4 Gallon Water Heater Under Sink Instant Hot Water Heaters 1500W 110V 120V Mini Tank,Under Counter Water Heater with T&P Vavle 1/2" NPT for Kitchen,Bathroom,Camper,RV,Grey
Condition: New
Buy Now, Pay Later
As low as
$20.67
/ mo
Learn more
- – 6-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Selected Option
Free shipping on this product
30-day returns
Learn more
FREE refund/replacement until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
Only 10 left in stock, order soon!
Arrives
Tuesday, Jun 2
Recently Viewed
Color: Gray
Style: 4 Gallon with T&P Valve
Features
- Rapid Hot Water Supply and Recovery-Kenuos 4 gallon water heater features a 1500W heating power and an upgraded L-shaped 316 stainless steel heating tube, enabling rapid heat conduction with a thermal efficiency of up to 98%. which makes our mini tank water heater can provide hot water in as little as 8 minutes,meeting your demand for a fast water heating solution
- Customer Friendly 4 Gallon Water Heater-Our under sink water heater comes equipped with a 3-way diverter valve that splits the water flow into two, meeting multi-point water supply needs.It also includes two 24 inch 3/4" ID to 1/2" ID adapter hoses, solving the problem of pipe compatibility with different regional specifications.Additionally,a temperature and pressure relief valve and mounting kit are provided, eliminating the need for you to purchase any extra accessories
- Safety Design and Exterior Patent-We always prioritize the safety and reliability.Kenuos mini tank water heaters have passed UL,CE,and DOE certifications.Coupled with a seamlessly welded high-strength body,enamel coating,and a temperature and pressure relief valve,making our under sink water heater leak-proof and corrosion-resistant,ensuring the safety of your person and property. and we have applied for exterior patents for all our products,meeting consumers' needs in terms of practicality and novelty
- Durable Quality And Excellent-The water tank is made of high-quality materials, such as an enamel-coated glass-lined inner tank.It not only effectively prevents water leakage but also boasts excellent thermal insulation performance, reducing heat loss and saving energy.Meanwhile, it has strong corrosion resistance,which can extend the service life of under sink water heater.High-quality insulation materials and design are adopted to reduce heat loss from the hot water in the tank, ensuring that the water temperature is maintained even when the water heater is not in use for a long time
- Large Capacity,More Uses-This 4 gallon water heater, despite its compact size, offers a relatively large hot water output. It can easily meet the hot water needs of various scenarios, such as providing enough hot water for washing dishes in a small kitchen, cleaning fruits and vegetables, or even for a quick hand - washing session in a bathroom
- Precaution 1 for This 4 Gallon Water Heater-According to the questions raised by the customer based on the picture,if the pressure relief valve is not tightened and the waterproof Tape is not needed,it may increase the change of water leakage.It is recommended that you install the pressure relief valve and tighten it.If you have any problems or malfunctions,please notify us in a timely manner, and we will provide you with thoughtful after-sales solutions
- Precaution 2 for This 4 Gallon Water Heater-When your water pressure exceeds 0.75 MPa,it may cause water leakage,which is a normal phenomenon.You need to equip the product with a pressure reducing valve and install it above the cold water outlet.Or replace a 0.9mpa T&P valve
- Precaution 3 for This 4 Gallon Water Heater-Please fill the water heater with water before turning on the power for the first time. Otherwise, the internal overheat protection function will activate and the water heater will stop working. Do not immediately fill with water at this time. Please disconnect the power and wait for 10 minutes for the stainless steel tank to cool down before refilling with water
Brand: KENUOS
Product Dimensions: 13.5"W x 13.8"H
Special Feature: Dry Combustion Protection, Easy to Install, Overheat Protection, Pressure Release Valve, Waterproof
Color: Gray
Wattage: 1500 watts
Brand: KENUOS
Product Dimensions: 13.5"W x 13.8"H
Special Feature: Dry Combustion Protection, Easy to Install, Overheat Protection, Pressure Release Valve, Waterproof
Color: Gray
Wattage: 1500 watts
Voltage: 120 Volts (AC)
Maximum Flow Rate: 0.45 Gallons Per Minute
Maximum Temperature: 149 Degrees Fahrenheit
Heat Output: 1500 Watts
Efficiency: 98%
Maximum Operating Pressure: 116 Pound per Square Inch
Mounting Type: Wall
Is Electric: Yes
Manufacturer: KENUOS
Item Depth: 13.5 inch
Manufacture Year: 2025
Part Number: KENUOS 678
Item Weight: 13.52 pounds
Item model number: SY-15
Shape: Square
Installation Method: Floor-Mounted
Special Features: Dry Combustion Protection, Easy to Install, Overheat Protection, Pressure Release Valve, Waterproof
Included Components: 24" Length 3/4" ID to 1/2" ID Adapter Hose x 2, 3-way Diverter Valve x 1, 4 Gallon Under Sink Water Heater x 1, Mounting Bracket Kit x 1, Temperature and Pressure Release Valve x 1
Batteries Included?: No
Batteries Required?: No
Date First Available: June 11, 2025
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Tuesday, Jun 2
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
Similar Products
Top Amazon Reviews
CONVENIENT SIZE FOR UNDER SINK USE The KENUOS 2.5 Gallon Instant Hot Water Heater is designed to fit easily under the sink, and it truly delivers on that front. Its compact size is perfect for small spaces – I installed it in my kitchen, and it fit neatly without taking up much room. For anyone looking to get hot water quickly without needing a full-size heater, this mini tank is a practical solution. QUICK HEATING BUT LIMITED CAPACITY With a 1500W heating element, this water heater gets the water hot pretty quickly. Within minutes, I had piping hot water available, which is impressive for its size. However, with a 2.5-gallon capacity, it’s best suited for smaller tasks, like washing dishes or rinsing produce. For extended hot water use, like filling up a larger sink or running continuously, it may run out of hot water quickly and need a bit of time to reheat. EASY INSTALLATION Installation was straightforward, and the 110V power makes it accessible for most home setups. I had everything up and running in under an hour, and it didn’t require any special tools or additional fittings beyond the basics. This makes it a great choice for a DIY installation if you’re comfortable with some basic plumbing. PERFORMANCE & EFFICIENCY For smaller applications, it performs well, delivering consistent hot water on demand. It maintains a steady temperature, and I didn’t notice any significant fluctuations while using it. However, it’s worth noting that because it’s on the smaller side, the 2.5-gallon tank is limited in terms of sustained hot water supply. VALUE FOR MONEY For the price, the KENUOS Mini Tank Water Heater is a solid choice. It’s budget-friendly, and if you’re looking for a quick, efficient hot water source under the sink, it does the job without breaking the bank. But if you have higher hot water demands, you might find the capacity a bit lacking. FINAL VERDICT Overall, the KENUOS 2.5 Gallon Instant Hot Water Heater is a compact and efficient option for point-of-use hot water in smaller areas. It’s quick, easy to install, and a great solution for small households or light kitchen tasks. Just keep in mind its limited capacity if you need a larger supply of hot water. For the price, it’s a worthwhile investment that performs well within its intended use.
...
show more
Reviewed in the United States on November 7, 2024 by Adam Smith
Color: White
Style: 4 Gallon with T&P Valve
I had already ordered one of these for the small bathroom in my husbands shop. It worked out so well, since we don't have access to hot water that far away from the house, that I ordered another unit for a dog wash project on my back patio. Installation is super simple! Literally all you need is an electrical outlet and access to a water outlet in order to use one of these tankless water heater units. You can store one away in a cabinet or leave it out in the open with it's sleek design and quit operating function. The size is perfect and they are super light as I am able to carry this and place it with no issues. It has a dial on the front which allows you to control the water temp on the fly, or you can leave it set to the desired water temp for endless flow of temperature controlled water with no heat fluctuation. What I absolutely love about these tankless water heaters is they end up paying for themselves in the end with the ability to save energy. I can tell you this for a FACT as we have had a whole house system installed for the past 12 years now. Nothing like ENDLESS hot water! We will NEVER have a hot water tank again!
...
show more
Reviewed in the United States on March 25, 2025 by The Lions Den
Color: White
Style: 4 Gallon with T&P Valve
The male pipe connection threads on the water inlet and outlet are not cut properly so you have to over tighten them to keep from leaking. The unit stopped working after 38 days of use. It did not lose water and it had power. There is no contact information for the manufacturer. IT was difficult to relay to Amazon that it should be a warranty issue as it was beyond the 30 days return period. Finally Amazon authorized the return. Unfortunately because of my limited space this was the only unit that would fit so I had to reorder the same water heater. I hope this unit will work for a longer period. If I had a choice I would not buy this water heater. DO NOT PURCHASE IF YOU HAVE SPACE FOR A DIFFERENT UNIT.
...
show more
Reviewed in the United States on August 14, 2025 by Virgina B.
Color: White
Style: 4 Gallon with T&P Valve
Easy to install. The treads on the pressure relief valve are not very tight and require several turns of teflon tape to insure no leaks and a tight fit. You will also need to go to the hardware store and buy a 1/2 inch by 1l2 faucet hose to connect from the 1l2 inch hot outlet to your 1/2 hot faucet connection. A $7 item. It come with two 3/8 X 1/2 inch hoses. I added a Y pvc dishwasher connection to my sink drain to attach the drain hose provided from the pressure relief valve should it leak. This way it drains into the sink drain the way your dishwasher would. After filling the tank making sure all air had exited the system I plugged it in and turned the temperature control knob from off to the 9 o'clock posiiton. When plugging it in a green light comes on .When turning the thermostat knob a red led comes on indicating heating. In 4-5 minutes it went off and I then turned on the hot water faucet and the water was exceptionally hot too hot to stand after only five minutes After running a few quarts of hot water the red light came back on indicating heating again and shut off after 2-3 minutes reheating the water used. I then observed that he red led did not come back on over the next 90 minutes when no water was on showing the water maintained its hot temperature. A sign of good insulation This unit heats water exceptionally fast and maintains the heat without having to come back on frequently. The 9 o'clock setting was more than adequate to provide very hot water without turning it to its highest setting . I do not know if the very high setting would cause the pressure relief valve to open. I have observed to leaks. I bought this unit also because it has an off setting. It is in a room which is often not used so this saves energy . It heat up so fast theres no need to keeep it on chronically
...
show more
Reviewed in the United States on March 13, 2025 by Goose