How To Install Recirculating Pump On Tankless Water Heater?

Installing a recirculating pump on a tankless water heater is a straightforward process that provides instant hot water throughout your home. Here is a step-by-step guide on how to install the recirculating pump.

First, ensure the water heater is turned off and no electricity is flowing to it. Then, locate the cold water line and install the pump on it, using the provided fittings. Connect the pump’s return line to the water heater’s cold water inlet.

Finally, plug in the pump and turn on the water heater. By following these steps, you can easily install a recirculating pump on a tankless water heater and enjoy the convenience of hot water on demand.

How To Install Recirculating Pump On Tankless Water Heater?


Why Recirculating Pumps Are Needed For Tankless Water Heaters

Enhancing Hot Water Convenience With Recirculating Pumps

Setting up a recirculating pump on a tankless water heater brings several advantages, especially when it comes to hot water convenience. This section will delve into the reasons why incorporating a recirculating pump into your tankless system can significantly enhance your overall experience.

Addressing The Issue Of Long Wait Times For Hot Water

One common problem with tankless water heaters is the time it takes for hot water to reach the faucet or showerhead. However, by installing a recirculating pump, you can eliminate this issue and enjoy the following benefits:

  • Instant hot water: With a recirculating pump, hot water is continuously circulated within the plumbing system. This means that as soon as you turn on the tap, you’ll have hot water readily available, saving you from waiting for the water to heat up.
  • Reduced water wastage: Without a recirculating pump, you may waste gallons of cold water while waiting for hot water to make its way through the pipes. By installing a pump, you can save water and contribute to environmental conservation.
  • Consistent temperatures: Recirculating pumps help maintain consistent water temperatures throughout your home. No more fluctuating temperatures during a shower or while washing dishes – the pump ensures that hot water is consistently available on demand.

Benefits Of Installing A Recirculating Pump On A Tankless Water Heater

Installing a recirculating pump on your tankless water heater offers numerous benefits, making it a worthwhile investment for any household. Here are some key advantages to consider:

  • Convenience factor: Having instant hot water at any faucet or fixture in your house adds a significant level of convenience to your daily routines. Whether you’re washing your hands, taking a shower, or doing laundry, you won’t have to endure long wait times for hot water.
  • Energy efficiency: Recirculating pumps can help reduce energy consumption. By eliminating the need to run the faucet for extended periods to get hot water, you’ll save both water and energy, leading to lower utility bills.
  • Cost-effective solution: While initially, there is an investment involved in purchasing and installing a recirculating pump, the long-term benefits outweigh the cost. The savings on your water and energy bills, as well as the convenience gained, make it a cost-effective solution in the long run.
  • Increased comfort: Waiting for hot water can be frustrating, especially during colder months. With a recirculating pump, you can enjoy instant hot water, allowing for a more comfortable living environment for you and your family.
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Installing a recirculating pump on your tankless water heater can significantly enhance your hot water experience by eliminating long wait times and improving overall convenience. Consider the benefits mentioned above and make a worthwhile investment in your home’s comfort and efficiency.

Choosing The Right Recirculating Pump

Understanding The Different Types Of Recirculating Pumps Available

Recirculating pumps are an essential component when it comes to ensuring hot water is readily available in your home. However, with the variety of options available, it’s important to understand the different types of recirculating pumps before making a choice.

Here are some key points to consider:

  • Traditional recirculating pump: This type of pump uses a dedicated return line to continuously circulate hot water through the plumbing system, ensuring near-instantaneous hot water at each fixture. It is typically installed with a dedicated return line, which can be expensive and time-consuming.
  • On-demand recirculating pump: On-demand pumps are designed to activate only when hot water is needed, eliminating the need for a dedicated return line. These pumps use a flow-activated sensor or a push-button to pump hot water quickly to the fixture. They are easier to install and more cost-effective than traditional models.

Factors To Consider When Selecting A Recirculating Pump For Your Tankless Water Heater

Choosing the right recirculating pump for your tankless water heater involves considering several factors. Here’s what you should keep in mind:

  • Water heater compatibility: Ensure that the recirculating pump you select is compatible with your tankless water heater model. Different heaters may have varying flow rates and temperature settings, so it’s essential to choose a pump that can handle the specific requirements of your heater.
  • Flow rate: The flow rate of a recirculating pump is a crucial factor to consider. It determines the speed at which hot water is pumped through the system. Check the flow rate of the pump and ensure it is suitable for your home’s hot water demands.
  • Installation requirements: Consider the installation requirements and complexity of the recirculating pump you’re considering. Some pumps may require professional installation, while others are designed for easy diy installation. Evaluate your expertise and the time you can dedicate to the installation process.
  • Noise level: Since recirculating pumps run continuously or intermittently, the noise level can be a factor to consider, especially if the pump is installed close to living areas. Look for pumps that are designed to operate quietly to ensure minimal disturbance.
  • Reliability and durability: It’s essential to choose a recirculating pump from a reliable brand that offers a warranty and has a reputation for durability. Investing in a high-quality pump can significantly reduce the chances of frequent breakdowns and repairs.

Energy Efficiency Considerations For Recirculating Pumps

When it comes to energy efficiency, recirculating pumps can have an impact on both your energy consumption and utility bills. Consider the following energy efficiency considerations:

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  • Pump technology: Look for recirculating pumps that incorporate energy-efficient technologies such as variable speed motors. These motors adjust the pump’s speed based on demand, leading to energy savings.
  • Thermal bypass valves: Some recirculating pumps feature thermal bypass valves that allow water to bypass the pump when it reaches the desired temperature. This prevents unnecessary operation of the pump, saving energy.
  • Timer controls: Timer controls are another energy-saving feature found in many recirculating pumps. They allow you to set specific periods during which the pump operates, ensuring hot water is available only when needed.
  • Insulation: Properly insulating hot water pipes helps reduce heat loss and eliminates the need for excessive recirculation. Consider insulating your hot water pipes to improve energy efficiency.

Choosing the right recirculating pump for your tankless water heater involves understanding the available options, considering factors like compatibility, flow rate, installation requirements, noise level, reliability, and durability. Additionally, prioritize energy-efficient features such as pump technology, thermal bypass valves, timer controls, and pipe insulation to minimize energy consumption and reduce utility bills.

With careful consideration, you can select a recirculating pump that meets your specific needs while optimizing hot water availability and energy efficiency.

Step-By-Step Installation Guide For Recirculating Pump On A Tankless Water Heater

Evaluating The Existing Plumbing System And Determining The Best Location For The Recirculating Pump:

Before installing a recirculating pump on your tankless water heater, it is important to evaluate your existing plumbing system and determine the best location for the pump. Here are some key points to consider:

  • Assess the layout of your plumbing system. Identify the hot water supply line and the furthest fixtures from the water heater.
  • Determine if your plumbing system has a dedicated return line or if you will need to use the cold water line as a return line.
  • Choose a suitable location for the recirculating pump. It should be close to the water heater for easy installation and maintenance.
  • Consider the noise level of the pump when selecting its location. You may want to install it in a utility room or other well-insulated area to minimize noise.

Shutting Off The Power And Water Supply To The Tankless Water Heater Before Installation:

Before installing the recirculating pump, it is crucial to shut off the power and water supply to the tankless water heater. Here’s what you need to do:

  • Locate the circuit breaker or power switch connected to the tankless water heater and turn it off to cut off the power supply.
  • Turn off the water supply valve connected to the tankless water heater to prevent any water flow during the installation process.

Connecting The Recirculating Pump To The Plumbing System And The Tankless Water Heater:

Once you have evaluated the plumbing system and shut off the power and water supply, it’s time to connect the recirculating pump to the plumbing system and the tankless water heater. Follow these steps:

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  • Identify the hot water supply line and the cold water return line. If your plumbing system has a dedicated return line, connect the pump to that line. Otherwise, connect it to the cold water line.
  • Install the pump on the selected location, ensuring that it is securely mounted.
  • Connect the pump to the hot water supply line using appropriate fittings and connectors.
  • Connect the pump to the cold water return line or the cold water line, depending on your system configuration.

Installing The Check Valves And Other Necessary Components:

To ensure proper functioning of the recirculating pump, you need to install check valves and other necessary components. Here’s what you should do:

  • Install a check valve on the hot water supply line close to the pump. This valve prevents water from flowing back into the cold water line.
  • Install another check valve on the cold water return line or the cold water line (if used as a return line), near the connection to the pump. This valve ensures water flows in the desired direction.
  • Install any other necessary components according to the manufacturer’s instructions. This may include flow control valves, pressure relief valves, or additional fittings.

Testing The Recirculating Pump And Making Necessary Adjustments:

After installing all the components, it is important to test the recirculating pump and make any necessary adjustments. Here’s how:

  • Turn on the power supply to the tankless water heater.
  • Open any hot water faucet in the house to allow water to flow through the system.
  • Activate the recirculating pump and observe the water flow. Check for any leaks or unusual noises.
  • Adjust the pump settings if needed. Some pumps have adjustable timers or temperature sensors that can be modified to suit your preferences.
  • Monitor the water recirculation and ensure it meets your expectations in terms of efficiency and convenience.

By following this step-by-step installation guide, you can successfully install a recirculating pump on your tankless water heater. Remember to adhere to the manufacturer’s instructions and consult a professional if you are unsure about any aspect of the installation process.


Installing a recirculating pump on a tankless water heater can greatly improve efficiency and convenience. By constantly circulating hot water throughout the plumbing system, you can eliminate the wait time for hot water, saving both time and water. Whether you are a homeowner looking to reduce energy consumption or a business owner looking to enhance customer experience, installing a recirculating pump is a smart choice.

With the simple steps outlined in this blog post, you can easily install a recirculating pump on your tankless water heater, allowing you to enjoy instant hot water on demand. Remember to carefully follow the manufacturer’s instructions and consult a professional if needed.

Don’t miss out on the benefits of a recirculating pump and start enjoying the convenience and efficiency it brings to your daily life. Upgrade your tankless water heater today!


I am a mechanical engineer and love doing research on different home and outdoor heating options. When I am not working, I love spending time with my family and friends. I also enjoy blogging about my findings and helping others to find the best heating options for their needs.