• Airthereal Electric Tankless Water Heater 27kW, 240 Volts, Endless On-Demand Hot Water, Self Modulates to Save Energy Use, Small Enough to Install Anywhere, Evening Tide series
  • Airthereal Electric Tankless Water Heater 27kW, 240 Volts, Endless On-Demand Hot Water, Self Modulates to Save Energy Use, Small Enough to Install Anywhere, Evening Tide series
  • Airthereal Electric Tankless Water Heater 27kW, 240 Volts, Endless On-Demand Hot Water, Self Modulates to Save Energy Use, Small Enough to Install Anywhere, Evening Tide series
  • Airthereal Electric Tankless Water Heater 27kW, 240 Volts, Endless On-Demand Hot Water, Self Modulates to Save Energy Use, Small Enough to Install Anywhere, Evening Tide series
  • Airthereal Electric Tankless Water Heater 27kW, 240 Volts, Endless On-Demand Hot Water, Self Modulates to Save Energy Use, Small Enough to Install Anywhere, Evening Tide series
  • Airthereal Electric Tankless Water Heater 27kW, 240 Volts, Endless On-Demand Hot Water, Self Modulates to Save Energy Use, Small Enough to Install Anywhere, Evening Tide series
  • Airthereal Electric Tankless Water Heater 27kW, 240 Volts, Endless On-Demand Hot Water, Self Modulates to Save Energy Use, Small Enough to Install Anywhere, Evening Tide series
  • Airthereal Electric Tankless Water Heater 27kW, 240 Volts, Endless On-Demand Hot Water, Self Modulates to Save Energy Use, Small Enough to Install Anywhere, Evening Tide series
  • Airthereal Electric Tankless Water Heater 27kW, 240 Volts, Endless On-Demand Hot Water, Self Modulates to Save Energy Use, Small Enough to Install Anywhere, Evening Tide series
  • Airthereal Electric Tankless Water Heater 27kW, 240 Volts, Endless On-Demand Hot Water, Self Modulates to Save Energy Use, Small Enough to Install Anywhere, Evening Tide series
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27 kW Electric Tankless Water Heater

27 kW Electric Tankless Water Heater

4.0 (164 reviews)
$279.99 USD
$279.99 USD $279.99 USD
Now $251.99 USD
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▶ Which electric tankless water heater size is right for you? Learn More.

▶ How to install a water heater? Learn More.

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Description
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What Is a Tankless Water Heater?

A tankless water heater heats up water on demand instead of storing heated water in a storage tank. Due to its short heating time, tankless water heaters are perfect for cooking areas, additional bathrooms, or any place where water needs to be used at any time. Also, because of its rapid heating and small size, our tankless water heaters are 90% smaller than a traditional water heater.

How are “Traditional” Tank Storage Water Heaters Different?

Airthereal
Tankless Water Heater
Size
Less space to install
Power Supply
8kW-27kW
Performance
Unlimited hot water
Energy Use
Only heats water on demand
Installation
Can be installed as long as the cold and hot water pipe channels are arranged in advance.
Cleaning & Maintenance
Non-scaling, so no special maintenance is required.
Airthereal
Tank Water Heater
Size
Need quite a bit of room to install
Power Supply
1.5kW-3kW
Performance
Only holds a set amount of hot water
Energy Use
Holds heated water all-day
Installation
Needs to be installed on the load-bearing wall.
Cleaning & Maintenance
Must flush tank twice a year to remove sediment and mineral scale.

Endless Hot Water
Compact Size
Saves Money
Safe to Use

Endless, on-demand hot water

Provide endless hot water on demand with no preheating or sudden temperature fluctuations.

Save 50% on water heating costs

The self-modulating temperature technology only uses energy to heat up water while you are using it.

Safe Hot Water Supply

High Temperature Protection
Dry Heating Protection
Electrical Discharge Protection
Corrosion-Proof Parts
An upgraded LED control panel for a water heating system displaying various temperatures, modes, and water flow information. An upgraded LED control panel for a water heating system displaying various temperatures, modes, and water flow information.
Upgraded LED Control Panel
Inlet water temperature/ Power consumption
Inlet water temperature
Power consumption
Water flow

Check your unit capacity

Match your location color on the map to the corresponding chart below to determine unit capacity.
STEP 1
Determine your average inlet water temperature by finding your location on the map and noting the color.
A color-coded temperature map of the United States, including Alaska and Hawaii, indicating varying climate zones ranging from 42°F to 77°F. A color-coded temperature map of the United States, including Alaska and Hawaii, indicating varying climate zones ranging from 42°F to 77°F.
STEP 2
Determine how many applications your tankless water heater can run simultaneously by matching your color to the table above.
Airthereal
Airthereal
Airthereal
Airthereal
STEP 3
Check that you can meet the installation specifications and requirements for the model of tankless heater you selected.
Product Requires:
  • 3x 40A Double Pole Circuit Breaker
  • 3x 8AWG/2 Wires
Airthereal
Airthereal
Airthereal
Airthereal
Airthereal
Airthereal

Specification

Airthereal Electric Tankless Water Heater, 8kW, 240 Volts - Endless On-Demand Hot Water - Self Modulates to Save Energy Use - for Faucet and Sink, Evening Tide series 8 kW Electric Tankless Water Heater
Airthereal Electric Tankless Water Heater, 9kW, 240Volts - Endless On-Demand Hot Water - Self Modulates to Save Energy Use - for Sink and Faucet, Evening Tide series 9 kW Electric Tankless Water Heater
Airthereal Electric Tankless Water Heater 14kW, 240Volts - Endless On-Demand Hot Water - Self Modulates to Save Energy Use - Small Enough to Install Anywhere - for 1 Shower, Evening Tide series 14 kW Electric Tankless Water Heater
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 18 kW Electric Tankless Water Heater
Airthereal Electric Tankless Water Heater 27kW, 240 Volts, Endless On-Demand Hot Water, Self Modulates to Save Energy Use, Small Enough to Install Anywhere, Evening Tide series 27 kW Electric Tankless Water Heater
Model EVT-8K EVT-9K EVT-14K EVT-18K EVT-27K
Voltage 240 V 240 V 240 V 240 V 240 V
Power 8 KW 9 KW 14 KW 18 KW 27 KW
Min. Required Circuit Breaker Size 40 AMP 40 AMP 60 AMP 2 x 40 AMP 3 x 40 AMP
Max. Amperage 33.3 A 37.5 A 58 A 75 A 113 A
Recommended Wire Size 8 AWG 8 AWG 6 AWG 2 x (8AWG/2) 3 x (8AWG/2)
Min. Water Flow 0.475 GPM / 1.8 L/min 0.475 GPM / 1.8 L/min 0.475 GPM / 1.8 L/min 0.475 GPM / 1.8 L/min 0.475 GPM / 1.8 L/min
Safe Operating Pressure 7.25 PSI - 108.78 PSI 7.25 PSI - 108.78 PSI 7.25 PSI - 108.78 PSI 7.25 PSI - 108.78 PSI 7.25 PSI - 108.78 PSI
Water Connections ½’’ NPT ½’’ NPT ½’’ NPT ¾’’ NPT ¾’’ NPT
Installation Wall-Mounted Wall-Mounted Wall-Mounted Wall-Mounted Wall-Mounted
Temperature Setting Digital Panel Digital Panel Digital Panel Digital Panel Digital Panel
Dimensions (LxWxH) 13.1 x 8.1 x 2.6 16.1 x 9.9 x 2.6 15.9 x 11.1 x 2.9 17.3 x 12.2 x 3.4 17.3 x 12.2 x 3.4
Weight 6.6 lbs 8.8 lbs 12.8 lbs 16.1 lbs 19.2 lbs

Why Airthereal

World-class design. Independently verified.

  • Red Dot Award · 2025
    Red Dot Award
    Revive R800 · Product Design
    Winner
  • iF Design Award · 2026
    iF Design Award
    AEH300 · 10,000+ entries · 131 jurors · Berlin
    Winner 2026
  • Amazon · Ongoing
    Amazon's Choice
    Multiple air purifier models
    Verified
  • H13 Medical Grade HEPA
  • CARB Certified
  • SGS Tested
  • AHAM Verifide®
  • TÜV Certified
  • ETL Certified
  • Energy Star
  • Climate Pledge Friendly
Founded
2018
Particle Capture
99.97%
Waste Reduction
90%
Homes Served
1M+