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Faster Hot Water

DRS-T Installation Instructions

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You have 3 options on where to install the circulation pump (see Figure 1 below).  These instructions will focus on installing the recirc pump in the return line.

Step 1. Choose the location of the pump

Position C (see Figure 1 to the right) in the return line is the most common position, followed by position A.

The circulation pump can be installed in the hot water line out (A), the cold water feed in (B) from the water heater or in the return line (C). Ease of installation is the only consideration when making your decision.

These instructions will focus on installation in the return line (C).

Figure 1

Step 2. Turn off water heater

Turn off water heater to make sure it does not come on during installation.


Failure to follow procedures described in this document could have impact upon warranty and may cause inadvertent property damage.

Step 3. Turn off water

Turn off water to the tankless water heater.

In most cases there is a valve located near the water heater on the cold water supply line.  
Step 4. Drain the hot water lines

Turn on any hot water faucet in the house and let it run until the water stops flowing. Leave the faucet on for the duration of the installation. Drain remaining hot water using the hot water spigot on the water heater.

Note: If water continues to flow, check to make sure that the water has been completely turned off. If the valve does not shut off the water flow completely turn off the valve supplying water to the house or at the water meter.
Step 5:  Install pump in return line

Make sure the arrows on the pump and Flow Monitor are pointing in the direction of flow.

Use 2 - 3/4" female adapters or 2 - 3/4" SharkBite female adapters to return water line.  Note:  Pump can be installed in 1/2" return line but will need appropriate 3/4" to  1/2" reducers.
Step 6:  Set pump speed
Set pump speed to 3 for the fastest operation. Pump speed switch trans MT.png
Step 7: Set pump mode
Set the rocker switch in the pump's electrical cord to the "Move" position (the continuous position in the picture to the right). Rocker switch DRS MT.png
Step 8. Install the Flow Monitor

Make sure arrow on Flow Monitor is pointing in the direction of water flow.  If not, refer to directions above.

Install Flow Monitor in the cold water that feeds the water heater.  The Flow Monitor must be installed outside the dedicated return loop.  

Warning: do not over tighten.

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Note: The large yellow arrow on the Flow Monitor must be pointing in the direction of flow. The direction of water flow through the Flow Monitor can be changed by removing the 4 screws and turning the black cap and internal parts of Flow Monitor 180°. Reinsert screws and tighten.

The Flow Monitor must be installed outside the hot water return loop.  See Figure 1 above for the appropriate location for your application.

Step 9. Complete connections and turn on water
Make sure that a hot water faucet is turned on in the house and then slowly turn the water back on to the water heater. Check for leaks and repair as necessary. Leave the water running until all of the air has been purged from the water pipes. Turn off the faucet.
Step 10:  Connect the Flow Monitor to the Pump Manager

Connect the low voltage wires from the Flow Monitor to the Pump Manager using the proper wire connectors.

If extra length is required standard thermostat wire can be used.

The color of the wires are as follows:

Flow Monitor - Blue and Brown

Pump Manager - Red and black or red and white

The blue wire connects to the red wire and the brown wire connects to either the black or the white wire.

Step 11Test Dedicated Recirc System

Turn on any hot water faucet in the house for 1 second and turn it off. Pump should continue to operate for approximately 1 to 2 minutes after the faucet has been turned off.

Note: The off-delay timer will not start until all demand for hot water has ended.

Electrical Information

Safety Warning - Risk of Electrical Shock

This pump is supplied with a grounding conductor. To reduce the risk of electrical shock, be certain that it is connected only to a properly grounded grounding type receptacle.

The safe operation of this pump requires that it be grounded in accordance with the national Electrical Code and local government regulations.


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