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8 Best Under Sink Water Heater Reviews in 2022


Warm water is very helpful, especially in your kitchen sink where you would wash dishes or other utensils. But, it is not always available with a sink since the tap of the sink is not connected to a dedicated water heater. If you wish to change that, you should take a look at an under sink water heater. These are small and compact types of water heaters that you can install in a compact space, such as the cabinet below your sink.

Hence, the name “under sink water heater”. You can also find some options with a dedicated tank, but the overall capacity of the tank will be low. Since these heaters don’t have to heat up a lot of water at once, you can get warm water in your sink within minutes after turning these hearts on. Here are some important characteristics of an under sink water heater that you should check before you decide to buy one.

  • Size: The size of the water heater should always be checked before you buy one. For tank water heaters, it represents the water capacity that could be stored in the tank and heated at once. For tankless options, it is basically the flow rate of the water that you can get while heating up the water continuously. For example, if you are going with a 3.1 gallons tankless water heater, it will offer you about 3.1 gallons of warm water every minute.
  • Water Pressure: The water pressure requirement is different for different tasks. If you are using the sink for basic applications, then you probably don’t need a lot of water pressure. For such an application, a water heater with a 115 PSI water pressure rating would do the job. But if you are using the tap water for washing larger appliances or watering plants a bit far away from the sink, then the water pressure should be higher, about 150 PSI at least.
  • Temperature Range: The temperature range of an under sink water heater tells you about the temperature up to which it can heat up the water. In this range, the lower number indicates the minimum temperature level of water available at your tap whereas the larger number indicates the maximum temperature level. Usually, it is better to go with an under sink water heater since it offers a versatile range of applications.

If you are not sure how to pick up a decent under sink water heater or wondering which options are perfect for your budget, you have come to the right place. Here, we have created a helpful list of the best under sink water heaters available on the market right now. Along with that, we have also included the detailed specifications of each of our picks as well as their pros and cons. This information will certainly come in handy while you are making a choice. To help you even further, we also have a Buying Guide for the best under sink water heaters ready for you right after our picks.

Best Under Sink Water Heater 2022

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Best Under Sink Water Heater Reviews

1. EcoSmart ECO 11 Electric Tankless Water Heater

EcoSmart ECO

EcoSmart is one of the most famous brands that comes to mind for home accessories, especially water heaters. This brand designs a variety of water heaters for pools, spas, whole-home applications, and even under sink options.

Our first pick for this list of the best under sink water heaters is the EcoSmart ECO 11. This is probably the best tankless heater you could find to install in a cabinet under your sink since it measures only 3.75 x 8 x 11.5 inches in size. Still, it manages to deliver about 3.1 gallons of warm water every minute which is more than enough for basic applications. Plus, you will get a temperature range of 80 to 140°F with EcoSmart ECO 11.

With the given size, the EcoSmart ECO 11 is nearly 90% smaller compared to traditional tank-type water heaters. On top of that, this machine is also nearly 99% more efficient in terms of thermal energy consumption which is a big deal. It is powered by a 13 KW heating system which will be perfect for bathrooms, sinks, office kitchens, and many other similar applications. You can also adjust the water flow between 1.3 to 3.1 gallons per minute as per your demands.

Best Features

  • It measures about 3.75 x 8 x 11.5 inches in size
  • It offers 3.1 gallons size
  • Offers a temperature range of 80 to 140°F

Pros

  • One of the most compact options
  • Offers great water flow with high temperature
  • Powered by a 13 KW heating system

Cons

  • A bit more expensive than other options

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2. Bosch Electric Mini-Tank Water Heater

Bosch Electric Mini-Tank Water Heater

If water heater size is an important factor for you, you should go with a tank-type water heater. But so is the installation size since you are looking for one to install under a sink. Therefore, we are introducing this mini-tank water heater from Bosch Thermotechnology.

Usually, tank-type water hearts are quite large and are not suitable for compact installation spaces. But, Bosch Thermotechnology has managed to bring a perfect option to bridge the gap between these 2 types, the Bosch Tronic 3000 Bosch Electric Water Heater. Despite being a tank-type option, it measures only 13.75 x 13.5 x 13.75 inches in size, making it suitable for compact installation spaces. And, you will still get a 4 gallons built-in tank on the Bosch Tronic 3000 Bosch Electric Water Heater to suffice for your warm water needs.

The thermal efficiency of the Bosch Tronic 3000 Bosch Electric Water Heater is about 98%. So, it can offer you hot water on demand without being heavy on your pocket. Plus, it also has premium glass-lined material on the inside, extending its lifespan for quite a long time. Since this is a tank-type water heater, you can even connect 2 sinks with the same unit without worrying about the water flow rate.

Best Features

  • It measures about 13.75 x 13.5 x 13.75 inches in size
  • It offers 4 gallons size
  • Offers a temperature range of 65 to 145°F
  • Can be used with 2 sinks simultaneously

Pros

  • Compact option along with a 4 gallons tank
  • Easy to install or mount on a shelf, wall, or floor with floor mounting brackets
  • Built-in pressure relief valve to improve its safety rating

Cons

  • It does not have a digital display

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3. EcoTouch Tankless Water Heater

EcoTouch Tankless Water Heater

EcoTouch is also a brand that mainly deals with water heaters and other similar equipment. The most attractive point of water heaters designed by EcoTouch is their stylish design paired with a versatile range of applications.

In the 3rd position, we are bringing the EcoTouch Tankless Water Heater. Unlike most other options that you can find for a tankless water heater, the EcoTouch Tankless Water Heater measures only ‎15.25 x 11.2 x 4.9 inches in size, making it a very attractive option in terms of design. It also features a compact digital display that indicates the current water temperature that you can manually adjust from the control options provided right below the display panel.

The EcoTouch Tankless Water Heater is powered by a 5.5 KW heating system, offering a temperature range of 67 to 116°F with sufficient water flow capacity. As you can adjust the water temperature yourself, you will get about 98% energy efficiency on the EcoTouch Tankless Water Heater which is quite high compared to other choices. The electrical circuit and water pipelines inside the EcoTouch Tankless Water Heater are mounted separately to avoid any electrical anomaly caused by leakage. This design is also approved by ETL and it qualifies for UL, assuring its safety.

Best Features

  • It measures about ‎15.25 x 11.2 x 4.9 inches in size
  • Approved by ETL and qualifies for UL
  • Offers a temperature range of 67 to 116°F
  • Powered by a 5.5 KW heating system

Pros

  • Offers about 98% energy efficiency
  • Safe, durable, and attractive design
  • Digital display with touch control on the water heater

Cons

  • Maximum heating temperature is lower than other options

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4. Camplux ME25 Mini Tank Electric Water Heater

Camplux ME25 Mini Tank

Camplux is a brand that usually manufactures accessories that you would find beneficial for indoor as well as outdoor applications. As for water heaters, this brand manufactures both gas water heaters as well as electrical water heaters.

The Camplux ME25 Electric Water Heater is yet another mini-tank water heater that we are including on this list. This unit features a capacity of 2.5 gallons which might be suitable if your requirements aren’t that high. As for the size, the Camplux ME25 Electric Water Heater measures nearly 11.75 x 10.38 x 14.5 inches in size, making it perfect for compact spaces. To increase its service life, Camplux has also provided a glass-lined tank on the inside of the Camplux ME25 Electric Water Heater.

When it comes to safety, the Camplux ME25 Electric Water Heater does not leave any boxes unchecked. It has a thermostat that allows manual adjustment of water temperature so that you can always be sure about using the water coming out of your tap and its temperature. It also features UL approval which is essential for home appliances. There is also a built-in safety feature on the Camplux ME25 Electric Water Heater that prevents overheating of the water and in turn, the problems caused by overheating.

Best Features

  • It measures about 11.75 x 10.38 x 14.5 inches in size
  • It offers 2.5 gallons size
  • Offers a temperature range of 50 to 140°F
  • UL approved design

Pros

  • Great build quality and service life
  • Manual control for water temperature adjustment
  • Comes with a year of warranty

Cons

  • Tank capacity might be too low for some users

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5. BISELONG 110V-120V Electric Tank Heater

BISELONG

If you are looking for a tank-type water heater under an affordable price range, the following option from BISELONG might be worth checking out. BISELONG is also a brand that primarily focuses on water heaters along with many other essential home accessories.

The BISELONG Electric Water Heater is yet another compact option we found for a tank-type water heater. This unit has a 14.57 x 13.7 x 13.31 inches footprint and still offers a 2.5 gallons built-in water tank. Thus, you can easily install this water heater adjacent to the primary water pipelines of your sink. Along with the water heater, you will also receive stainless steel water hoses, a vent valve, and a 16 inches long FIP.

Other than that, there are multiple safety protections installed in the BISELONG Electric Water Heater to protect the unit from problems like scald, leakage, or other design faults. Even though this is a tank-type water heater, you can get on-demand hot water from this water heater thanks to its automatic heat preservation system. The BISELONG Electric Water Heater offers a maximum of 149°F water temperature which should be sufficient for most applications.

Best Features

  • It measures about 14.57 x 13.7 x 13.31 inches in size
  • It offers 2.5 gallons size
  • Offers a temperature range of up to 149°F
  • Offers 98% thermal efficiency

Pros

  • Built-in smart chip to retain water temperature
  • Can be used for 2 sinks simultaneously
  • Pretty cheap option for a tank-type water heater

Cons

  • Takes 8 to 15 minute to warm up the water

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6. Thermoflow Corded Electric Mini Tank Water Heater

Thermoflow Corded Electric

Thermoflow is also bringing a compact yet powerful option for an under sink water heater. If you are looking for a tankless option, you can also find that on Thermoflow’s product page.

Up next, we have one more mini tank-type water heater coming from Thermoflow. The Thermoflow Mini Tank Water Heater is a great option in terms of design since this unit offers a German design. This water heater will offer you an adjustable water temperature between 45 to 167°F which is pretty high compared to many other options. The Thermoflow Mini Tank Water Heater also has an advanced thermostop technology that reduces energy loss.

While we are talking about safety, the Thermoflow Mini Tank Water Heater also includes an EPS foaming technology that ensures proper insulation and avoids leakage problems. Other safety circuits on the Thermoflow Mini Tank Water Heater include overheating protection, auto cut-off, IPX24 water resistance, and much more. So, the Thermoflow Mini Tank Water Heater will be the right choice for your office, home, RV, and other similar applications.

Best Features

  • It measures about 18 x 11 x 12.2 inches in size
  • It offers 2.5 gallons size
  • Offers a temperature range of 45 to 167°F
  • EPS foaming technology for better insulation

Pros

  • Advanced thermostop technology for energy efficiency
  • It has IPX24 water resistance
  • Stainless steel tank

Cons

  • Larger in terms of height

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7. Eccotemp EM-2.5 Electric Mini Tank Water Heater

Eccotemp EM-2.5 Electric

Eccotemp has also lined up a great option for a mini tank heater on our list that grants you many features within a very affordable price range.

The Eccotemp Mini Tank Water Heater is also a similar tank-type option for water like the ones we have seen so far. It offers a 2.5 gallons water tank built-in within the unit, which itself measures about 14.75 x 11 x 13.25 inches in size. Therefore, fitting the unit below your sink would not be a problem. The adjustable temperature range of the Eccotemp Mini Tank Water Heater ranges between 50 to 140°F, so you can get the desired output temperature from the unit.

The Eccotemp Mini Tank Water Heater also includes a temperature and pressure relief valve to ensure the safety of the user as well as the device in the event of overheating or overuse. You will be able to mount this water heater on the wall or even on the floor with the help of mounting brackets included with the heater. The Eccotemp Mini Tank Water Heater has a recovery time ranging between 25 to 45 minutes which depends upon your usage.

Best Features

  • It measures about 14.75 x 11 x 13.25 inches in size
  • It offers 2.5 gallons size
  • Offers a temperature range of 50 to 140°F
  • Comes with a built-in temperature and pressure relief valve.

Pros

  • Compact design and easy to install
  • Comes with mounting brackets
  • Adjustable temperature range

Cons

  • Recovery period might be too long

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8. Agust Electric Hot Water Heater

Agust Electric Hot Water Heater

If you still haven’t found the right option for an under sink water heater in your budget so far, the following option from Agust is right for you. This is also a budget-friendly option for a mini-tank water heater.

In the end, we are bringing one more budget-friendly option for an under sink tank-type water heater. The Agust Electric Hot Water Heater is the best option for home applications since it operates on 110 to 120 volts input. Plus, it is also a compact unit with 3 gallons capacity that resolves the installation problem for a lot of users. The Agust Electric Hot Water Heater is made up of stainless steel so you will never have to worry about problems like rust or corrosion even after frequent water contact.

Despite the low price range, the Agust Electric Hot Water Heater offers the highest water temperature option up to 167°F which is missing from even the premium options. Since this is a tank-type water heater, it can suffice for 2 sinks at a time without any problem. Plus, it can get the inlet water ready to use within 8 to 15 minutes after you turn the unit ON. Unlike most other options, the Agust Electric Hot Water Heater also features a digital display to easily acknowledge the status of the water heater.

Best Features

  • Easy-to-operate knob for temperature adjustment
  • It offers 3 gallons size
  • Offers a temperature range of up to 167°F
  • It has a digital display

Pros

  • Can be used for 2 sinks at a time
  • Tank size is comparatively larger
  • Water is ready to use within 8 to 15 minutes based on temperature level

Cons

  • Comparatively larger than many other options

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Buying Guide For The Best Under Sink Water Heater

If you want a compact and energy-efficient option for warm water, an under sink water heater will be the perfect pick for you. These options are perfect for small applications, whether we are talking about domestic applications or commercial installations. If you compare these options with conventional water heaters, you will notice that under sink water heaters are usually tankless and consume significantly less space as well as energy to operate. You will also come across a wide range of options, varying in terms of basic specifications such as water flow capacity, heating capacity, and water pressure.

So if you want to pick up the perfect option for your home or office, you need to carefully check these parameters before you make your choice. For a lot of new buyers, these specifications are usually confusing and lead to a lot of confusion while they are trying to pick up an option. So, we are here to make your job easier with our buying guide for the best under sink water heater. In this guide, we will talk about some important features of an under sink water heater that you should carefully check before making a choice.

1. Type of Under Sink Water Heater

Before you look for an under sink water heater, you should first decide what type of water heater will benefit you the most under your budget. Usually, a lot of users seem to be confused between tank-type and tankless water heaters. Since these are the most popular options for a water heater, we will tell you some important advantages and limitations of both options. In the case of a tank-type water heater, the water heater comes with a dedicated tank that stores the water and heats it up to use it whenever needed.

It eliminates the limitations on water flow level since you can use the stored warm water as per your needs. Also, it lets you supply water to multiple taps around your house with proper piping. However, these options use more energy since they have to heat up a lot of water at once. Also, you will have to wait for quite some time before you get warm water from your tap. On the other hand, tankless water heaters are the most popular option in the market right now as they offer instantaneous results. Also, these options are highly compact and easy to install for compact spaces.

2. Size and Capacity

If you have decided what type of under sink water heater is better for you, it is time to look at its specifications and performance. For both cases, you will have to check the size and overall capacity of the water heater to ensure it is compatible with your needs. For instance, a tank-type water heater might offer you a variable water flow rate, but if its storage capacity is low, you won’t get a lot of warm water even after waiting for quite a while and you will have to use the water heater frequently, utilizing more energy than ever. The same goes for tankless water heaters. Instead of the tank capacity, the size of the heater in this case represents the flow of water available from the water heaters per minute. Even if you find a highly compact option that is suitable for the cabinet under your sink, it won’t be an ideal choice if the available water pressure or flow rate isn’t suitable for your application.

3. Energy Rating

While most water heaters can offer you warm water at a desirable temperature level, not all of them will be the right choice when it comes to running costs. As you may already know, traditional water heaters used to include a metal coil on the inside which was used to heat up the water. As you can imagine, it required a lot of energy to operate and the bills at the end of every month were not pretty. Even though there have been a lot of upgrades in the design of the water heaters ever since, the running costs of some options are still quite high.

Therefore, the brands that do manage to get the running cost to an affordable level go with an energy star rating for their product. If you don’t already know, the energy star rating is a rating given to water heaters based on their performance compared to the energy consumption. So, the water heater that offers comparatively better performance within the same energy consumption gets a higher energy star rating. If you also decide to go with an under sink water heater with a high energy star rating, you can rest assured that your monthly energy bills won’t be shocking.

4. Safety Features

Apart from installation compatibility and powerful specifications, an under sink water heater should also come with basic safety features to offer a safe and secure installation. Since water and electricity are already a deadly combination, it is a very important feature for an under sink water heater. For starters, there should be a built-in thermostat to maintain the temperature levels and ensure it does not exceed the design limit of the heater. Also, there should be a pressure relief valve that reduces excess pressure developed inside the tank or pipes of the water heater to avoid any unfortunate incident.

Some under sink water heaters also include a modulation unit that automatically controls the flow of water according to the set temperature level. Some advanced options for an under sink water heater also include a digital display that indicates if there is a problem with the heater and whether it needs a repair or not. While you are at it, also make sure that the unit you are buying has a warranty period or not. If you get one with a long warranty period, you can use the unit without worrying about the quality of the components installed in it.

FAQs

Q. What should be the distance between an under sink water heater and the tap?

If you desire a faster output from the under sink water heater, it would be beneficial to keep the under sink water heater as close to the tap as possible. In general, the heater should not be more than six feet away from the tap itself. If the distance between the tap and the heater increases, the heat loss also increases due to added travel distance. Therefore, you may not receive warm water as per your expectations, especially if you are using a tankless water heater.

Q. Is it difficult to install an under sink water heater?

Unlike traditional water heaters, it is pretty easy to install new water heaters since they are already pretty compact and come with all necessary accessories included in the package. If we are discussing under sink water heaters, you can probably install this unit by yourself without needing any professional help. You can also find instructional videos and tutorials on the manufacturer’s website regarding the same. With that being said, we will still recommend getting professional help if you are getting a tankless water heater since it has to be hardwired.

Q. Are under sink water tables suitable for commercial places?

Since a high water flow is needed in commercial places like cafes and restaurants, an under sink water heater might not be the ideal choice for the application. Plus, these places usually rely on instantaneous hot water on a daily basis, throughout the day. Thus, you would have to keep the unit turned ON all the time if you were to install one. But with that being said, these options can still perform optimally in small cafes or food courts with one or two sinks at best.

Conclusion

While there are a lot of water heaters available on the market, there are only a few options that are suitable for compact places, and under sink water heaters are the best options for that. These are small water heaters that can be installed in a compact space, even as small as the cabinet below your sink. Still, they can offer warm water pretty quickly as per your needs. Since there are many different options available for an under sink water heater, you can easily find the one that suits your needs the best in terms of specifications and performance. To help you find that unit, we have gathered a list of the best under sink water heaters right here. If you need help in picking up an option, kindly take a look at our buying guide for the best under sink water heater as well as our top recommendations listed right here.

Tankless water heaters are right now the best option for domestic compact water heaters. And if you are getting an option as good as the ECOTOUCH Tankless Water Heater, you definitely shouldn’t miss that. This option comes with a digital display which is not provided on even some premium options. And, the ECOTOUCH Tankless Water Heater also offers a temperature range of 67 to 109°F which is sufficient for basic applications. This unit is powered by a 5.5 KW heating system which is highly efficient and still offers warm water pretty quickly.

If you think you will need a high-capacity option for your under sink water heater, then the Bosch Electric Mini-Tank Water Heater will be the right choice for you. This is a 4 gallons mini-tank water heater that offers you an ample amount of warm water on demand. This unit is made up of premium glass-lined material which increases its lifespan by quite a long time. Thanks to its large capacity, the Bosch Electric Mini-Tank Water Heater can be used for up to 2 sinks simultaneously without having to wait a long time for warm water.

When discussing feature-rich options, the EcoSmart ECO 11 Electric Tankless Water Heater definitely tops the list for an under sink water heater. This is a rather premium choice for an under sink water heater with a 13 KW heating system pushing up to 3.1 gallons of warm water every minute. Still, it measures about 3.75 x 8 x 11.5 inches only, making it nearly 90% smaller than traditional tank-type water heaters. This unit will offer you a temperature range of 80 to 140°F along with a water flow rate manageable between 1.3 to 3.1 gallons per minute depending on the inlet temperature.



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