The Ultimate Guide to Buy Under Sink Water Heaters 2020

There will be no doubt in the statement if we say that tankless water heaters are very thin and compact and they are specially designed to save the space.

But if you are looking for the better option then you should take a look at Under Sink water heaters.

As the name suggests, these water heaters are specially designed so that they could fit under sinks, counters, or inside the bathroom closet. But that’s not enough of their benefits, that’s only like one drop of the entire ocean.

Under sink, water heaters save the extra cost of installation as they are very easy to install and you don’t need long pipelines. They can be installed on walls and can also be settled on the floor.

They save a lot from heating cost and the main thing is that as they are installed near the water outlet so you don’t have to wait for even a second for hot water.

But again, there are many different models of under sink water heaters provided by various companies and it’s very difficult to choose one. But don’t worry, again we are here to guide you for the better than best.

Here is the list of top best Under Sink water heaters to satisfy your requirement

1. Stiebel Eltron Mini 3 Water Heater

  • Compact and thin designs.
  • Energy and cost-efficient.
  • Very easy to install.
  • A very Reliable brand.
  • There is no need for venting.
  • Water flow is limited.

Are you looking for an energy saving under sink water heater then hold on and have a look on Stiebel Eltron mini 3 Water Heater.

Stiebel is a German Technology and this under sink unit is specially designed to save the energy but not only this, Stiebel Eltron mini 3 water heater comes with a pre wired pig tail that makes its installation very easy, so it is not only energy saving  but cost saving as well.

This elegant water heater has a very user-friendly interface and can be easily installed at the point of use. If you install this unit then you don’t have to worry about stand by heat losses as Stiebel Eltron mini 3 water heater eliminates it properly.

This water heater can be commonly seen in offices, malls, hospitals, modern kitchens, and many other places. But what makes it stand tall among others under sink water heaters? Is it its elegant design? Or compact size? Or its easy installation procedure?

Well, these are also the advantages of this unit but the efficiency of this unit is the feature that is always ready to steal the show.

Yes, Stiebel Eltron mini 3 water heater is 99% energy efficient. Also, this unit doesn’t require any venting or pressurized pump or any drain which makes it cost-efficient as well. And other than this Stiebel is a trusted brand so there will be no questions about the reliability of Stiebel Eltron mini 3 under sink water heater.

2. Bosch ES 2.5 Under Sink Water Heater

  • Capacity of 2.7 gallons.
  • Easy to install.
  • 94% thermal efficient.
  • Graceful Italian design
  • Reliable brand.
  • Can be mounted on walls and floor as well.
  • Glass lined tank ensures the long service
  • Child safety is limited

Bosch ES 2.5 under sink water heater is a mini but mighty tank water heater. This water heater holds a capacity of 2.7 gallons. As Bosch ES 2.5 Water heater is an electric unit so it is way more easier to install it.

Other than that Bosch is the most trusted and reputed brand of Water heaters, so you will not face any trouble regarding the reliability of this water heater.

Just with the entry in market bosch made its reputation high by fulfilling the requirements of many household of America. It has compact design and it is lightweight as well. So you will not face any problem during its installation.

But what makes it extraordinary? Well as you can see in the picture it is its phenomenal design from outside and glass-lined internal look that makes it so much special. With the blink of an eye, you will find this unit installed under your sink as it is very easy to install.

Not only its amazing Italian design this water heater is also 94% thermal efficient. So if you are getting good looks and amazing features in the same unit then why go further. Just take a seat and enjoy the working of this amazing under sink water heater.

3. Atmor Tankless Water Heater

  • It provides endless supply of hot water on demand.
  • It is quite energy efficient
  • Very Eco friendly
  • There is no need of venting that makes its installation one step easier.
  • Atmore electric tankless water heater comes with an Elegant and classy design
  • There is no feature of plug in

A Water heater being both under sink and tankless at the same time is an amazing combination, isn’t it? It won’t be a lie if we say that the Atmor tankless water heater is an amazing innovation that has left many customers and other water heater brands jaw dropped.

This tankless water heater provides the unlimited supply of hot water on demand. Not only this but the Atmor tankless water heater is also very efficient and ecofriendly and its auto activation features adds more sparkle to its elegance.

In the recent years many customers have installed this tankless water heater in their households, all thanks to its compact and slim design  that helps it to be in a modern kitchen and bathroom.

Talking about its working, Atmor electric tankless water heater need dedicated single phase breaker of 30 amp to run properly. Unlike other water heaters, Atmor electric tankless water heater saves upto 50% of the total cost on water heating.

Another benefit of the Atmor electric tankless water heater is that there is no need of venting that makes it installation easier.

4. Ariston GL4S water heater

  • It comes with a very compact size.
  • Very easy to install an almost effortless installation procedure.
  • Small but mighty.
  • It Comes with 4 gallons of the mini tank.
  • Last longer.
  • Very user-friendly interface.
  • The thermostat setup is very time-consuming.

The main reason why most of the owners are replacing their water heaters is they are not long-lasting but these kind of complaints are very less in the case of Ariston GL4S water heater.

This under sink water heater is long-lasting. The Ariston GL4S electric water heater comes with a mini tank that holds the capacity of 4 gallons.

These water heaters provide the hot water supply at an instant without any delay. They have very user-friendly interface and not only this, the installation process of Ariston GL4S electric water heater is almost effortless because there is no hard wiring.

It is also very flexible you can adjust it in a closet or can also mount it on the wall. The new model of Ariston is better than the former model because the old model has a knob to operate and the new model comes with a thermostat to adjust the temperature of outlet water, which makes it more convenient and user friendly.

What else you need other than a water heater with a compact size, needs only 12.5 amp to operate and hold the capacity of 4 gallons. All you need is to plug it into a 120-volt outlet and then just enjoy its working.

5. Waiwela WM 2.5 Mini Tank Water Heater

  • Easy to install in a closet.
  • Instant hot water supply.
  • Comes with a power cord.
  • Enhaced durability due to glass lined tank.
  • Protection against overheating
  • You need to be careful in case of temperature adjustments.

Waiwela step into the market with its phenomenal Waiwela WM 2.5 mini-tank water heater. But what makes this water heater secure its place in this list is its rich quality material and amazing manufacturing techniques.

This water heater provides the instant supply of hot water without any wastage of water that’s also the reason why most of the customers are preferring this unit.

This water heater is very flexible you can mount it on the floor or on the wall as per your convenience. But what is the main reason that helped Waiwela WM 2.5 mini tank water heater secured its position in this list?

It is all because of the adjustable thermostat that prevents it from overheating. As it comes with a glass-lined tank that helps to enhance its durability as well. It provides the hot water supply instantly without any delay at the point of use.

The problem that water heater owners mainly face is the early damaging of their water heater but with this unit, you don’t have to pay attention on problems like this.

It has a very friendly user interface. Also, it comes with an attached power cord that makes it easier to run. The Waiwell WM 2.5 water heater comes in different capacities like it can hold water upto 6 gallons, small in size, lightweight, classy design, specially designed for rest room and many more.

6. Ariston GL 2.5 Mini Tank Water Heater

  • Easy to install.
  • Durable glass-lined tank.
  • Can work independently as well as with other water heaters.
  • Ultra-compact in size.
  • Energy-efficient.
  • Only 120-volt outlet is needed to operate.
  • High maintenance is required.

Ariston GL 2.5 mini tank water heater made the entry in the market just like a superhero with its advanced technology.

It is manufactured to hold the capacity of 2.5 gallons of hot water, it is also very lightweight. The Ariston GL 2.5 mini tank water heater is becoming very popular among users as its size fits properly with modern kitchens and restrooms.

Although all under sink water heaters are compact in size but when we tank about Ariston GL 2.5 mini tank water heater then no one can even stand in front of it, as its super compact design helps it to fit anywhere in the closet or on walls.

It’s outer look is very attractive and if we talk about inner side then it comes with a glass-lined tank that makes it more stronger and durable. The main plus point of this under sink water heater is that before stepping into the market each unit undergoes high-end insulation that makes it even more efficient.

But what makes it different from other under sink water heates? That is its capability to work independently as well as with any other water heater. Also, it just need a 120-volt outlet to operate and it doesn’t consume more than 1500 watts.

7. Bosch PowerStar AE 9.5 Electric Water Heater

  • The high volume of water
  • Easy installation process
  • Compact in size.
  • High thermal efficiency
  • Less stand by loss
  • No need for maintenance
  • Fluctuations in the temperature of outlet water may occur.
  • There is no temperature adjustments button.

Bosch PowerStar AE 9.5 electric water heater is 99% thermal efficient and also provides the endless supply of hot water at the point of use.

It is very easy to install, you can install it vertically or horizontally as per your convenience. It requires 220 to 240 volts of outlet to operate.

It is also very lightweight as compared to other under sink water heater. Bosch power star AE 9.5 electric water heater is specially designed to give the high volume of hot water at the point of use.

The thermal efficiency of this under sink water heater results in a minimum stand by loss. How can we wrap up this conversation without mentioning the main advantage of Bosch PowerStar AE 9.5 water heater that is it needs no maintenance. So your maintenance cost is also saved.


Many households are preferring under sink water heaters for their modern kitchen or bathroom but there are some aspects that you need to consider before buying an under sink water heater.

Like efficiency, power source, maintenance requirements, energy ratings, tank capacity, and safety features. And after checking all aspects just buy the water heater of your choice and enjoy the show.

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