How To Install A Rinnai Tankless Water Heater

How To Install A Rinnai Tankless Water Heater In 10 Easy Steps

  • Tankless water heaters by Rinnai are revolutionary appliances that provide on-demand hot water without a bulky storage tank. With their cutting-edge technology and efficient design, Rinnai tankless water heaters have become increasingly popular in residential and commercial settings. These compact units are renowned for delivering a continuous hot water supply, ensuring you never run out during those peak usage times. However, learning how to install Rinnai tankless water heater is crucial if you must maximize its benefits.
  • One of the key advantages of Rinnai’s tankless water heater is its space-saving nature. Unlike traditional water heaters, which take up significant floor space, Rinnai tankless units can be conveniently mounted on the wall, freeing up valuable square footage in your home or business. This compact design also makes installation easier and more flexible, allowing you to place the unit closer to the point of use, minimizing heat loss and reducing energy consumption.

In addition to their space-saving benefits, Rinnai water heaters are renowned for their energy efficiency. These units only heat water when needed, eliminating the energy wasted in maintaining a constantly heated tank. Rinnai tankless water heater can significantly reduce energy costs and lower your carbon footprint by providing hot water on demand. Furthermore, their advanced technology ensures precise temperature control, allowing you to consistently enjoy hot water at your desired temperature.

Rinnai tankless water heaters are also highly durable and reliable, built to withstand the demands of daily use. With proper maintenance and regular servicing, these units can provide years of trouble-free operation. Rinnai takes pride in its commitment to quality and backs its tankless water heaters with comprehensive warranties, giving you peace of mind and assurance in your investment.

Overall, Rinnai tankless water heaters offer a convenient, efficient, and reliable solution for all your hot water needs. With their space-saving design, energy efficiency, and long-lasting performance, these units are an excellent choice for those seeking comfort, convenience, and sustainability.

Rinnai outdoor tankless water heater installation Vs. indoor tankless water installation? 

Outdoor Unit:

Regarding outdoor installation, Rinnai tankless water heaters are designed to withstand the elements. They are built with weather-resistant materials and protective features, allowing them to be installed outside the building. This is particularly advantageous for homeowners or businesses with limited indoor space or who prefer to keep their utility appliances outdoors. The installation involves securely mounting the unit on an exterior wall and connecting it to the necessary water and gas lines. 

Indoor Unit:

On the other hand, indoor installation requires careful consideration of ventilation requirements. Rinnai indoor tankless water heaters produce combustion gases that must be safely vented out of the building. As a result, proper ventilation is crucial to ensure the unit operates efficiently and safely. The installation involves connecting the unit to the water and gas lines and installing the appropriate venting system, such as concentric or twin-pipe venting, to direct the exhaust gases outside.

Additionally, the placement of the indoor tankless water heater should comply with local building codes and regulations. Depending on the specific requirements, it may need to be installed in a well-ventilated area, such as a utility room, basement, or garage. Proper clearance must be maintained around the unit to ensure sufficient airflow and access for servicing. This also makes it extremely easy for you to flush your Rinnai tankless water heater

Key points to Consider:

We recommend hiring a professional plumber or licensed installer familiar with Rinnai tankless water heaters in both cases. They will ensure proper installation, adherence to safety guidelines, and optimal performance by assessing your specific needs, determining the most suitable location for installation, and correctly setting up all the necessary connections and venting.

Ultimately, whether you choose an outdoor or indoor installation for your Rinnai tankless water heater depends on your space availability, preferences, and local building codes.

How to install Rinnai tankless water heater?

Installing a Rinnai tankless water heater involves several steps. To avoid any issues, it is crucial that you adhere to the following instructions diligently. In addition to learning how to install a Rinnai tankless water heater, you should also understand how to install a Rinnai recirculating pump; this makes your hot water circulation top-notch.

Step 1: Determine the installation location

Select a suitable location for your tankless water heater, considering access to water and gas lines, proximity to the point of use, and compliance with local building codes.

Step 2: Prepare the necessary connections 

Shut off the water and gas supply to your home. Install isolation valves on the water lines and a sediment trap near the unit’s gas line.

Step 3: Mount the unit securely 

Use a mounting bracket to securely attach the tankless water heater to the wall, ensuring it is level and properly aligned.

Step 4: Connect water lines 

Attach the hot and cold water supply lines to the appropriate connections on the unit. Use pipe sealant or Teflon tape to ensure a watertight seal.

Step 5: Connect the gas line 

Install a gas shut-off valve and connect the gas line to the unit using approved gas connectors. Use a gas leak detection solution to check for any leaks.

Step 6: Venting 

Install the venting system according to the manufacturer’s instructions. Follow local codes and guidelines to ensure the safe venting of combustion gases.

Step 7: Electrical connections

If your Rinnai tankless water heater requires electrical power, consult the installation manual for specific electrical requirements and follow the recommended wiring procedures.

Step 8: Test and flush the system: 

Open the water and gas supply valves and check for leaks. Turn on a hot water faucet to flush any air or debris from the system.

Step 9: Adjust settings: 

Set the desired temperature and configure additional settings, such as temperature lock or recirculation mode, per your preferences.

Step 10:  Perform a test run

Allow the tankless water heater to run for several minutes to ensure it operates smoothly and provides hot water as expected.

It is essential to consult the manufacturer’s installation manual for detailed instructions specific to your Rinnai tankless water heater model. The process of how to install a Rinnai tankless water heater may differ for different models. If you are unsure or uncomfortable with the installation process, we recommend hiring a professional plumber or licensed installer to ensure a proper and safe installation.


What are the features of a Rinnai tankless water heater?

Rinnai tankless water heaters offer on-demand hot water, space-saving design, energy efficiency, precise temperature control, durable construction, and comprehensive warranties. They provide continuous hot water, can mount on walls, reduce energy costs, offer customizable temperature settings, withstand daily use, and come with reliable warranty coverage for peace of mind.

How do I set up the electrical connection for my Rinnai tankless water heater?

To set up the electrical connection for your Rinnai tankless water heater, consult the installation manual for specific requirements. Ensure you have the appropriate electrical supply, follow recommended wiring procedures, and connect the unit to a dedicated circuit with the correct voltage and amperage rating.

What is the average lifespan of a Rinnai tankless water heater?

The average lifespan of a Rinnai tankless water heater is typically around 20 years. However, users can extend the lifespan of some units even longer by maintaining them properly, scheduling regular servicing, and adhering to usage guidelines.

How do Rinnai tankless water heaters reduce energy bills?

Tankless water heaters save energy by removing the standby heat loss typical tank water heaters face. They simply heat water as needed, eliminating the continual energy usage of maintaining a big hot water tank. This on-demand heating approach saves energy waste and utility expenses, potentially saving money on energy bills.

Which Rinnai tankless water heater can conveniently serve my needs?

One popular Rinnai tankless water heater model on Amazon is the Rinnai RL Series HE+ RL94eP Propane Tankless Water Heater. This unit offers a maximum flow rate of 9.4 gallons per minute, efficient propane fuel utilization, and advanced temperature control features.