Are you looking for the best under sink instant water heater? Because we all know those winter days when the last thing you want is having to use freeze water. And gone is the torture of shaking hands under the ice-cold stream of tap water. So, if you’ve got an adequate heating device at your home, then you may want to consider buying an under sink water heater.
Don’t just believe what I say, keep reading this article. And find below our carefully researched list of instant water heaters under sink. They will surely perfectly fit under your kitchen counter, sink, or even in your vehicle as well. Moreover, to help you make a good decision, use our buying guide to understand what makes an excellent under sink water heater.
Also, read our latest guide about Best commercial water heaters
Best under Sink Instant Hot Water Heaters in 2020
So, if you’re looking for under sink water heater for dishwasher, then you’re going to love this post. Because in this post, we’ve reviewed the best under sink water heaters including their features, performance, user reviews, pros, and cons.
IMAGE PRODUCT DETAILS 
Stiebel Eltron 2332 Check Price 
Eccotemp EM-2.5 Check Price 
WaiWela WM-2.5 Check Price 
Precision Temp RV-550 Check Price 
Thermoflow UT10 Check Price 
Eco-Smart 8KW Check Price
1- Stiebel Eltron 2332 – under sink tankless water heater 120v
If you’re looking for an effective & small tankless water heater, then this Stieble is perfect for you. It comes with 2.5 Gallons waster capacity which makes it one of the most appealing choices in the market right now. Featuring a power rating of up to 1300W, this mini under sink water heater is considered to one of the most powerful on this list. That’s why we highly-recommend this under sink water heater.
- Quality: This water heater is made up of premium quality materials for maximum durability and flexibility. Although, it is Amazon’s recommended product which means you’ll not have to worry about safety, performance, and price point.
- Performance: This instant water heaters electric under sink will not disappoint you in any way. As it is equipped with a bracket of mounting, a glass-lined tank, fast recovery, and T & P valves for added flexibility. Besides, as far as temperature concerns, this unit can be adjusted up to 140-degrees F. Besides, it also has a very quiet operation which makes it a top-notch choice for the people who adore quietness & serenity more than anything.
- Features: This instantaneous water heater for kitchen sink features an ergonomic design and 1,300W power rating to provide you endless hot water on demand. Moreover, one of the amazing features of this under sink tankless water is that it offers a 6-years warranty on the tank which is great!
- User reviews: This unit contains a 69% 5-star rating from its customers.
- Overall rating: 4.5 out of 5.0
- Best use: This instant water heater is best to use, kitchen, and outdoor picnics.
Pros
- Easy to install
- Warmth
- Tech support
- Worth money
- Packaging
- Temperature control
- Affordable price
Cons
- Possibility of leakage
2- Eccotemp EM-2.5 – smallest under sink water heater
Eccotemp is a well-known brand that offers small, lightweight, and compact water heaters at affordable prices. And this is the unit in which your trust can be invested. However, it has a relatively small 2.5 GPM tank, but it delivers excellent heating performance. Moreover, as we already mentioned, this heater also has a compact & lightweight design which allows you to hang it on the wall if you’re looking t save space.
- Quality: This under sink electric water heater is also made up of high-quality materials for maximum safety & performance. Its portable & lightweight design allows you to take it anywhere without any hassle.
- Performance: This unit will surely deliver an incredible performance as it features with fast recovery rate which provides you endless hot water on demand wherever you want. Not only that, but it also features with pressure relief value which enhances the overall safety and protects the heater adequately. Indeed, this unit is perfect, if you’re looking for the best under sink tankless water heater. However, one downside of this compact water heater is that it’s a bit slower in operation than other units in the market.
- Features: This mini water heater features built-in temperature control which allows the user to effectively increase the heating temperature from 50-140 degrees. These features also make it ideal for bathroom usage. Besides, it also comes with a 5-years warranty which is actually a good deal, if you don’t want to waste money on less durable & reliable products.
- User reviews: This mini tankless water heater contains a 74% 5-star rating from its customers.
- Overall rating: 4.4 out of 5.0
- Best use: This unit is best for kitchen, under sink use, and shower as well.
Pros
- Easy to install
- Warmth
- Value for money
- Affordable price
- 5-years warranty
- Fast recovery rate
- Temperature control
Cons
- A bit slower in operation
3- WaiWela WM-2.5 – instant hot water heater under kitchen sink
WaiWela once again showed up its remarkable contribution to the home appliances industry with its WM-2.5 under sink water heater. What makes this mini water heater under sink stand out from others is its build-quality and outstanding manufacturing techniques. This water heater is a top-notch choice for many customers. We highly recommend it because of the durability, performance, and price point.
- Quality: It is made up of high-quality materials & advance manufacturing techniques for maximum durability & flexibility.
- Performance: This unit delivers a decent performance as it is equipped with a thermostat for temperature control and to prevent the unit from overheating. It is also floor or wall-mounted, allowing to hang it on the wall or place it on the floor. So, if you’re looking for a high-end water heater, then your search ends here.
- Features: This point of use tankless water heater features a glass-lined tank and attached power cord. One of the best thing is that it provides a 6-years limited warranty on the tank and a 2-years warranty on other parts.
- User reviews: This unit contains a 74% 5-star rating from its verified customers.
- Overall rating: 4.4 out of 5.0
- Best use: This heater is ideal for home and under sink.
Pros
- Easy to install
- Temperature control
- Value for money
- Affordable price
- 6-years limited warranty on tank
- 2-years warranty on parts
Cons
- Needs to careful regarding temperature
4- Precision Temp RV-550 – Best tankless water heater
Here is another amazing under sink tankless water. This unit can be used for several purposes like tailers, mobile washing services, RVs, and pets also. That’s why we highly-recommend this tankless water heater.
- Quality: it is made up of premium quality materials for added durability and flexibility. This device will surely last for years.
- Performance: This device will surely deliver excellent performance as it is equipped with no pilot light and high propane efficiency to provide endless hot water on demand. Moreover, this is a USA-made product that is fully tested & assembled in the USA.
- Features: It features with VariFlame technology control system and a free protection burner system that allows the burner to fire all the electric elements that are activated once.
- User reviews: This unit contains an 82% 5-star rating from its customers.
- Overall rating: 4.4 out of 5.0
- Best use: This heater is ideal for under sink & kitchen.
Pros
- Easy to install
- Warmth
- Safe to use
- Temperature control
- Affordable price
Cons
- None
5- Thermoflow UT10 – 120v tankless water heater
If you don’t want to wait for your on-demand hot water and want to reduce the time you need to wait considerably, then you will you’ll love this under sink water heater from Thermoflow. It is loaded with a small tank that is capable of heating up to 2.6 Gallons. However, this unit may insufficient for large homes, but it is still perfect for you if you only need it for certain sink use.
- Quality: This unit is crafted with a heating element and a stainless steel tank engineered for durability, easy replacement, and efficiency.
- Performance: This water heater is equipped with a thermostat that allows you to pick the right & comfortable temperature for yourself. Besides, it’s also easy to install and safe to use thanks to the inclusion of the active protection circuit known as thermos top. This circuit is designed to dis-allow overheating, and stopping at the most ideal temperature you want.
- Features: This best under sink instant water heater features with energy-saving mode and a frost protection mode which makes this compact unit a suitable option for all reasons. Moreover, like high-end water heaters out there, this one also heats the water quickly and has a fast recovery rate.
- User reviews: This heater contains a 67% 5-star rating from its customers.
- Overall rating: 4.2 out of 5.0
- Best use: This heater is best for the whole house, and kitchen.
Pros
- Easy to use
- Warmth
- Safe to use
- Temperature control
- Fast recovery rate
- Cheap under sink water heater
Cons
- Construction is too big for under sink
6- Eco-Smart 8KW – instant hot water heater under sink
With its extremely durable construction and ability to reduce electric bills up to 60%, this Eco Smart 8KW under sink water heater is a perfect choice for your kitchen. However, it’s also referred to as a heater for the whole home. With 1.5 GPM water capacity means it is perfect for a home with one bathroom. However, it is recommended by Eco Smart to use this unit where the temperature goes as high 60-degree or low as 70-degrees.
- Quality: This compact hot water heater under sink is made of premium-quality materials that make it highly durable & reliable.
- Performance: for easy installation, this under sink electric water heater comes with a compression fitting & adapter for compatibility with other appliances. Besides, due to its small & compact design, it consumes less power. However, if you’ve any technical issues regarding the unit, then Eco Smart has excellent customer service that is totally dedicated to help customers and solve their issues there as soon as possible.
- Features: This under sink electric water heater features a digital display screen on the front of the unit that allows the user to have full control over the operation of the device. Besides, the built-in silver knob allows you to switch between Fahrenheit and Celcius and also adjust the temperature. And the best thing is, it comes with an amazing lifetime warranty.
- User reviews: This unit contains a 61% 5-star rating from its customers.
- Overall rating: 4.1 out of 5.0
- Best use: This electric tankless water heater is ideal for kitchen, and home with only one bathroom.
Pros
Pros
- Easy to install
- Energy efficient
- Warmth
- Temperature control
- Tech support
- Value for money
- Lifetime warranty
- Affordable price
Cons
- Can’t produce hot water on high-flow rate
Best Under Sink Tankless water heater Buyer’s Guide
As we promise, here is a buying guide for the best under sink water heater.
Why buy an under sink tankless water heater?
Under sink water heaters are meant to provide endless hot water for your kitchen faucet. It is an excellent option for you if you want to save money. They’re fast & efficient as they instantly warm the water. Besides, they also help in eco-friendly options, unlike other conventional products. Because they reduce environmental impacts.
Factors to consider before buying the Best under Sink water heater
Here some important factors, you must consider before purchasing an under sink tankless water heater.
Hot water:
You must need to consider hot water demand before buying an under sink water heater. This includes water that you need per minute to help you to make good decisions for under sink water heater. That’s why you should always consider your needs before picking ideal types of products for needs.
Location:
This factor is also important. Because water temperature varies depending n the height above sea level and climate conditions of the region. Therefore, if you’re in a cold region, then you’ll need a powerful heater that provides endless hot water on demand.
Voltage:
This factor determines the amount of electricity it consumes. The kind of heater that you’ll purchase will’ be determined by the space available.
Cost:
This is the most important factor if you’re on a tight budget. Because some units are cheaper than others depending on their effectiveness and the features they contain. So, always buy an affordable under sink water heater that meets your needs.
Energy efficiency:
Under sink water heaters are more energy-efficient than traditional heaters. Because they don’t use alit of energy. That’s why it recommended checking the energy rating from the rach brand before you purchase it.
Conclusion:
We think that Stiebel Eltron is the best under sink tankless water right now. as it is equipped with a glass-lined tank and fast recovery technology to provide endless hot water demand. Besides, it also comes with a 6-years manufacture warranty on the tank.
second, we’ve got Eccotep EM-2.5, this under sink electric tankless water heater features with a really compact which allows you to install it anywhere. moreover, you can also hang it on the wall or place on the floor as well.
the last bu,t not least, we’ve WaiWela WM-2.5, this best point of use tankless water heater features an adjustable thermostat that allows you to control temperature and prevents the unit from overheating.
Frequently Asked Questions About Best Under sink tankless water heater
What is the best instant hot water heater?
- Stiebel Eltron 2332
- Eccotemp EM-2.5
- WaiWela WM-2.5
- Precision Temp RV-550
- Thermoflow UT10
- Eco-Smart 8KW
Are instant hot water heaters worth it?
Month to month water heating costs is cheaper with a tankless unit. However, it could take years to make up for the initial cost. But according to the consumers, they’re valued for money.
How long does a tankless water heater last?
Various tankless water heaters have a life expectancy of more than 20-years. They also have easily replaceable parts that extend their life to many years.
Tankless Vs tank?
According to experts, for homes that use 41Gallons hot water daily, then tankless water heaters are perfect. Because they’re more energy-efficient than conventional heaters.