Airthereal EVT-27K 27kW Electric Tankless Water Heater

Introduction

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Components

Outward View

The outward view of the Airthereal EVT-27K shows the following components:

• Front Cover
• Control Key
• LED Display
• Cable Entry
• Hot Water Outlet
• Cold Water Inlet

Diagram Description: A diagram shows the front of the water heater with labels pointing to the Front Cover, Control Key, LED Display, Cable Entry, Hot Water Outlet, and Cold Water Inlet. The LED Display shows example readings: "8.8" for water flow (GPM), "888" for inlet temperature (°F), and "HEATING" status.

Product Inner Structure

The inner structure of the water heater includes:

• Thermostat
• Heating Element
• Triac
• Transformer
• Water Flow Meter

Diagram Description: An internal diagram illustrates the placement of the Thermostat, Heating Element, Triac, Transformer, and Water Flow Meter within the unit.

Electrical Diagram

Diagram Description: The electrical diagram shows the connections for the unit. It includes GND, L1, L2, L2', L1', L2", L1" power inputs connected to a Control PCB and a Main PCB. The Main PCB connects to a Temperature limiter, Heater, Triacs (Triac1, Triac2, Triac3), Flow sensor, Water temp sensor, and High temp sensor.

Connection Board

The connection board diagram shows various connection points:

• DISP: Connection plug to display
• FLOW: Connection plug to the flow sensor
• IN: Connection plug to the input temperature sensor
• OUT: Connection plug to the output temperature sensor
• AC220
• SCR1, SCR2, SCR3, SCR4
• Burn record
• Overheat indicator

Specifications

Remarks: The specified wire size and circuit breaker size are for the EVT-27K unit only. For other high-power appliances, further research is recommended.

Sizing Guide

This chart helps determine gallons per minute (GPM) output based on incoming water temperature, assuming a 108°F outlet temperature.

Important Safety Instructions

WARNING: When installing or using any high voltage electrical appliance, basic safety precautions should always be followed. Never attempt to clean, install, inspect, repair, disassemble, or service this water heater without first shutting off all power to the unit at the circuit breaker box. Failure to do so can result in SERIOUS BODILY INJURY OR DEATH.

This product MUST be installed by a qualified electrician and a qualified plumber in accordance with all applicable national, state, provincial, and local electrical & plumbing codes. Read these instructions thoroughly and completely prior to installation and use. Failure to do so could cause property damage, serious injury, or death. This manual should be given to the homeowner after installation and retained for future reference.

General Safety

• Risk of Fire: DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. Keep rags and other combustibles away.
• FOR HOUSEHOLD, INDOOR USE ONLY.
• Risk of electric shock: CONNECT ONLY TO A CIRCUIT THAT IS PROTECTED BY A GROUND-FAULT CIRCUIT INTERRUPTER (GFCI).
• This appliance MUST be permanently connected to a fixed double pole circuit breaker and installed vertically. DO NOT install near tinder or a strong magnetic field.
• If a wire is damaged, contact a qualified electrician for replacement.
• The minimum environmental temperature for safe storage and operation is above 33°F (0.5°C). Lower temperatures may cause damage and dangerous conditions.
• DO NOT switch on the appliance if it is suspected to be frozen. Wait until it has completely thawed out.
• DO NOT install this hot water unit in a location subject to freezing temperatures. Ignoring this warning may result in PERMANENT DAMAGE DUE TO INTERNAL COMPONENTS FREEZING.

Water Temperature Safety

Safety and energy conservation are key when setting the water temperature. Water temperatures above 125°F (52°C) can cause severe burns or death from scalding. Always read and follow the warnings.

Diagram Description: A graphic shows a hand being burned by hot water from a faucet, with the word "BURN" and "HOT" indicated. Text explains that water temperature over 125°F can cause severe burns or death. Children, disabled, and elderly individuals are at highest risk. Users should feel water before bathing or showering. If the unit has been paused, run water for a few seconds to stabilize temperature.

DANGER: Households with small children, disabled, or elderly persons may require a 120°F (49°C) or lower thermostat setting to prevent contact with overly "HOT" water. The water heater's temperature is regulated by the electronic control on the front panel.

Notice: Mixing valves are recommended for reducing point-of-use water temperature by mixing hot and cold water. A mixing valve complying with the Standard for Temperature Actuated Mixing Valves for Hot Water Distribution Systems is recommended.

Installation Guideline

Mounting

Step 1: Locate the installation position. Place the bracket on the wall and mark screw hole locations, ensuring outlet and inlet point downward vertically.

Diagram Description: A diagram shows a wall with a bracket being positioned, and a measurement of 12.08 inches indicated. A pencil is shown marking screw holes.

Step 2: Drill four 0.24" (6mm) diameter holes on the wall. Insert plastic anchors into the holes.

Diagram Description: A diagram shows a drill creating holes in a wall, and plastic anchors being inserted into these holes.

Step 3: Place the bracket onto the wall and drill mounting screws directly into the plastic anchors to secure the bracket.

Diagram Description: A diagram shows screws being driven through the bracket into the wall anchors. The screw type "ST 4.2*30mm" is indicated.

Step 4: Hang the water heater onto the bracket with the outlet and inlet pointed downward. Ensure the water heater is secure.

Diagram Description: A diagram shows the water heater being hung onto the mounted bracket.

Plumbing Connections

ATTENTION:

• Installation by a licensed and qualified plumber is recommended, following all applicable codes.
• Ensure no impurities in the waterway. A water softener is recommended to prevent scaling and prolong service life.
• Turn on the water source and let water flow for 2-3 minutes to remove air and prevent scaling. This MUST be done before powering on to avoid severe damage to the heating element.
• When connecting pipes, use a wrench to hold the unit's connection point and another to tighten the flexible hose. Avoid over-tightening.
• A manual shut-off valve at the inlet is recommended for easy maintenance.
• This product does not use a storage tank, so a temperature-pressure relief valve is generally not required.
• Use 3/4"NPT water connections for the EVT-27K.
• Never use PVC on the hot water outlet; use CPVC or other high-temperature-rated materials.

Installation Steps:

Step 1: Flush pipes with water to remove debris before connections. Ensure water supply is turned OFF at the shut-off valve after flushing.

Step 2: Remove and discard thread protectors. Use 3/4"NPT connections; a Pipe Fitting Adapter (not provided) may be needed if it doesn't fit.

Connect the inlet cold water line to the cold inlet fitting, ensuring the filter is installed first.

Connect the outlet hot water line to the hot outlet fitting.

Do not mistake the water inlet and outlet.

Diagram Description: Images show a shut-off valve (OFF), a 3/4" NPT Female Adapter, and labels for Water Outlet and Water Inlet. Another image shows a Gasket and a Filter.

ATTENTION: The filter prevents particles from clogging or damaging internal parts. If blocked, the machine will stop working.

Step 3: Open the shut-off valve to allow water flow. Check for leaks at plumbing connections and tighten gently if needed. Turn on the hot water faucet and let water run through the heater to purge air from lines. This MUST be done before powering on to prevent permanent damage to heating elements. Check again for leaks.

Diagram Description: An image shows the rear of the water heater with plumbing connections.

Electrical Connections

ATTENTION:

• Ensure the breaker is OFF before installing wires to avoid electric shock. All mounting and plumbing must be completed before electrical connections.
• All electrical work must comply with national, state, and local electrical codes.
• This water heater must be permanently connected to a direct main breaker panel. A plug and socket for power is forbidden.
• The heater requires its own independent electrical circuit with a fuse box or switch (breaker).
• All units must connect to a properly grounded dedicated branch circuit with the correct voltage rating.

Step 1: Remove the front shell of the water heater. Be careful not to damage the screen wiring.

Step 2: Loosen clamp screws and slide the cable through the clamp.

Diagram Description: An image shows a clamp mechanism with a cable passing through it. Labels "出水口" (Outlet) and "进水口" (Inlet) are visible.

Step 3: This unit should be installed by a qualified professional per codes.

DANGER: Confirm your breaker panel meets specifications: 27kW requires 240V, 3x 40A Double Pole Circuit Breaker, 3x 8AWG/2 Wires. If infrastructure is incorrect, a professional is needed for new outlets, breakers, or wiring.

WARNING: Under no circumstances should you attempt to clean, install, inspect, repair, disassemble, or service this water heater without first shutting off all power to the unit at the circuit breaker box. Serious bodily injury or death could occur if you ignore this warning.

Wiring: Use 3x8 AWG Wire. L1: Neutral wire (black), L2: Live wire (red). Connect each wire pair to one breaker. Use suitable wire gauge per electrical codes. A separate ground conductor is required.

Diagram Description: Images show a circuit breaker panel with 40A breakers and a close-up of wiring connections within the heater unit.

Step 4: Double-check electrical connections for correctness and tightness.

Diagram Description: An image shows the internal electrical connections after wiring.

Step 5: Tighten clamp screws. Secure the panel with screws.

Diagram Description: An image shows the final assembly of the panel cover.

Operating Instructions

CAUTION: Wait until water is fully flowing through the heater before turning on the breaker.

1. Allow water to flow continuously through the unit to flush out debris and purge air from pipes.
2. Turn on the breaker to power the heater. A beep sound and LED display will activate. The appliance stays in standby if no other display appears.
3. Press the power button ⏻ on the unit to turn it ON/OFF. When working, LED lights show the Actual Temp.
4. Press + and - buttons to adjust outlet water temperature. The range is 86-131°F (30-55°C). The heating icon ? lights up when heating.
5. Caution: If the unit was paused, there may be an initial burst of very hot water. Allow water to flow for a few moments to settle the temperature. Always test water temperature before use.
6. If the unit will not be used during winter, drain it completely to prevent freezing.
7. Periodically clean the water heater's inlet strainer, faucet aerator, and shower head to ensure free water flow.

Cleaning and Normal Maintenance

Cleaning Steps

1. Open the water inlet and remove the filter with tweezers.
2. Take out the circlip.
3. Take out the water flow rotor.
4. Clean the water flow rotor and filter.

Diagram Description: Images show the removal of a filter and circlip, and the water flow rotor.

Installation Steps (for Water Flow Rotor/Filter)

1. Install the water flow rotor into the copper head of the water inlet. Ensure the rounded bump on the rotor faces inward.
2. After installing the circlip, plug in the filter. Installation is complete.

Diagram Description: An image shows the water flow rotor being inserted into the water inlet, with a "Runded Bump" indicated. Another image shows the filter being plugged in. Text labels "Water Flow Rotor".

Normal Maintenance

Note: Do not attempt to repair this water heater yourself. Call a technician for assistance. Always shut off power before performing maintenance.

To ensure consistent performance:

• Periodically remove scale and dirt from faucet aerators and shower heads.
• Clean the built-in inlet filter. Cut water supply, reverse inlet/outlet pipe connections, open faucet to flush filter. Remember to reverse pipes afterward.
• If the water heater is unused for over 3 months, clean the water inlet waterway first (with power off). This prevents oxidation and dirty water. Air and impurities must be removed before use.

Important Note:

• Maintenance may introduce air into pipes. Purge all air before powering on to prevent serious damage to the heating element.
• If you have hard water (high mineralization), increase maintenance frequency. Check descaler device functionality.
• Do not use paint thinner, alcohol, petrol, or chemical solutions. Use a damp cloth with mild detergent.

Controls

The control panel features an LED display and buttons for operation.

Diagram Description: The control panel display is shown with example readings: "8.8" (WATER GPM), "888" (INLET TEMP), "HEATING" status, and power consumption. Icons for Power, Increase, Decrease, Mode, Inlet Temp, Power Consumption, Water Flow, Over Flow, and Heating are depicted next to their descriptions.

Troubleshooting

Malfunction Code

Limited Warranty

Airthereal warrants all Electric Tankless Water Heaters for 1 year for the main unit and warrants the Mainboard, relay, Led display, heating element, and other major parts for 3 years from the date of purchase. For more information please visit www.airthereal.com/warranty.

What's covered?

Defects due to faulty materials and/or workmanship of the product.

What's NOT covered?

1. Damage caused by the owner when attempting to fix or alter the product by himself or herself.
2. Damage caused by misuse, abuse, neglect, alterations, or unauthorized repair.
3. Natural depreciation.

Warranty Period

Warranty becomes effective from the date of original purchase and will last for 1 year.

Who's covered?

This limited warranty is only effective for the original purchaser. It is non-transferable.

How to request warranty services?

To obtain the benefit of this warranty, please email support@airthereal.com. Our customer service team will address your issue as soon as possible!

WARNING Cancer and Reproductive Harm www.p65warnings.ca.gov