How To Install a Hot Water Recirculation Pump

Are you tired of waiting for hot water to reach your faucets? Installing a hot water recirculation pump can solve this problem, providing instant hot water and reducing water waste. In this article, we’ll explore the benefits of hot water recirculation pumps and guide you through the installation process. In the video above, This Old House plumbing and heating expert Richard Trethewey demonstrates how to install a recirculation pump to deliver hot water on demand.

What Are Hot Water Recirculation Pumps?

Hot water recirculation pumps are designed to circulate hot water through your plumbing system to ensure that hot water is readily available at your faucets. These pumps can be installed in various locations, depending on your home’s plumbing layout and your needs. The cost of a hot water recirculating system is typically between $200 and $400, according to Angi.

How Do Recirculation Pumps Work?

A hot water recirculation pump works by creating a loop in your plumbing system. When activated, the pump pulls hot water from the water heater and pushes it through the hot water pipes. Instead of letting the cooled water in the pipes go down the drain, the pump redirects it back to the water heater through the cold water line. This process continues until hot water reaches the faucet, at which point a temperature sensor shuts off the pump.

A key feature of this system is the use of sensors. These sensors detect the water temperature and ensure the pump runs only when necessary. This optimizes energy consumption and prolongs the lifespan of the pump.

What Are the Benefits of Installing a Recirculation Pump?

Installing a hot water recirculation pump offers several benefits:

• Instant hot water: Recirculation pumps provide faster hot water, so you don’t have to wait long for hot water to reach your faucets.
• Water conservation: These add-ons reduce water waste by eliminating the need to run taps until hot water arrives.
• Energy efficiency: They can lower energy costs by reducing the workload on your water heater. This reduces your home’s environmental impact.

Choosing the Right Recirculation Pump

There are two main types of hot water recirculation pumps: full and comfort systems. 

• Full recirculation systems: Full recirculation systems provide the highest efficiency and fastest delivery of hot water. They are ideal for newly constructed homes or for significant remodeling projects where opening walls is manageable. These systems require a dedicated return line, which loops back to the water heater to ensure that cooled water is continuously recirculated.
• Comfort systems: Comfort systems are designed to retrofit existing plumbing without significant alterations. They use the cold water line as a return path. However, they may be less efficient than full recirculation systems. Comfort systems are a more practical solution for existing homes where minimal disruption is preferred.

Hot Water Recirculation Pump Installation Process

Installing a hot water recirculation pump can be a DIY project for those with basic plumbing skills. If you’re unsure about any part of the process, consult a professional plumber. Start by gathering the tools you’ll need before proceeding to the steps Trethewey demonstrates in the video.

Tools and Materials

Before beginning the installation, gather the following tools and materials:

• Adjustable wrench
• Close-quarters hacksaw
• Drill/driver with a 3/4-inch spade bit
• Hot water recirculation pump kit
• Pliers
• Safety gloves and goggles
• Screwdriver set
• Teflon tape

Step-by-Step Installation Guide

Follow these steps to install your hot water recirculation pump:

1. Turn off the water supply to your home at the main shutoff valve. Ensure all faucets are turned off to prevent water flow during the installation.
2. Locate the hot and cold water lines under the sink where you plan to install the pump. Clear the area and lay down a towel to catch any water that might spill.
3. Remove the existing shutoff valves on both the hot and cold water lines using a mini hacksaw.
4. Install the T-fittings provided in the pump kit to both the hot and cold water pipes.
5. Connect new shutoff valves and water supply lines to the T-fittings leading up to the faucet. Ensure all connections are secure, and use Teflon tape to prevent leaks.
6. Attach the recirculation pump to the T-fittings using the provided flexible braided stainless steel hoses. Confirm that the pump is correctly oriented according to the manufacturer’s instructions.
7. Secure the pump to the base of the vanity using screws. Double-check that the pump is stable and won’t vibrate excessively during operation.
8. Drill a 3/4-inch hole in the side of the vanity for the pump’s on/off button. Position the button for convenient access.
9. Install the button and connect its wiring to the pump. Follow the wiring diagram provided in the kit for proper connections.
10. Turn the water supply back on and check for leaks. Open the faucets to allow any trapped air to escape from the pipes.
11. Plug the pump into a nearby electrical outlet. Ensure the outlet can handle the pump’s electrical load.
12. Test the system by pressing the on/off button and checking for hot water at the faucet. Observe the pump’s operation and listen for any unusual noises.

To maximize the effectiveness of your hot water recirculation pump, consider installing one in a central location within your home. This reduces the distance hot water must travel to reach various faucets and further improves efficiency.

Maximizing Hot Water Recirculation Pump Efficiency

To get the most out of your hot water recirculation pump, consider these tips for optimal performance and energy efficiency.

Setting Up a Timer

Some recirculation pumps come with built-in timers or can be connected to external timers. Setting the pump to operate only during peak usage times can reduce energy consumption while still providing the convenience of instant hot water when you need it. Programmable timers allow you to customize the pump’s schedule based on your household’s routines.

Insulating Hot Water Pipes

Insulating your hot water pipes can help maintain water temperature and reduce heat loss. This also helps prevent burst pipes in the winter, which can cause serious water damage. Even during the warmer seasons, non-heated areas like basements or crawl spaces can benefit from insulation. Insulating sleeves or wraps can be easily installed on existing pipes and provide an extra layer of energy savings.

Regular Maintenance

To ensure your recirculation pump continues to operate efficiently, practice the following regular maintenance tasks:

• Check for leaks periodically.
• Clean or replace filters as recommended by the manufacturer.
• Flush the system if you notice a decrease in performance.
• Follow the manufacturer’s maintenance schedule to prolong the life of your pump.
• Inspect electrical connections annually.

Troubleshooting Common Recirculation Pump Issues

Even with proper installation and maintenance, you may encounter some issues with your hot water recirculation pump. Here are some common problems and how to handle them:

• Frequent cycling: Adjust the temperature sensor or timer settings to reduce unnecessary pump activation. Ensure the sensor is placed correctly and not exposed to drafts or other temperature fluctuations.
• No hot water at the tap: Verify that the pump is running and that there are no blockages in the pipes. Ensure the water heater is operating correctly and set to the appropriate temperature.
• Pump not turning on: Check the power supply and ensure the pump is plugged in securely. Verify that the on/off button and any connected timers or sensors are functioning correctly.
• Unusual noises: Air in the system can cause noise. Try bleeding the air from the pipes by running the faucets for a few minutes. If the noise persists, check for loose fittings and secure them as needed.