Thermoflow UT15 4 Gallons 110~120V Corded Electric Mini-Tank Water Heater Under Sink 110V ~ 120V, 1.5kW at 120 Volts

(10 customer reviews)

Price: $169.99

➤ 4 GALLON CAPACITY – 4 gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it. Stainless steel tank and heating element designed for efficiency, durability and long life service (Relief Valve has been upgraded)

➤ Save Energy – Low stand-by loss power consumption. With Advanced Thermostop Technology of Germany, stop heating or reheating automatically when the water heater reaches a high or low set temperature

➤ EPS FOAMING TECHNOLOGY – Heating water quickly and better insulation, fast recovery rate eliminates long waits for hot water at your sink

➤ 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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Brand ‎thermoflow



Thermoflow UT15 4 Gallons 110~120V Corded Electric Mini-Tank Water Heater Under Sink 110V ~ 120V, 1.5kW at 120 Volts

Thermoflow UT15 4 Gallons 110~120V Corded Electric Mini-Tank Water Heater

Thermoflow UT15 4 Gallons 110~120V Corded Electric Mini-Tank Water Heater

Thermoflow Mini-Tank Water Heater

Live Smart, Better Life!

‘thermoflow’ is mainly concentrate on comfortable tankless and minitank electric water heaters, giving people a comfort and healthy life start from the heat. Since the core conception, we have utilized the latest German technology to engineer the products with maximum energy saving operation. Our mission is to improve the people’s life and to spread awareness of benefits from ‘thermoflow’ friendly products.

An Ideal Solution For:

  • Kitchen & Bathroom Sinks
  • Basement Wet Bars
  • Doctor’s Office
  • Kitchenettes
  • Patio Sinks
  • Small Apartments
  • Strip Malls

Electric Point of Use Water Heating Solutions


Low Standy Loss Power Consumption – Selectable temperature range between 45°F to 167°F, two modes options, energy saving mode and frost protection mode, suitable for any season.

Minimize Wait Time for Hot Water – Maintenance-free stainless steel tank and EPS foaming heating system. Stores up to 4.0 Gallons of water to supply hot water quickly. There’s minimal stand-by loss from this premium mini-tank water heater, saves water by eliminating the wait for hot water to reach your faucet.

  • Dimensions: 18”H x 12.2”W x 11”D
  • Weight: 14 lbs
  • Water Connections :1/2” NPT
  • Nominal Pressure: 115 PSI
  • Nominal Current:13A
  • Required Breakers:1×15 AMP Double Pole

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mini tank 4 gallonsThermoflow Mini-Tank Water Heater

Electric Point of Use Mini Tank Water Heaters

Thermoflow UT15 electric mini tank water heater is a true Point of Use Model because it is specifically designed for under sink. In fact, the Thermoflow can be used for three different applications: as a sole water heating source for a single sink, as a supplement to an existing heater located far from the sink, and as a buffer installed in-line with tankless water heaters that experience intermittent cold water, also known as ‘cold water sandwiching’. No matter the configuration, there’s minimal stand-by loss from this premium mini-tank water heater.

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Multiple Applications for Thermoflow Electric Mini Tank Water Heaters

Elex 12-1Elex 12-1

Quick Hot Water Supply

Thermoflow UT15 Mini-Tank Water Heater fits for under sink. Provides hot water in seconds at point of use, perfect for a basement wet bar, patio kitchen station, garage, attic, or even in an RV or on a boat, hot water will quickly be in hand.


Saving Energy

Short distance hot water supply, minimize wait time for hot water, saving energy and your bills. Whether as a sole water heating source for a single sink or as a supplement to an existing heater located far from the sink, this premium mini-tank water heater’s stand-by loss is minimal!

dish wash hot water

4.0 Gallons Capacity

4.0 gallons capacity maintenance free stainless steel tank, stores up to 4.0 gallons water to provide hot water where you need it. Fast recovery rate eliminates long waits for hot water at your sink. Supplies up to 3 sinks at a time.

sink use hot water

Great for Small Spaces

Water heaters are compact and lightweight and can be ground mounted – features a sleek and attractive design to blend seamlessly with decor, very friendly to any small spaces.

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Features of Thermoflow UT15 Electirc Mini Tank Water Heater

water connectionwater connection

Auto Cut-Off Protection for Safety

If the hot water temperature higher that the set temperature, water heater will cut off the electric supply automatically to prevent the water heater from overheat. This also reduces the risk of damage to the water heaters.

stainless tank

Maintenance Free Stainless Steel Tank

Thermoflow UT15 Mini-Tank water heaters are stainless steel tank designed, which is easy to maintain and durable for long life. Also it is high efficiency for heating, saving energy and your bills.

Thermoflow UT15 4 Gallons 110~120V Corded Electric Mini-Tank Water Heater

Plug-In Style, Easy to Use

Very easy to install, just plug into a 120v electric supply socket (35 inches power cord includes). Simply tap into the cold water line and install the water heater directly at the sink to provide hot water. Whether you need the thermoflow UT15 for a basement wet bar, patio kitchen station, garage, attic, or even in an RV or on a boat, hot water will quickly be in hand.

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Additional information





‎1500 watts

Product Dimensions

‎18 x 11 x 12.2 inches


‎4 Gallons


‎4 Gallons Mini Tank Electric Water Heater


‎Stainless Steel




‎120 Volts

Item Weight

‎15.18 pounds

Installation Method


Maximum Power

‎1500 Watts

Temperature Range

‎45-167 Degrees Fahrenheit

Maximum Pressure

‎150 Pound per Square Inch

Special Features

‎Quickly Hot Water Supply, Compact Size Saves Space,Two Modes Optional, suitable for any season.

Included Components

‎1X 4 Gallons mini tank water heater, 2X 1/2 inches brass bushings, 1X instruction manual

Batteries Required?




Date First Available

March 5, 2019

10 reviews for Thermoflow UT15 4 Gallons 110~120V Corded Electric Mini-Tank Water Heater Under Sink 110V ~ 120V, 1.5kW at 120 Volts

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    This is the first time in 8 years I don’t have to wait 5 minutes for hot water to wash my face. It saves tons of water by having it ready on hand. Amazing that something so inexpensive can change any everyday problem. So far so good. I did not install it my self but my handyman said it was more difficult than he expected. Don’t call customer service-they tell you to look on the internet.

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    Tennessee Connection

    So far so good … I’ve put two units into service. Especially like the “frost” setting, which I can use in the Guest Bathroom most of the time (nobody there). I’ve run an Watt Meter on the first unit … under normal bathroom use for three days …. cost is 6 cents per day (at 10 cents per KWH). Also like the 1/2″ MPT fittings. So … here’s the deal: IF you already have a 110VAC outlet available, and one extra flex supply line, this is a 5 minute installation. Now to see how long the unit lasts … I’m hoping a long time.

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    mamma j

    I’m sorry that I can only give this product a 5. For me this is my life saver at our campsite. Out heater broke and this was so very easy to install. I love it. Thank you for making hot water so easy to have

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    Dave C.

    Very easy to hook up except I had to wire up an outlet for power. I’ve had it installed for a couple of weeks now and absolutely love it! It feed only a bathroom sink. My main water heater was on the other end of the house. I used to have to wait about a full minute for hot water. Too long for a quick hand wash. Plus, it would cause my 40 gallon water heater to run. Now, with this one under the sink, I have hat water in 1 second. I tapped into the cold water supply for the heater, so the 40 gallon main heater isn’t affected. I’m sure it’s saving me electricity. The 2.6 gallon size is easily sufficient to supply 2 bathroom sinks. It seldom runs.

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    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.

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    Our whole house unit is too far from the kitchen sink, causing us to waste 2.5 to 2.75 gallons of water waiting for the hot to arrive.This unit was easy to install in between the hotwater outlet and the faucet. As a result, we get instantly hot water for washing hands, rinsing dishes, or beginning to wash pots and pans. 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. We can live with that.

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    Kindle Customer

    After looking at a number of products that make the buyer do the protection from hot spots in the take (by adding a pressure valve that needs a drain, This product seems to take care and heat more evenly and without creating local steam from a too hot too small a heating element.Turning on for the first time I listened very close for the characteristic hiss or Pop from over aggressive heating elements – NONE Totally quiet! and the Heat time was very reasonable even quick – Temperature control very smooth with plenty of range.Size was great – having it built to SIT on the counter floor rather then requiring hang on the wall a real plus.One hit – The tank list NPT 1/2″ fitting. Typical USA this is called a “compression Fit” and is NOT a FIP. And Most sinks and faucet connections are smaller, 3/8″ . After a bit of fussing I found a 1/2 to 3/8 compression adapter (home depot etc) that fixed that – but I did have a challenge from the tank needing to be farther then the 30″ lines available in hardware store – Found a great 4-foot with 3/8 compression on both ends from Amazon – which fit the bill perfect. only took 15-20 min to install once all the parts were found.

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    big Ry

    After suffering through winter after winter of cold faucet water in our patient bathroom, and after plumber after plumber said there was nothing which could be done other than wrapping pipes with plug-in pipe warmers (which did not work), I conducted my own research and came across stand alone water heaters. I read through reviews of many such products and saw complaints about rusting and product failure.I kept researching until I came across this product and felt confident in purchasing it. My contractor installed it after needing to install a water-resistant outlet in the bathroom and after drilling into the drain pipe and connecting the hoses. Since our patient bathroom sink has to be accessible to wheelchair patients, there is no cabinet underneath the sink. I wish this water heater tank was able to be attached to the wall but the directions say not to attach. So my contractor built a small platform for the tank to rest on so that the tank does not get contaminated when the bathroom floor is mopped.Normally by the time a person is done washing their hands, the faucet water is still ice cold. But now within a few seconds of the faucet turning on, they get warm water to wash their hands for as long as they need to wash them! I am so happy I purchased this product!

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    Gene Mosmeyer

    This is not a water heater kit.It’s a heater with 2 adapters. Ready to plug in to a simple under-sink outlet.I removed a faucet for replacement and connected the hot water supply hose hose directly to it.Needed to purchase a hose kit from Ace Hardware, to supply hot from the heater up to the sink.The issue was butt-connecting the two 3/8 flare “bib” ends of the hoses.I needed brass adapter fittings.Ace Hardware had 2 simple screw-together fittings to complete that need.Teflon tapeSmall pliersCrescent wrenchFluidmaster brand hose kit #B4F30CUHot water in way less than 2 second at a medium trickle….It’s connected to hot water, so I initial is set hotter than the house heater for scalding dishes,yet I can use 20 gallons of water if needed, and it hardly fluctuates colder in temperature.If people are worried about rupturing or leaking, install a simple pressure regulator to lessen the force……I plan to use these under bathroom sinks next.No drain to plumb in either……

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    Kindle Customer

    Our hot water pipes run through a concrete slab so it would take 2 – 3 minutes to get hot water to the kitchen sink. That time has been reduced to 3 seconds. Connecting this heater to the existing hot water line plumbing was pretty simple. I did buy all new fittings at Lowes for about $25-$30 dollars. I bought longer than needed hoses so that the heater could be removed from under the sink without removing the hoses. So far I know at least two of my neighbors who are installing the heater as well. BTW, even on the “economy” setting the water can get really, really hot so we keep it somewhat lower than that. Howerver, if we have really greasy, oily pots and pans to wash we just turn up the temperature on the heater before we eat and the water is steaming hot by the time we do the pots and pans. Then we simply turn the temp back down to our usual setting. Nice to have that sort of control.

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