology gives you exactly what everyone has been looking for.

That is a perfect and continuous supply of water that won’t turn cold in the middle while bathing. They eliminate the challenge of waiting for a hot water tank refill in the traditional water heaters something that used to be time-consuming and cumbersome.

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