Tankless Small Water Heater Electric 120V 29.2Amp, ThermoMate 3500W On Demand Instant Hot Water Heater with Temperature Display for Kitchen Bathroom Sink Faucet, ETL Certified
Condition: New
Buy Now, Pay Later
As low as
$19.00
/ 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, Zip, Apple Pay, and Google Pay. 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 30-day refund/replacement
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:
In Stock.
Arrives
Monday, Aug 3
Recently Viewed
Set name: ET-3.5kW
Features
- [Instant Sink Hot Water] - 3500W 120V Draw 29.2Amp 0.4GPM-0.66GPM. MUST HARD WIRED, NO PLUG. provides on demand hot water in seconds for under / over sink faucet. Temperature setting range from 86F - 131F.
- [Self-modulating Power] - On demand water heater automatically adjust the power based on the change of inlet water flow and temperature, preventing over-heating
- [Long-lasting Quality] - Cast aluminum heating element separated from water line, significantly reducing scale, corrosion and mineral buildup. SUS 304 stainless steel water tube
- [Sleek Compact Size] - 7.9" x 6.4" x 2.5", Small water heater fit in tight places within your home or business, like under cabinets and sinks, hair salons, bar counters and hotel receptions, saving valuable storage space
- Touch control panel and digital temperature display allowing adjustment in 1 increment. Standard 1/2"NPT pipe fitting, pre-wired pigtail for easy installation, ETL Certified
- Important Note - Please verify this unit is the right size for you: 3.5kW 120V ONLY Hardwired, requiring 32A Double Pole Circuit Breaker, 10AWG min wire size and 1/2"NPT water connections
Description
thermomate ET035N3 3500kW Tankless Water Heater Electric 120V, Instant Electric Water Heater, Under Sink Water Heater with Digital Display, On Demand Hot Water heater Electric for Kitchen Bathroom Washing. Tired of waiting minutes for hot water to get to the tap and wasting all those water, ET035N small tankess water heater provides a great solution by providing hot water in seconds right at the source for sink for kitchen, bathroom, garage, restaurants and office buildings. It only require tiny space for installation, adding comfort, convenience and energy efficiency to your home.
Brand: thermomate
Power Source: 120V AC Hardwired
Product Dimensions: 6.5"W x 7.8"H
Special Feature: Leak proof heating chamber, Overheat Protection
Color: White
Power Source: 120V AC Hardwired
Special Features: Leak proof heating chamber, Overheat Protection
Wattage: 3500 watts
Voltage: 120 Volts (AC)
Flow Rate: 0.66 Gallons Per Minute
Maximum Temperature: 131 Degrees Fahrenheit
Mount Type: Wall
Is Electric: Yes
Item Dimensions W x H: 6.5"W x 7.8"H
Item Weight: 3.1 Pounds
Item Depth: 2.5inches
Material Type: Aluminum
Brand Name: thermomate
Model Number: ET035
Manufacturer: thermomate
Manufacture Year: 2025
Manufacturer Part Number: M0-35A
Included Components: mounting kit, water heater
Color: White
Style Name: 3.5kW
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Monday, Aug 3
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
- Zip Pay in 4
- Financing through Apple Pay
- Financing through Google Pay
Learn more about financing & leasing here.
Similar Products
$14/mo*
Rheem 18kW 240V Tankless Electric Water Heater, Gray
$26/mo*
Rheem 72-30-2 240V / 4500W 30 Gallon Electric Water Heater
Top Amazon Reviews
Set name: ET-18kW
***UPDATE*** Month 1 after installing the unit, my electric bill went from $350 the prior month down to $230 the following month. So this has had clear and immediate cost savings for my electrical usage. Very happy with the results! ---------------------- I wanted to replace my traditional tank water heater with an electric tankless, so I did hours of research and comparing models and options. Finally settled on this unit in the 18KW size to fit my needs. I wanted to the next higher up but my electrical panel and home service capacity made that a risk choice. However, I'm delighted at how well the 18kw model works for my whole home use-case. Thankfully due to having an EV, I already had a conveniently located sub-panel installed. All I had to do was upgrade the capacity on that sub-panel, which was as simple as buying a larger breaker and making sure the existing wiring was up to the task. Ended up taking out the old 30amp breaker the tank water heater used out of the main panel, installing a 40-amp dual pole breaker there in its place, then upgraded my sub-panel to 100amps, and finally installing the second 40-amp dual pole breaker in the sub-panel. Ran all the 8 AWG wire to the location where I wanted to mount the water heater and used an appropriate amount of conduit and secured to the wall, which for me thankfully was only about 6 feet of distance. If you have complex electrical situations happening, definitely call in a licensed electrician. At this point it was an easy install to mount the unit on the wall, secure the wiring which was intuitive, and wall labeled. I didn't find any of the wiring or instructions to be wrong or confusing so thats a plus. The moment of truth then arrived, powering on the unit and setting the desired water temperature. A few quick tests and bingo, hot water. Its not been 3 days since the install and multiple showers, laundry, running the dishwasher, etc. No issues whatsoever. In fact, this unit outperforms the tank water heater we had before. My family now reports that they have to set the faucet to a less hot position than they did previous during showers. The water flow is perfect even when both showers are running full blast. We get consistently hot water and don't have to adjust it multiple times during the course of the shower as we did with the old water heater. Overall, very happy with the performance of this unit! My application is a single story, 2 full bath home, so I wanted something that could handle two concurrent showers and the occasional hand washing or laundry running at the same time. And I'm thrilled to say that it works for me better than expected. I also love that its a newer design that separates the heating element from the water flow path, which means less maintenance and easier repairs if something goes wrong in the future. Time will tell in terms of durability, but I was impressed with the quality of the build, its well-made and appears to be a thoughtful and clean design. Other units I checked out before buying this one looked sloppy, not as well designed. I'm so glad I chose this model. Obviously do your research on your electrical capacity, sizing for your use-case, etc. All I can say is that it works for me in my whole house use-case in Central Florida. Northern cold climates may need a more powerful unit. For me, I've got no doubt this will be more efficient and save me money on my monthly electric bill compared to the old unit electrical consumption. To top it all off, I got this on Amazon Prime Day using a deal and the cost was unbeatable for what I got in this unit. Super happy, will update the review in the future should anything else happen to change my mind.
...
show more
Reviewed in the United States on October 17, 2023 by Joe
Set name: ET-24kW
So far, i'm liking this unit to its Rheem counter part... I have hard water we joke about it being liquid rock. But this unit so far has been rather nice, performs well, might take a couple seconds longer to warm up, but it gets it nice and hot.. Now its the longevity game i'm gonna see.. Looks like more electronics in this device than the rheem, but maybe they will hold up. Water flow is nice and the installation was pretty normal for the unit, 8 gauge wire etc, just wish it came preslotted for a larger single conduit to make my previous setup compatible, but after trial and error, I got it .... Its a nice small little unit, you can install it anywhere really.. I'd suggest somewhere near but far enough from the breaker panel as the wire is stupid expensive these days.. But if money isn't an issue put it where it works for you.
...
show more
Reviewed in the United States on May 12, 2026 by MicahinTN
Set name: ET-14kW
I bought this ThermoMate 14kW 240 VAC tankless water to replace a 50 gallon tank for a friend of the family that had burnt out. We tried replacing the burners, but they kept burning out, too. The wiring itself was questionable (I didn't install the old tank, I just had to try to fix it. I gave up and found this one on Amazon. Mounting was really easy due to its small size. I did have to run new #6 line, get a new StabLok 60A breaker, and create proper drains for the flush. Other than that, this was the easiest tankless install I've ever done. Their house is pretty small, so it produces the perfect amount of hot water for the single mom and disabled daughter. It functions perfectly and has great water flow. She does have a GoFund me to get help funding the replacement of all the wiring, interfaces, and circuit panels in the house. The house was wired back in the 40's, so there are no grounds to any outlets, lights, or electrical devices. She's had several electricians look at the wiring and all agree the home is a fire hazard. Even Idaho Power refuses to help to protect THEIR lines. Please DM me if you would like to help. I'll send you a link or look for "protect-letitias-home-from-fire-hazards".
...
show more
Reviewed in the United States on October 6, 2025 Reviewed in the United States on October 6, 2025 by JD Stewart
Set name: ET-3.5kW
Perhaps results vary? I read some decent reviews on this heater. Seemed like decent quality, but it only gets water hot, if you are running it AT A TRICKLE. I don't need hot water coming out like a fire hose, but I need to be able to wash my hands with it. These "cute little water heaters" are just that.... Cute. It is obvious that you are not going to get hot water through one of these at any rate of flow without using a small holding tank, OR 240v. PERIOD. Perhaps my review is not so much at this product but ANY of them in this price range with these specs. Just expecting too much.
...
show more
Reviewed in the United States on May 18, 2026 by dave burbage
Set name: ET-18kW
Good quality works very good no issues and easy to install the plumbing. But you do have to add the additional electrical circuits with cut off boxes for each 40 amp line.
Reviewed in the United States on April 11, 2026 by Gamboa
Set name: ET-18kW
I installed this water heater 13 months ago in my daughter’s house. She has a one bathroom home, and it has served well. However, a week ago, the unit stopped heating water. “HH” Is shown on the display. I immediately went online and entered a trouble ticket with Thermomate. The next day I called the customer support number and was encouraged that a person picked up almost immediately. John Is friendly, and did send me a troubleshooting pamphlet. We performed the steps on the pamphlet and let Jon know that did not fix it. After this, the issue got escalated to the support department . As the support department is overseas, I had to wait 24 hours for a reply. However, the ultimate solution was that they are sending me a new hot water heater. So they are honoring their two-year warranty. Easy service to work with, And as I said, the unit was easy to install and has worked fine.
...
show more
Reviewed in the United States on July 3, 2024 by Bo Villemain
Set name: ETH-11kW
This tankless water heater has been a great upgrade!! It saves so much space compared to my old one. I’m already noticing the benefits of having instant hot water on demand. Installation was straightforward, the controls are easy to use, and I love the LED display. It feels efficient and modern, and I’m hopeful it will also save on energy costs over time 🙏🏼 Honestly, I wish I had switched to a tankless system sooner. If you’re considering one, this is a fantastic option - both in quality and price!
...
show more
Reviewed in the United States on January 30, 2026 Reviewed in the United States on January 30, 2026 by DANAE C.
Set name: ET-3.5kW
Installed this for the kitchen sink and dishwasher. Set at 123 degrees and it's hot in 2 seconds. No issues. Never rings out of hot water.
Reviewed in the United States on April 15, 2026 by Ken from McDonough Ga