---
product_id: 366512038
title: "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"
brand: "airthereal"
price: "4396 kr"
currency: DKK
in_stock: true
reviews_count: 8
category: "Airthereal"
url: https://www.desertcart.dk/products/366512038-airthereal-electric-tankless-water-heater-18kw-240volts-endless-on-demand
store_origin: DK
region: Denmark
---

# 18kW powerful heating up to 50% energy savings compact wall-mount design 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

**Brand:** airthereal
**Price:** 4396 kr
**Availability:** ✅ In Stock

## Summary

> 🔥 Hot water on demand, energy in command!

## Quick Answers

- **What is this?** 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 by airthereal
- **How much does it cost?** 4396 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/366512038-airthereal-electric-tankless-water-heater-18kw-240volts-endless-on-demand)

## Best For

- airthereal enthusiasts

## Why This Product

- Trusted airthereal brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safety-First Technology:** Equipped with dry heating, overheat, and electrical leakage protection for peace of mind.
- • **Space-Saving Wall Mount:** Takes up 90% less space than traditional tanks—ideal for modern, minimalist homes.
- • **Easy Pro-Level Installation:** Plug-and-play design with clear specs for quick setup—upgrade your home hassle-free.
- • **Endless Hot Water, Zero Wait:** Never run out of hot water again—perfect for back-to-back showers without compromise.
- • **Energy Smart Self-Modulation:** Heats water only when you need it, slashing your energy bills by up to 50%.

## Overview

The Airthereal Electric Tankless Water Heater 18kW delivers endless on-demand hot water with a compact, wall-mounted design that saves 90% space. Its self-modulating technology reduces energy consumption by up to 50%, heating water only when needed. Designed for safety with multiple protections, it supports two simultaneous showers and requires a 240V power supply with 2x40 AMP breakers. Ideal for millennials seeking efficient, stylish, and reliable home upgrades.

## Description

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 - desertcart.com

Review: I will do business with them again in the future!!! - 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!!
Review: It works. Easy install. Light weight. Impressive for the price! - 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.

## 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 don’t 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | AIRTHEREAL |
| Capacity | 240 Gallons |
| Color | Black |
| Power Source | AC |
| Product Dimensions | 12.25"W x 17.25"H |
| Special Feature | Dry Combustion Protection, Integrated Error Code Indicator , LED Display, Overheat Protection |

## Product Details

- **Brand:** AIRTHEREAL
- **Capacity:** 240 Gallons
- **Power Source:** AC
- **Product Dimensions:** 12.25"W x 17.25"H
- **Special Feature:** Dry Combustion Protection, Integrated Error Code Indicator, LED Display, Overheat Protection

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/617RdwzOTEL.jpg)
![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 - Image 2](https://m.media-amazon.com/images/I/71Oqc8YX4yL.jpg)
![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 - Image 3](https://m.media-amazon.com/images/I/71Y9x57-y-L.jpg)
![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 - Image 4](https://m.media-amazon.com/images/I/71g412T2biL.jpg)
![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 - Image 5](https://m.media-amazon.com/images/I/71hbfBdVVrL.jpg)

## Available Options

This product comes in different **Model** options.

## Questions & Answers

**Q: Can this be used for HE washing machine?**
A: Yes run the temp around 127 degrees and you can us it on a 3 bed 2 bath without dropping heat I will tell you you CANNOT run the washer and shower at the same time

**Q: I installed your unit and it gave me a error message. I wrote to the seller and had not reply???**
A: Did you dismantle it at all?  I put the little white cartridge in upside down and had a problem, but turned it over and it ran fine.  You might want to check what error message it was and maybe we can help a bit better.

**Q: Can I put a plug on it without have to wire it in?**
A: Install to manufactures spec or you will void your warranty.

**Q: I have well water that comes in cold around 52 -57 during the winter months, Would this work for a dog bath tub?**
A: Should be ok. 
Airthereal Electric Tankless Water Heater 14kW, set the outlet temp. 108°F:
- Inlet water Temp 41°F, 1.4GPM (Kitchen Faucet)
- Inlet water Temp 50°F, 1.6GPM (Kitchen Faucet)
- Inlet water Temp 59°F, 1.9GPM (Kitchen Faucet/Shower)
- Inlet water Temp 68°F, 2.3GPM (Shower)
- Inlet water Temp 77°F, 2.4GPM (Shower)

## Customer Reviews

### ⭐⭐⭐⭐⭐ I will do business with them again in the future!!!
*by E***Y on January 19, 2022*

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!!

### ⭐⭐⭐⭐⭐ It works. Easy install. Light weight. Impressive for the price!
*by R***S on September 7, 2025*

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.

### ⭐ Requires manual restart after every power flicker or outage
*by A***B on April 23, 2024*

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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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-01-27*