Smart Thermostatic Control

Demand-Sensing Hot Water Recirculation Pump Control

Smart Thermostatic Control for Aquamotion AMK-ODR Thermostatic Valve System. For use in homes without a dedicated recirculation loop.

Smart Thermostatic Control AquaMotion Complete on demand hot water system - Leridian Dynamics
Smart Thermostatic Control AquaMotion Complete on demand hot water system - Leridian Dynamics

The Complete Thermostatic Control System includes:

  • Smart Thermostatic Control 32
  • Stainless steel AquaMotion hot water circulating pump
  • High flow AMK-ODR crossover valve kit
  • NPT Hall Sensor Flow Meter
  • Flange kit


The Smart Thermostatic Control 32 and the AquaMotion AMK-ODR valve and AM5 pump are made in the USA.  Only the Smart Thermostatic Control 32 is sold with the AquaMotion high flow thermostatic crossover valve that provides fast, on-demand, hot water to all locations in your house.  

The small, plastic valves from Grundfos, Watts, and Taco just don’t have the water flow necessary to quickly heat up the water when you demand it. If you have a system with plastic valves see information on Smart Countdown Control on-demand hot water recirculation timer.


The Smart Thermostatic Control is a demand-sensing hot water recirculation control system designed for homes without a dedicated hot water recirculation loop.  

It works using the AquaMotion AMK-ODR high flow thermostatic crossover valve which is installed underneath the sink(s) that are furthest from the water heater and the AquaMotion AquaMotion AM5SF1L pump that is installed on the outlet of the hot water heater.  

One AMK-ODR valve needs to be installed at the end of each dead-end hot water line. If you need to know how many valves you need check this guide.

Rather than running the pump all the time or on a timer as other systems do, the Smart Recirculation Control waits until it senses hot water being used anywhere in the house and then turns the pump on.  

When the pump runs it pushes water through the  AquaMotion AMK-ODR thermostatic crossover valve from the hot water line to the cold water line.  Once the hot water reaches the thermostatic crossover valve it closes and stops the flow of water.  

The Smart Recirculation Control senses that water has stopped flowing and turns the pump off.  

The controller then goes dormant for a user-configurable period of time so it isn’t switching the pump on immediately after heating the system up (default 10 minutes). 

The Smart Thermostatic Control demand-sensing hot water recirculation control system is configured via a smartphone app with Live Flow™, which shows the flow meter value in real-time. 

The Bluetooth app allows you to easily configure the “on” and “off” flow values independently but tests have shown that the default values work well in most installations. 

The Smart Thermostatic Control is also configurable to run via “Smart Timers”TM in order to heat the system up on a schedule.  The controller will turn the pump on, allow it to get up to speed, and run it until the flow drops below the “off” value.  It will then go to sleep for the dormant period before testing the system for flow again. 

Of course, the controller will still run the pump on demand, whenever you need hot water, outside of the timer periods.

The “Smart Timers™” are disabled if the controller doesn’t sense any hot water draw within 24 hours.  So if you go on vacation and forget to manually disable the timers, no worries, they will turn themselves off and re-enable as soon as it senses a hot water draw. 

The Smart Timers are set via our Android app for Smart Thermostatic Control 32 or iPhone or iPad app for Smart Thermostatic Control 32 using your smart device. Our app does not collect data on our customers.

Turning any domestic hot water system into an on-demand system couldn’t be simpler!

Play Video about Smart Thermostatic Control 32 Installation Demonstration Video

This is the smartest way to install an on-demand hot water system in a house that doesn’t have a dedicated hot water recirculation loop.  The Smart Thermostatic Control works with both tank and tankless water heaters. 

The tank water heater version has a thermostat that gets attached to the hot water outlet pipe from the water heater to ensure that the temperature of the hot water is greater than 95F to prevent lukewarm water from being pumped throughout the house. 

Tankless water heaters don’t need this extra check since they never run out of hot water.

Our demand-sensing hot water recirculation control system works well for homes that have multiple dead-end runs.  You would install a thermostatic crossover valve at the end of each dead-end run and a single pump at the water heater and all runs will heat up. 

Smart Thermostatic 32 Solutions
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  1. Michael P. (verified owner)

    We’ve been using the pump for about 6 months now and love it. Instant hot water throughout the house is amazing. We really like the combination of both scheduled and on-demand pump activation. The ability to control the device through Bluetooth connection is great. David has provided great customer service in troubleshooting our setup. My only complaints, if you will, are the lack of WiFi support and we’ve experienced notable water hammer after installation.

    Smart Thermostatic Control 32 Complete AquaMotion SystemSmart Thermostatic Control 32 Complete AquaMotion System