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Thermoflow Electric Mini Tank Water Heater, 4.0 Gallon 120V Corded Under Sink Small Hot Water Heater for Point of Use Instant Hot Water

3.9 3.9 out of 5 stars 725 ratings

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4.0 Gallons

Purchase options and add-ons

Brand thermoflow
Product Dimensions 12.2"W x 18"H
Special Feature Quickly Hot Water Supply, Compact Size Saves Space,Two Modes Optional, suitable for any season.
Color White
Wattage 1500 watts
Capacity
4 Gallons
Power Source
plug in,120V
Material
Stainless Steel
Style
4.0 Gallons

About this item

  • ➤ Instant Sink Hot Water - 4 gallons capacity, point-of-use mini tank water heater fits under your sink to provide immediate hot water right where you need it. Eliminate time for hot water. Dimensions: 18H x 12.2W x 11D inches, 2.6ft cord Plugin to use.
  • ➤ Long life Service - This compact mini tank water heater use stainless steel tank to reduce corrosion and maintenance.
  • ➤ Save Energy - Fast recovery and thermal efficiency up to 98% using stainless steel heating element, 3-layer EPS foaming insulation reducing heat lost, provide you more hot water with less power power consumption.
  • ➤ Safe & Reliable - Over-heat protection, auto cut-off electricity if not hot water come out, IPX24 water proof, 2.6ft plug in cord, suit for kitchen, bathroom, bar, school, hospital, office and RV.
  • ➤ NOTES - Please verify that this model is the right size for your hot water needs and electrical requirements before purchase & installation. Dimensions: 18H x 12.2W x 11D inches; Weight: 14 lbs; Water connections: 1/2 inch NPT, Electrical requirements: 1.5 kW, 120 Volts. Max pressure: 150PSI. Nominal current: 13A.
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Customer ratings by feature

Energy efficiency
4.1 4.1
Temperature Control
4.0 4.0
Easy to install
3.8 3.8
Value for money
3.6 3.6

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Product Description

mini tank water heater electric
thermoflow mini tank water heater

Under Sink Electric Water Heater

Compact for Small Space

High Energy Efficiency

mini tank water heater

Comparison of thermoflow Water Heater Electric

mini tank electric water heater

UT15

UT10 Electric mini tank water heater

UT10

24kw water heater

Elex 24

5.5kw water heater

Elex 5.5 plus

3.5L water heater

Elex 3.5L

Customer Reviews
3.9 out of 5 stars
725
3.9 out of 5 stars
725
3.3 out of 5 stars
64
3.4 out of 5 stars
352
3.4 out of 5 stars
352
KW
1.5 1.5 24 5.5 3.5
Electrical Requirements
50A/240V 13A/120V 13A/120V 23A/240V 20A/ 120V
Temp.Range
45°F-167°F 45°F-167°F 104°F-167°F 95F-122°F Temp.Rise 65F at 0.4GPM
Required Breaker
1x 2-POLE 15AMP 1x 2-POLE 15AMP 2×2-POLE 60AMP 1 ×2-POLE 30AMP 1×2-POLE 30AMP
Wire Gauge/Type
Plug-In Plug-In 2 x 10AWG/ Hard wired 1×12 AWG/ Hard wired 1×12 AWG/ Hard wired
Size
18"H × 12.2"W × 11"D 18"H × 12.2"W × 11"D 18.6"H ×10"W × 4.5"D 7.4"H × 5.4"W × 3.4"D 7.4"H × 5.4"W × 3.4"D
Weight
15.7 Ibs 15.7 Ibs 8.4 Ibs 3 Ibs 3 Ibs
Water Connections
1 /2"NPT 1 /2"NPT 1 /2"NPT 1 /2"NPT 1 /2"NPT

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Technical Details

Additional Information

Warranty & Support

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Product Warranty: For warranty information about this product, please click here

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Thermoflow Electric Mini Tank Water Heater, 4.0 Gallon 120V Corded Under Sink Small Hot Water Heater for Point of Use Instant Hot Water


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Thermoflow Electric Mini Tank Water Heater, 4.0 Gallon 120V Corded Under Sink Small Hot Water Heater for Point of Use Instant Hot Water
thermoflow Thermoflow Electric Mini Tank Water Heater, 4.0 Gallon 120V Corded Under Sink Small Hot Water Heater for Point of Use Instant Hot Water
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Price$179.99$199.99$169.99$199.99-18% $179.99
List:$219.99
$229.99
Delivery
Get it as soon as Tuesday, Apr 2
Get it as soon as Thursday, Apr 4
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Get it as soon as Tuesday, Apr 2
Customer Ratings
Temperature Control
4.0
4.2
4.2
4.3
4.2
Easy to install
3.8
4.4
4.3
4.6
4.3
Tech Support
4.0
3.6
3.7
3.5
Sold By
thermoflow
THMOS
Fogatti RV World
THMOS
Fogatti Water Heater
Camplux
capacity
4 gallons
4 gallons
4 gallons
4 gallons
4 gallons
6.5 gallons
power source
plug in,120V
Corded Electric
Corded Electric
Corded Electric
Corded Electric (Plug-In)
AC
mounting type
Wall or Floor
Wall-mounted, Floor-mounted
Protruding
Wall or Floor Mounted
max operate pressure
150 pounds per square inch
150 pounds per square inch
150 pounds per square inch
150 pounds per square inch
maximum pressure
150 pounds per square inch
150 pounds per square inch
150 pounds per square inch
150 pounds per square inch
150 pounds per square inch
material
Stainless Steel
Fused ceramic
SPGC
Stainless Steel
SPGC
style
4 Gallons
4 Gallons
Indoor Installation
Adjustable
Enamel
‎6.5 Gallon

Important information

Wattage

1500 watts

Bulb Voltage

120 volts

Customer reviews

3.9 out of 5 stars
3.9 out of 5
725 global ratings

Customers say

Customers like the performance of the water heater. They say it is both efficient and effective. They like the size, and ease of installation. However, some customers have reported issues with the pressure relief valve. They mention that the valve is faulty and blasts away. Customers are also disappointed with leakage. They disagree on quality and value.

AI-generated from the text of customer reviews

91 customers mention77 positive14 negative

Customers like the performance of the water heater. They say it works well, is efficient, and effective. Some customers also mention that the design is decent.

"Works great & heats water fast. Is perfect for under out kitchen sink. When unit went out, Thermoflow warrantied the tank & sent a new one quickly." Read more

"...Otherwise, they do the job, fit under the sink, install easily, and does what is expected of such a product...." Read more

"...Otherwise works great." Read more

"The perfect size for our storage building. Very easy to install. It works great" Read more

85 customers mention69 positive16 negative

Customers find the installation of the water heater to be easy. They mention that the product is easy to install, the plumbing was simple, and it plugs right in.

"...getting to the sink from a primary water heater, but also makes doing quick tasks which require a little bit of hot water super easy...." Read more

"...Otherwise, they do the job, fit under the sink, install easily, and does what is expected of such a product...." Read more

"Unit heats up super quick and produces extremely hot water. Install was very easy and came with fittings and gaskets...." Read more

"Easy install. However it has a drip leak “very slow” and have not found were it is leaking...." Read more

35 customers mention25 positive10 negative

Customers like the size of the water heater. For example, they say it's compact, lightweight, and easy to install. Some say it fits perfectly in their bathroom closet and under their sink. That said, most are happy with the size and performance of the product.

"...Otherwise, they do the job, fit under the sink, install easily, and does what is expected of such a product...." Read more

"The perfect size for our storage building. Very easy to install. It works great" Read more

"...Size was great - having it built to SIT on the counter floor rather then requiring hang on the wall a real plus...." Read more

"...My only gripe is that the smaller gaskets aren’t great and one fell apart resulting in me needing to go get a pack of good O-rings from the hardware..." Read more

150 customers mention83 positive67 negative

Customers are mixed about the quality of the water heater. Some mention that it gets the water hot in no time, provides adequate hot water for under the kitchen sink, and is nice to have hot water almost immediately. However, others say that it did get very hot, then stopped heating the water after about 3 months. The temperature control is a joke, and the element burned out.

"Works great & heats water fast. Is perfect for under out kitchen sink. When unit went out, Thermoflow warrantied the tank & sent a new one quickly." Read more

"...My only gripe is that the smaller gaskets aren’t great and one fell apart resulting in me needing to go get a pack of good O-rings from the hardware..." Read more

"Hot water without the wait. Not only does it mean less waste waiting for the hot water getting to the sink from a primary water heater, but also..." Read more

"...I've had it running and it leaks from that swivel coupling. It heats up nicely. Took a normal shower with warm water. That's how normally bathe...." Read more

30 customers mention20 positive10 negative

Customers are mixed about the value of the water heater. Some mention it's a great value, while others say it'll be a waste of money.

"...cold water but sometimes you want to disinfect and this was a cost-effective way to make that happen." Read more

"...Cheaply made, crappy heater. Awesome when it works but not worth it due to the inferior components it uses...." Read more

"...This was the perfect solution! Easy to install and very affordable. Water heats up quickly and trust me it gets hotter than anyone could ask for...." Read more

"...Amazing that something so inexpensive can change any everyday problem. So far so good...." Read more

38 customers mention0 positive38 negative

Customers are dissatisfied with the leakage of the water heater. They mention that it rusted internally, the fittings leak, and the pressure relief valve leaks. Some say that the swivel fitting leaks and has to be replaced.

"Easy install. However it has a drip leak “very slow” and have not found were it is leaking...." Read more

"...I've had it running and it leaks from that swivel coupling. It heats up nicely. Took a normal shower with warm water. That's how normally bathe...." Read more

"...Once my husband put the parts on and turned it on, it started leaking up top by the values...." Read more

"Liked the size and performance but started leaking from the temp controller" Read more

19 customers mention3 positive16 negative

Customers are dissatisfied with the leaking of the water heater. They mention that it leaks water out of the front just under the temperature. Some say that the unit works fairly well, but it slowly seeps back out. Overall, customers are not happy with the quality and performance of this product.

"...setting, the unit does not turn off resulting in scalding hot water coming out of the faucet...." Read more

"...Since the water leak it trips the gfi. So there is some type of current leak to ground. I have tested other items on this gfi and they are fine...." Read more

"...Two days later I found water on the basement floor. Water was flowing out of the heater case...." Read more

"...On long washes, the reservoir will run out and we’ll get lukewarm for a few moments until the hot water arrives from the whole house unit...." Read more

10 customers mention0 positive10 negative

Customers are dissatisfied with the pressure relief valve of the water heater. They say it's faulty, poorly engineered, and blasts away. Some customers also mention that the pop-off valve was defective.

"...This is a point of contention because you can't install the pressure valve unless you use the supplied swivel fitting...." Read more

"The install required additional plumbing, which didn't seem obvious to me when ordering. It looked like it came with everything it needed...." Read more

"...The very cheap pressure relief valve gets mounted to the stems which are behind the control panel; so there is not enough clearance to screw on the..." Read more

"The pressure relief valve isn’t friendly and very difficult in my opinion" Read more

Get your parts before you start
3 Stars
Get your parts before you start
So, this unit is tall for a mini. Only because they've tried to hide the pipes from view by making the front taller. This is a point of contention because you can't install the pressure valve unless you use the supplied swivel fitting. But it's a POS fitting that breaks apart if you tighten it how one normally does. I've had it running and it leaks from that swivel coupling. It heats up nicely. Took a normal shower with warm water. That's how normally bathe. Took my normal time n had no issues. Other than the leaky union. I'm working on that as we speak but I guess it's ok for the price. Would I purchase again? Maybe. Do I recommend? Only If you're good with plumbing or know a good handy man.
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Top reviews from the United States

Reviewed in the United States on January 18, 2019
Style: 2.5 GallonsVerified Purchase
Customer image
5.0 out of 5 stars Great unit, odd control knob
Reviewed in the United States on January 18, 2019
Hot water without the wait. Not only does it mean less waste waiting for the hot water getting to the sink from a primary water heater, but also makes doing quick tasks which require a little bit of hot water super easy.

The temperature dial is a bit weird so have attached my interpretation for use as an undersink heater in a bathroom or kitchen.

Bought two. Installation is easy. I used a 1/2 inch NPT (national pipe thread) flexible faucet connector much like the one which was installed under the sink except longer because of where I could fit the unit.

I've been running them for a couple months with no trouble.

EDIT: a few years later, both units are still working like new. Highly recommended.
Images in this review
Customer image
Customer image
136 people found this helpful
Report
Reviewed in the United States on January 21, 2024
Style: 4.0 GallonsVerified Purchase
One person found this helpful
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Reviewed in the United States on July 25, 2021
Style: 2.5 GallonsVerified Purchase
3 people found this helpful
Report
Reviewed in the United States on March 6, 2024
Style: 4.0 GallonsVerified Purchase
Reviewed in the United States on April 27, 2019
Style: 2.5 GallonsVerified Purchase
Reviewed in the United States on December 16, 2020
Style: 2.5 GallonsVerified Purchase
One person found this helpful
Report
Reviewed in the United States on March 8, 2024
Style: 4.0 GallonsVerified Purchase
Customer image
3.0 out of 5 stars Get your parts before you start
Reviewed in the United States on March 8, 2024
So, this unit is tall for a mini. Only because they've tried to hide the pipes from view by making the front taller. This is a point of contention because you can't install the pressure valve unless you use the supplied swivel fitting. But it's a POS fitting that breaks apart if you tighten it how one normally does. I've had it running and it leaks from that swivel coupling. It heats up nicely. Took a normal shower with warm water. That's how normally bathe. Took my normal time n had no issues. Other than the leaky union. I'm working on that as we speak but I guess it's ok for the price. Would I purchase again? Maybe. Do I recommend? Only If you're good with plumbing or know a good handy man.
Images in this review
Customer image Customer image
Customer imageCustomer image
Reviewed in the United States on January 14, 2019
Style: 2.5 GallonsVerified Purchase
45 people found this helpful
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Top reviews from other countries

Roy
5.0 out of 5 stars Delighted
Reviewed in Canada on September 16, 2020
Style: 4.0 GallonsVerified Purchase
2 people found this helpful
Report
Jas Davs
4.0 out of 5 stars Pretty Decent
Reviewed in Canada on October 7, 2022
Style: 4.0 GallonsVerified Purchase
L Joanne McDow
1.0 out of 5 stars Leaks
Reviewed in Canada on June 3, 2023
Style: 4.0 GallonsVerified Purchase
SHARON V.
5.0 out of 5 stars Don't use thread tape with the included fittings
Reviewed in Canada on March 2, 2023
Style: 4.0 GallonsVerified Purchase
Customer image
SHARON V.
5.0 out of 5 stars Don't use thread tape with the included fittings
Reviewed in Canada on March 2, 2023
The included fittings are meant to be sealed with the included rubber seals, so do not try to seal the threads with tape. I was wary of buying this unit because of the reviews saying that the fittings are no good, but it seems these people just didn't know how to use them. If you overtighten the adjustable fitting, it will come apart, but it can be pressed back together; just don't overtighten it again. I tightened everything by hand and there were no leaks.
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Customer image
3 people found this helpful
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Lou C
4.0 out of 5 stars Nice little water heater
Reviewed in Canada on June 6, 2021
Style: 4.0 GallonsVerified Purchase
One person found this helpful
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