Airthereal Electric Tankless Water Heater 18kW, 240Volts - Endless On-Demand Hot Water - Self Modulates to Save Energy Use - Small Enough to Install Anywhere - for 2 Showers, Evening Tide series
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Extended holiday returns
Returnable until Jan 31, 2026 Learn more
Returnable until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026
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Availability:
In Stock.
Arrives
Saturday, Nov 15
Model: EVT-18K
Features
- Endless Hot Water: Imagine you are the last one in your family to take a shower before heading out for the day. You turn on the faucet and the water is freezing cold. Too bad you dont have an Airthereal Electric Tankless Water to provide endless hot water on demand with no preheating, temperature fluctuations, or running out of hot water in the tank.
- Save Space: That water heater in the basement or utility closet takes up a ton of space. This wall-mounted water heater uses 90% less space than a traditional hot water heater with a tank.
- Save Energy: Water is only heated when you need it, not stored in a hot water tank. The self-modulating temperature technology only uses energy to heat up water while you are using it to save up to 50% on water heating energy compared to a typical tank water heater.
- Important Note: In order to install 18kW Electric Tankless Water Heater it requires 240 Voltage, 2 x 40 AMP Circuit Breaker Size and a set of 2 x (8AWG/2) wires. Please check to confirm that your breaker panel meet these specifications.
- Safe To Use: With high temp protection, dry heating protection, and electrical leakage protection you can rest easily knowing you have safe, on-demand hot water to use on your schedule. The electric and fluid systems are completely separated to prevent electric leakage and water pipe corrosion.
Brand: AIRTHEREAL
Product Dimensions: 12.25"W x 17.25"H
Special Feature: Dry Combustion Protection, Integrated Error Code Indicator, LED Display, Overheat Protection
Color: Black
Wattage: 18000 watts
Brand: AIRTHEREAL
Product Dimensions: 12.25"W x 17.25"H
Special Feature: Dry Combustion Protection, Integrated Error Code Indicator, LED Display, Overheat Protection
Color: Black
Wattage: 18000 watts
Voltage: 240 Volts
Heat Output: 18 Kilowatts
Efficiency: High (exact value not provided)
Style: Indoor Installation
Mounting Type: Wall
Is Electric: Yes
Manufacturer: Airthereal
UPC: 816621023836
Part Number: EVT-18K
Item Weight: 18.46 pounds
Item model number: EVT-18K
Size: 18kW
Installation Method: Wall-Mounted
Special Features: Dry Combustion Protection, Integrated Error Code Indicator, LED Display, Overheat Protection
Included Components: Electric Tankless Water Heater 18kW
Batteries Included?: No
Batteries Required?: No
Date First Available: September 13, 2021
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, Nov 15
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.
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Top Amazon Reviews
Model: EVT-9K
I purchased one of these units for my house and sold it before installing. When my brothers Water Heater went out I gifted him this unit. The concept of these "Instantanious" water heaters is that they use a lot of power when your using hot water and none when your not. Washing clothes, dishes, bathing and no appliance is maintaining 30-100 gallons of hot water 24 hours a day. It takes a while for the hot water to reach the point of use (but fairly that may be the plumbing design as I dont know how long it took with a conventional water heater), only drawback is each time the power goes out it has to be manually reset (don't know if that is true of all units or just this one). Note: I conducted a tremendous amount of research before converting to this new concept for heating water, if you flush the system out twice a year as directed, the unit should provide you many years of trouble free service. Once the initial install is made (using quick connect lines sold by Amazon), when the unit does fail, which all things due, simply close the bypass valve loosen 2 fittings and unplug (or unwire) unit, change it out and your back on line in literally 30 minutes. Remember to set up that 6-month flush schedule, a small price to pay for the great reduction in power costs. Bonus: There far better for the enviroment.
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Reviewed in the United States on October 23, 2025 by Anthony Kovaleski
Model: EVT-9K
I'm not going to lie. I expected it to be trash for how cheap it was. I even got it 'used'. Box had been opened, but it was still brand new inside. Provides pleanty of hot water for 1 person. Nice hot shower from 54°F well water. The stranded copper wire is nice & thick w/ a ferrule on the end for easy screw down. I'm tired of rheem tanks rotting just as the warranty expires. They are $500 now. I will come back to tell how well it holds up.
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Reviewed in the United States on September 7, 2025 by Richard Crosswicks Richard Crosswicks
Model: EVT-18K
As I say in all of my reviews, each product starts with 3 stars. Why? Because 3 means it met expectations, no more and no less. I add or remove stars from there based on whether I was impressed or disappointed, and on any interaction with manufacturer (not Amazon) customer service. This unit gets 1 star since it does not work as expected, nor was customer service helpful when I reached out. Yes, it is a tankless water heater and it does in fact heat your water to (as far as I can tell) the appropriate temperature. Installation was no easier or harder than other units I've installed. The issue is that it becomes inactive with any power interruption at all, whether it's an outage or even a flicker of lights. In order to get it to work again, I have to get into the crawlspace and manually press the power button; otherwise, it won't heat water. To be clear, it doesn't get fully reset - it remembers settings such as the target water temperature - it simply remains in "Standby" mode until the power button is touched. Also to be clear, while this happens with full power outages (no power) and even the kind of flickers that happen during storms or high wind or just randomly. I'm talking the kind of power blips that don't even reset the microwave or range clocks because they're so fast and minor; they do, however, cause this unit to go into permanent standby. While made more frustrating since this unit is in my crawlspace - yours might be in a closet or garage that is much easier to access - I only reduced the rating by 1 star for this. I have a 10-year old 27kW EcoSmart (since purchased by Rheem) that cost less then than this 18kW Airthereal unit does now and it doesn't have such a ridiculous design flaw. It just works. This brings me to the second star I removed and the reason for a 1-star rating: customer service. I contacted Airthereal customer service about this issue almost 2 weeks before the 30-day Amazon return window closed and they drew out their responses so long that the 30 days passed, meaning I couldn't return it. Admittedly, I could have disconnected it at any point and returned without waiting for a response from Airthereal, but I was hoping that such obviously unintentional behavior would be recognized as a functional defect that they would address with an updated control board or something, but no. I was informed that the customer service rep "consulted" with their engineering team and that the unit is functioning as designed. Just to be completely sure, I ordered a second unit 5 months after the first and tested to see if my original was in fact defective or if Airthereal had made improvements to the design. It same issue exists: any power interruption, no matter how small, causes the unit to be stuck in standby mode until the power button is touched to reset it.
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Reviewed in the United States on April 23, 2024 by avgbmb
Model: EVT-18K
Here is my 100% “gods honest” experience and i really do hope this helps people!! Sorry it’s a little long!… I decided to give the 18k evening tide a try in my home! After reading the owners manual it was simple enough to understand how to install it! (I must mention i am a handyman by trade) it took a few hours to read, pull wires, and run some plumbing. I was moving my hot water heater location from the basement to the utility room on the main floor, because otherwise it would not take nearly as long since its basically a plug and play unit!! I did have an issue… & looking back, i know my original unit was faulty out of the box… i had ordered it on cyber monday so honestly i am wondering if it was dropped in the mail… it worked for 2 weeks and crapped out… this is my first experience with tankless & no one i know has used them either… so i didn't know something was wrong initially… when it died i was sad to learn that their customer service line is only open 12-4 est & panicked a little lol…. But i found out you can email them any time and they will typically get back to you outside of that timeframe!!! They are a smaller company & so I totally understand!! Per their request I sent them a couple short videos along with some other information and i was issued a replacement!! Exactly 1 week from making initial contact with the company i had my replacement and swapped the units out. Which took abt 30 mins including cutting breakers off & on in the basement, I honestly could’ve probably coached my 10 year old through doing it!! Immediately i knew the replacement was a good unit and that the original never was!! (It goes to standby mode when the hot water is not running which makes total since!!! If you see an EF code when the water isn’t running it does not mean energy efficient lolol) Anyways, to wrap all of this all up, i am very pleased with this product and company!! I do a lot of home remodeling and honestly i will start putting these in houses that need new water heaters!! Im a single mom of 3 girls & we tend to go through some hot water… lolol this is seriously a game changer in our life!!! Everyone can shower back to back before bed and no one has to get stuck with a potentially cold one lololol its so compact and honestly not bad to look at!! *Just wanted to update* We are 3 months in with the new unit and i am beyond pleased!!! I can run a bath while the shower is running and theres never a shortage of hot water!! The only *flaw* i have found is if you only run the hot water momentarily (im talking seconds) then the unit beeps because there is no water flow to cool the jets which just fired up. Which is not actually a flaw, just how things work! So if you turn on the hot water let it run for at least 30 seconds lol i am in love with this purchase!!
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Reviewed in the United States on January 19, 2022 by Emily