Tankless Water Heater Installation Checklist: Ensuring Efficiency and Safety

Tankless Water Heater Installation Checklist: Ensuring Efficiency and Safety

--Tankless water heaters have gained immense popularity in recent years due to their energy efficiency and endless hot water supply. If you're considering installing one in your home, it's important to follow a comprehensive checklist to ensure a seamless and safe installation process. This blog will guide you through the essential steps and considerations for tankless water heater installation.

Determine the Right Location

The first step in tankless water heater installation is choosing the right location. Consider the following factors:

  • a. Proximity to Gas and Water Lines: Ensure the installation site is near existing gas and water lines to minimize additional plumbing and gas line installation costs.

  • b. Ventilation: Tankless water heaters require proper ventilation to expel exhaust gases safely. Consult local building codes for specific ventilation requirements.

  • c. Space: Tankless units are compact, but they still require sufficient space. Ensure there's enough room for the unit itself and proper clearance for maintenance.

Calculate the Proper Size

Selecting the right-sized tankless water heater is crucial for efficiency. Factors to consider include:

  • a. Flow Rate: Determine the peak hot water demand in your household. This includes the number of fixtures and appliances running simultaneously.

  • b. Temperature Rise: Calculate the required temperature rise – the difference between the incoming water temperature and your desired hot water temperature.

  • c. Manufacturer Recommendations: Consult the manufacturer's guidelines to find a unit that matches your requirements.

Gas and Electric Requirements

Depending on your choice of tankless water heater (gas or electric), you'll need to meet specific requirements:

Gas tankless water heaters

Electric tankless water heaters

  • a. Gas Line: Verify if your gas line can support the new unit's BTU (British Thermal Unit) rating. If not, you may need to upgrade the gas line.

  • b. Electrical Capacity: Ensure your electrical panel can handle the amperage required for an electric tankless heater.

Plumbing Considerations

Proper plumbing is essential for tankless water heater installation:

  • a. Water Inlet and Outlet: Install shut-off valves and unions to make future maintenance easier.

  • b. Water Quality: Consider installing a water softener or descaler to prevent mineral buildup in the unit.

  • c. Drain Pan: Place a drain pan underneath the unit to catch any potential leaks.

Venting System

For gas tankless water heaters, an appropriate venting system is crucial:

  • a. Vent Material: Choose the correct vent material (stainless steel or PVC) based on your heater's specifications.

  • b. Venting Path: Ensure the venting path complies with local building codes and is free of obstructions.

Professional Installation

While some DIY enthusiasts may be tempted to install a tankless water heater themselves, it's strongly recommended to hire a licensed plumber or HVAC technician. They have the expertise to ensure a safe and compliant installation.

Testing and Inspection

After installation, the technician should perform a series of tests to confirm the unit's proper operation. These tests typically include:

  • a. Checking for gas leaks (for gas units).

  • b. Measuring water temperature at various fixtures.

  • c. Verifying proper venting and exhaust.


Installing a tankless water heater can significantly improve energy efficiency and provide endless hot water. However, it's vital to follow a thorough installation checklist to ensure safety and performance. By considering factors like location, size, gas or electrical requirements, plumbing, venting, and professional installation, you'll enjoy the benefits of your tankless water heater for years to come. Always consult with a licensed professional to guarantee a successful installation.

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