Quick Guide for Airthereal 18kW Water Heater
Quick installation guide for the Airthereal 18kW water heater. Includes electrical requirements, necessary tools, and safety procedures for professional installation.
Quick answers from the manual
Quick answer
- This guide provides the electrical requirements and installation steps for the Airthereal 18kW Water Heater. p. 1
Key actions
- Turn off the power at the circuit breaker box before performing any installation or service. p. 1
- Connect each wire pair to one breaker, ensuring each breaker is connected with one black wire and one red wire. p. 1
- Install a separate ground conductor. p. 1
Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Voltage | 240V | Required electrical voltage | p. 1 |
| Circuit Breaker | 2x 40A Double Pole | Required circuit breaker configuration | p. 1 |
| Wire Gauge | 2x 8AWG/2 | Required wire size | p. 1 |
Where to find it in the PDF
- Quick Guide p. 1
Table of contents
Manual images
Click an image to enlargeQuick Guide from the manual
This document serves as a quick installation guide for the Airthereal 18kW water heater. Installation must be performed by a qualified professional in accordance with all national, state, provincial, and local electrical and plumbing codes.
Tools Required
Ensure you have the following tools available before beginning the installation:

- Voltage tester
- Screwdrivers
- Pliers
- Wire strippers
Electrical Requirements
The unit requires specific electrical infrastructure to operate safely and correctly:

- Voltage: 240V (Do not use 120V)
- Circuit Breaker: 2x 40A Double Pole Circuit Breaker
- Wiring: 2x 8AWG/2 Wires
Installation Steps
- Turn off the power at the breaker box before starting any work.
- Take each wire pair and connect them to one breaker. Ensure that each breaker is connected with one black wire and one red wire.
- Using a suitable wire gauge that meets all applicable electrical codes for the size of the breakers used, run the correct sets of wire from the main breaker panel to the tankless water heater.
- A separate ground conductor is required.
- Double-check the electrical connections to make sure they are correct and that all wire connections are tight and secure.
Safety Warnings
Warning: Under no circumstances should you attempt to clean, install, inspect, repair, disassemble, or otherwise service this water heater without first shutting off all power to the unit directly at the circuit breaker box. Serious bodily injury or death could occur if you ignore this warning. If you do not have the correct infrastructure, you will need a professional to install a new outlet, breaker, and/or wiring.
Manufacturer information
Airthereal
Practical help
Common problems
The unit requires 240V. Do not attempt to use 120V.
Double-check all wire connections to ensure they are tight and secure before turning the power back on.
Use 2x 8AWG/2 wires that meet all applicable electrical codes for the breakers used.
Before use
- Verify the power supply is 240V
- Ensure a qualified professional is performing the installation
- Confirm the breaker panel can accommodate 2x 40A Double Pole Circuit Breakers
- Gather necessary tools: voltage tester, screwdrivers, pliers, wire strippers
- Turn off power at the breaker box
Specs in practice
- 2x 40A Double Pole Circuit Breaker
- The specific circuit protection required for this unit.
- 2x 8AWG/2 Wires
- The required wire gauge for the electrical installation.
Images and diagrams
- The guide illustrates the required tools: voltage tester, screwdrivers, pliers, and wire strippers.
- The guide shows the connection of L1 (black) and L2 (red) wires to the breaker.
Model compatibility
- Installation must comply with national, state, provincial, and local electrical and plumbing codes.
- Requires a qualified professional for installation.
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.