Tired of using freezing cold water during the winter? Or, maybe you just wanna replace your old heater with some more useful. In this article, we give you instant hot water heater under sink reviews.
Undersink water heaters are compact, easy to install, budget friendly more often than not, and perhaps the perfect choice if you want a lukewarm water in your home at all times without having to wait for too long.
So, don’t let your eyes wonder elsewhere as we give you our 5 best under sink water heaters reviews.
Table of Contents
- 1 Our Top 5 Instant Hot Water Heater Under Sink Reviews:
- 2 Things to Check Before Buying an Instant Water Heater
- 3 Keep It Heated!
Is It Really Instantaneous?
While under sink water heaters are known to provide quick access to hot water, these are not quite instantaneous in every sense of the word. More so, when the heater is situated further away from the fixture you are using.
It depends a lot on the volume as well as the number of fixtures in use. For example, a heater ideal for two showers might stumble to provide instant hot water when you turn on another fixture.
But, many people opt to use a recirculating pump which certainly increases the flow and makes the supply of hot water instantaneous.
Soo… there’s no question that you’ll invest your money in the right place if you buy an under sink heater. But, you just have to be smart about picking the right one.
Our Top 5 Instant Hot Water Heater Under Sink Reviews:
- Bosch Electric Mini-Tank Water Heater
- EcoSmart ECO 11 Electric Tankless Water Heater
- InSinkErator Hot Water Dispenser
- Camplux Water Heater 120V
- Rheem Tankless Water Heater
Bosch Electric Mini-Tank Water Heater
Top Specs 
- Dimension: 13.75 x 13.75 x 13.5 inches (4-gallon)
- Weight: 17.4 pounds
- Temperature: 65-145 F
- Recovery Rate: 6.8 GPH
- Tank Volume: 2.5/4 gallons
- Voltage: 120V
Product Details
A stream of instantly heated water? Compact to place under the sink? Yet large enough to supply required hot water? Then Bosch under sink water heater is the perfect choice.
The Bosch mini tank heater comes in three different sizes (two available now). 2.5 gallons, 4 gallons, and a 7 gallons model. You can take the one suitable for your needs. The fact that you can mount it on the wall, keep it on a shelf, or simply put it on the floor is certainly convenient.
Besides, a long 36-inch cord shouldn’t make it too hard to set it up at a convenient place.
Pressure and temperature valve ensures the safety of the user as well as the machine itself. Moreover, it adds to the durability of the product along with the CFC free foam insulation.
If you are staying somewhere where it’s too hot during the day then you can turn the Bosch off completely. In addition, the thermostat regulator can be turned to minimum, ideal, and maximum state.
Even though a DIY installation is possible, but we do recommend calling an expert for a pitch perfect installation.
- Tank size variations.
- Can supply up to 2 sinks.
- Relief valve for safety.
- Installation brackets included.
- Good appearance.
- Not completely free from leakage (if not installed right).
EcoSmart ECO 11 Electric Tankless Water Heater
Top Specs 
- Dimension: 11.5 x 8 x 3.75 inches
- Weight: 6.5 pounds
- Temperature: 80-140F
- Recovery Rate: 6.8 GPH
- Tank Volume: Tankless
- Voltage: 220V
Product Details
If the space under your sink seems too congested then you need something like Ecosmart tankless water heater.
Apart from being a compact heater, EcoSmart has a self-modulating technology which helps to provide optimal heated water. Also, it is gonna help reduce the extra zeros in your bill because it is expected to have more energy efficiency than Bosch. But, EcoSmart will fall short in performance under temperatures below 63-65F.
I do like the thermostat as well as the digital screen that shows the water temperature you are receiving. Clicking the thermostat will turn the machine on/off and a 3-second press actually converts the temperature from Celsius to Fahrenheit and vice versa.
This one is an ideal pick if you are looking for an under sink water heater for shower since the tankless system kind of provides endless water supply. So, running out of hot water is out of question.
EcoSmart undersink water heater’s got a sleek design too. Just because it has to sit under the sink doesn’t mean it cannot add beauty to your home, right?
By the way, there’s a lifetime warranty on offer provided that the installation was done by a professional.
- Compact
- Good control w/ thermostat.
- Digital screen.
- Good for shower.
- Lifetime warranty.
- Takes time.
InSinkErator Hot Water Dispenser
Top Specs 
- Dimension: 14.63 x 9.88 x 8.38 inches
- Weight: 6 pounds (approx.)
- Temperature: 200F (Max)
- Recovery Rate: N/A
- Tank Volume: 2-3 Gallons
- Voltage: 115V
Product Details
InSinkErator’s high price might give you second thoughts. But, an instantaneous hot water producing capability along with the filtering system makes it an ideal under sink water heater for home.
Of course, having a filtering system for cleaner and safer water is great. But, the highlight has to be the instant on demand hot water availability. It doesn’t take long to give you heated water.
InSinkErator’s ability to provide up to 200F water temperature just boggles my mind (put a question mark on that number). Moreover, you’ll love the thermostat which makes it easy to control the temperature. Installation? Nothing too hard that you’ll need a plumbing degree and there’s also a good warranty deal if you mess things up.
A tank with 2-3 gallons capacity should suffice everyday use. I mean it’s not like you’ll use hot water at all times.
One drawback perhaps is that it is not as compact as the EcoSmart. Besides, there’s also a filter system you have to place. So, you might wanna put the bucks back in your pocket if you’ve got a small space under the sink.
- Quick supply.
- Ideal for home.
- Filtering system included.
- Safe & easy installation.
- Connecting parts not included.
- Expensive for the quality.
Camplux Water Heater 120V
Top Specs
- Dimension: 17.25 x 11.75 x 10.38 inches
- Weight: N/A
- Temperature: 77-140F
- Recovery Rate: 6.8GPH
- Tank Volume: 2.5 Gallons
- Voltage: 120V
Product Details
Ideal for outdoor use, we give you another instant hot water heater under sink reviews; this is the Camplux point of use mini-tank heater.
What attracted us to this product is the extra safety features included which are often not used in many heaters. It has the technology to protect from overheating. This is very useful for a machine like this which can provide 77 to 140 Fahrenheit of hot water.
Furthermore, it comes with convenient pressure and temperature valve which adds to the safety of use of the Camplux under sink hot water heater.
Unlike InSinkErator which makes it hard to tell whether it is working or not, Camplux has a working indicator light. And the temperature control is easy as with any heater thanks to the thermostat.
Built-in protects the model from overheating. But, you can also protect the water from freezing during cold winter days. Simply turn the thermostat to snowflake position and it’ll offer freeze protection.
With a long 43.3 inches cord, the Camplux is safe to keep anywhere on your floor, shelf, or on the wall.
- Overheating protection.
- Water freezing protection.
- Long cord.
- Safe heater.
- Can’t say it is compact enough like the others.
Rheem Tankless Water Heater
Top Specs
- Dimension: 12.63 x 8.25 x 3.63 inches
- Weight: N/A
- Temperature: Over 100F
- Recovery Rate: N/A
- Tank Volume: Tankless
- Voltage: 240V
Product Details
Excellent temperature accuracy and a sleek design puts Rheem electric tankless water heater in number 5 position.
Best instant hot water heater under sink are always gonna offer the advantage of having a good control over the temperature. And you’ll love using the thermostat on this product which gives a +1 Fahrenheit adjustable option.
Moreover, the digital screen ensures that you always know the temperature you are getting. As a result, there’s no chance of scalding.
Simpler installation is always appreciable when it comes to something like a water heater. You can set it up in about 10-15 minutes max. Besides, the required adapters and connectors are included with the product unlike InSinkErator.
And of course, it goes without saying that this tankless version will consume less energy and save some of your bucks for sure. By the way, there’s even the self-modulating tech like EcoSmart to ensure that the water comes out at the right heat.
- +1F control.
- Digital screen.
- Good water flow.
- On demand hot water.
- Might fall short in supporting more than one fixture.
- Size is not so compact.
Things to Check Before Buying an Instant Water Heater
You just can’t buy any under counter water heater. While the designing and the look of some products may look appealing; other factors matter more when it comes to investing in an under the sink water heater.
Will it fit? You don’t wanna buy something large and then find out that the space under your sink is too small for the heater. So, get a tape and do the measuring first.
Tank or tankless? Both types are fine as under sink instant water heaters. But, using multiple fixtures at once can bog down the performance of a tankless model. As the same time, tankless are more compact and can reduce cost even though they are more expensive to buy.
Safe or are you taking a risk? Some models have auto shut down feature that stops all operation in case of any problem. Other safety features include relief valve, overheating protection, etc.
Sufficient supply of hot water? If you wanna know if the heater will suffice your hot water demand then take a look at the recovery rate. Higher rate indicate quicker supply of heater water when you need so.
The right voltage, a good water flow, heating capability, and a proper warranty all play a role when you wanna pick the best under sink water heater.
A Myth Debunked: No Maintenance is Required for Tankless Heater
I know I know! Who wouldn’t like to install a heater and forget about taking a look at it once in a while. But, I am sorry to say that tankless water heaters too need maintenance.
This is especially true if you are living in an area where there’s hard water or perhaps the pH level isn’t quite favorable. You’ll certainly need to take care of the heater in such conditions. Now, there are some things you can do which will help. But, it will not entirely give the liberty of not maintaining the heater at all.
A pre-water filter can decrease maintenance. Some heaters actually include a pre-filter with the product. No problem if you are taking a heater that is not included with the filter because you can buy it individually if you wish. If you reach that type of situation then our under sink water filter reviews will be your proper solution. Another thing is something called a flushing isolation kit. This cleans the inside and allows you to properly maintain the heater without any extra hard work.
Keep It Heated!
Water heaters come with different temperature range. Among the factors we mentioned, picking the right one also depends on the locality you live in. We hope that you can choose and purchase a good product from our 5 instant hot water heater under sink reviews.
Don’t shy out from commenting below if you have any further queries.
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