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How to Install a Tankless Water Heater

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published 5/15/2024

How to Install a Tankless Water Heater

Installing a tankless water heater can be a great upgrade for your home's plumbing system. Tankless water heaters provide hot water on demand, are more energy-efficient, and take up less space compared to traditional tank water heaters. Here’s a step-by-step guide to help you install a tankless water heater:

Step 1: Gather Your Tools and Materials

Before starting, make sure you have all the necessary tools and materials. You will need:

Tankless water heater unit

Mounting hardware

Pipe cutter

Wrench set


Pipe insulation

Teflon tape

Gas line (if using a gas-powered unit)

Electrical wiring supplies (if using an electric unit)

Step 2: Choose the Installation Location

Select a location for your tankless water heater that is convenient for your plumbing system and easy to access for maintenance. Ensure there is adequate ventilation if you are installing a gas-powered unit. Check local building codes to ensure compliance.

Step 3: Turn Off Utilities

Turn off the water supply and power source to your existing water heater. If you have a gas-powered unit, turn off the gas supply as well. Drain the existing water heater to prevent any spills during removal.

Step 4: Remove the Old Water Heater

Disconnect the water lines and gas or electrical connections from the old water heater. Carefully remove the old unit from its mounting location.

Step 5: Install the New Unit

Mount the tankless water heater on the wall according to the manufacturer's instructions. Use the provided mounting hardware and ensure the unit is securely attached.

Step 6: Connect Water Lines

Attach the cold water supply line to the inlet and the hot water line to the outlet of the tankless unit. Use Teflon tape on the threads to ensure a watertight seal. Insulate the pipes to maintain water temperature and prevent condensation.

Step 7: Connect Gas or Electrical Supply

For gas-powered units, connect the gas line to the water heater, ensuring all connections are tight and secure. For electric units, connect the wiring according to the manufacturer’s instructions, making sure to follow all electrical codes and safety practices.

Step 8: Ventilation (For Gas Units)

Install the venting system for gas-powered tankless water heaters. Follow the manufacturer’s guidelines for venting materials and installation procedures to ensure safe and efficient operation.

Step 9: Test the System

Turn on the water supply and check for any leaks in the plumbing connections. If there are no leaks, restore power or gas supply to the unit. Follow the manufacturer’s instructions to power on the water heater and set the desired water temperature.

Step 10: Final Checks

Once the system is running, check for proper operation and make any necessary adjustments. Ensure that hot water is being delivered to all fixtures and that there are no issues with the water heater.


Installing a tankless water heater can be a rewarding DIY project that enhances your home’s efficiency and comfort. However, if you’re unsure about any step of the process or encounter difficulties, don’t hesitate to contact a professional plumber. At Plumbing Excellence, we specialize in tankless water heater installations and can ensure your system is installed safely and correctly. Contact us today for expert assistance with all your plumbing needs in Summit and Medina counties.

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