Is it okay to connect a recirculation pump to a Takagi TK-340X3-NEH water heater for instant hot water, and what's the recommended way to do it?

Yes, it is possible to connect a recirculation pump to a Takagi TK-340X3-NEH water heater to provide instant hot water at the tap. A recirculation system helps reduce the time and water wasted waiting for hot water to reach the faucet, which is particularly beneficial in larger homes or buildings. However, it's essential to follow the recommended guidelines and best practices for a successful installation. Here's how to do it:

Recommended Steps for Connecting a Recirculation Pump to a Takagi TK-340X3-NEH Water Heater:

Choose the Right Recirculation System:
Select a suitable recirculation system that matches your water heater's capacity and your specific needs. There are two primary types of recirculation systems: dedicated return line and demand-controlled. The choice between these systems depends on your plumbing configuration and preferences.
Dedicated Return Line: This system involves installing a separate hot water return line from the farthest fixture back to the water heater. It provides near-instant hot water but can be more complex and costly to install, especially in existing homes.
Demand-Controlled: A demand-controlled recirculation system uses a pump and a temperature sensor or timer to circulate hot water only when it's needed. This type of system is often more energy-efficient and is a popular choice for retrofit installations.
Locate the Recirculation Pump:
Determine the ideal location for the recirculation pump. It should be installed on the hot water line near the water heater, typically before any branching hot water lines. Ensure there is sufficient space for the pump, and it's accessible for maintenance and servicing.
Install the Pump:
Follow the manufacturer's instructions for installing the recirculation pump. Securely mount it to the wall or another suitable surface. Connect the pump to the hot water line and the return line (if using a dedicated return line system). Make sure all connections are watertight and secure.
Install a Check Valve:
To prevent hot water from flowing back into the cold water line and ensure the pump works effectively, install a check valve on the hot water line near the pump. This valve allows water to flow in one direction only.
Connect the Pump to Power:
Most recirculation pumps require electrical power. Ensure there is an electrical outlet nearby or consult an electrician to provide a dedicated electrical circuit for the pump if needed. Follow the manufacturer's instructions for wiring the pump safely.
Set Up Controls:
If you are using a demand-controlled recirculation system, configure the pump's controls. This may involve setting timers or adjusting temperature sensors to activate the pump only when hot water is required. Consult the pump's manual for guidance on programming.
Bleed Air from the System:
After installation, it's important to bleed any air from the recirculation system to ensure proper water circulation. Open the hot water tap at the farthest fixture from the water heater and let it run until hot water flows consistently. This may take a few minutes during the initial setup.
Regular Maintenance:
To ensure the efficient operation of the recirculation system and to prolong the life of the pump, perform regular maintenance. This includes checking for leaks, ensuring proper electrical connections, and cleaning or replacing filters if applicable.

Connecting a recirculation pump to a Takagi TK-340X3-NEH water heater can provide the convenience of instant hot water while minimizing water waste. However, it's crucial to choose the right type of system, follow installation instructions carefully, and perform regular maintenance to ensure the system's reliable and efficient operation. If you are not experienced with plumbing or electrical work, consider hiring a licensed professional to install the recirculation system safely and effectively.