How Much Does a Tankless Water Heater Installation?

Tankless Water Heater Installation

Installing a tankless water heater can provide numerous benefits, including energy efficiency, space savings, and endless hot water on demand. Here’s a guide on how to Tankless Water Heater Installation:

Materials and Tools Needed:

  1. Tankless water heater unit
  2. Gas or electric supply line (depending on the type of tankless heater)
  3. Vent pipe (for gas tankless heaters)
  4. Exhaust pipe (for gas tankless heaters)
  5. Water shut-off valves
  6. Copper or PEX piping
  7. Gas line (if applicable)
  8. Vent termination kit (for gas tankless heaters)
  9. Pipe wrench
  10. Adjustable wrench
  11. Screwdriver
  12. Pipe cutter
  13. Teflon tape
  14. Level


  1. Select Location: Choose a suitable location for the tankless water heater. It should be close to the main water supply and gas or electric lines, if applicable, and have proper ventilation.
  2. Shut Off Utilities: Turn off the water supply and gas or electricity to the area where the tankless water heater will be installed.
  3. Mounting: Mount the tankless water heater securely to the wall using appropriate brackets and fasteners. Use a level to ensure it is properly aligned.
  4. Connect Water Lines: Connect the cold water inlet and hot water outlet lines to the corresponding ports on the tankless water heater. Use copper or PEX piping and ensure a watertight connection with proper fittings.
  5. Gas Line Connection: If installing a gas tankless water heater, connect the gas supply line to the unit. Use Teflon tape on the threaded connections and tighten securely with a wrench.
  6. Ventilation: Install the vent pipe and exhaust pipe according to the manufacturer’s instructions. Ensure proper slope and secure connections to vent the combustion gases safely outside.
  7. Electrical Connection: If installing an electric tankless water heater, connect the unit to the electrical supply according to the manufacturer’s specifications. Follow all local electrical codes and use proper wiring techniques.
  8. Water Shut-Off Valves: Install water shut-off valves on the inlet and outlet lines to the tankless water heater. This will allow for easy maintenance and servicing in the future.
  9. Testing: Turn on the water supply and gas or electricity to the tankless water heater. Check for any leaks in the water or gas lines. Follow the manufacturer’s instructions for initial startup and testing of the unit.
  10. Final Adjustments: Make any final adjustments to ensure the tankless water heater is operating correctly. Check the temperature settings and adjust as needed.
  11. Safety Precautions: Install a carbon monoxide detector near the tankless water heater, especially if it is a gas unit. Follow all safety guidelines provided by the manufacturer and local building codes.
  12. User Manual: Provide the homeowner with the user manual and instructions for operating and maintaining the tankless water heater.

If you’re not comfortable with any aspect of the installation process, it’s best to hire a professional plumber or contractor to ensure the job is done safely and correctly.