Smart Aquastat Control 32


Product Info

Leridian Dynamics, Inc. fourth generation flow meter based, “on demand” Smart Aquastat Control 32 for homes with dedicated recirculation loops and tankless style water heaters or anyone who wishes to control the hot water loop temperature based on an absolute temperature rather than the temperature differential. This controller can be configured and upgraded with your smart phone and supports “Live Data,” “Smart Timers,” and logging.

Satisfies CA Title 24 requirements

Download Android App  Android app from Leridian Dynamics for Smart Recirculation Control

Download iPhone App  iPhone app from Leridian Dynamics for Smart Recirculation Control

View the Installation Guide

(14 customer reviews)
The Smart Recircirculation Control comes with a 90-day, no questions asked, money-back guarantee.  If after installing the Smart Recirculation Control you are dissatisfied FOR ANY REASON WHATSOEVER with the performance of the Smart Recirculation Control, simply package up the unit and return it to us with a note explaining what about the product you are dissatisfied with and we will refund your purchase price minus original shipping charges and credit card processing fees*.  This guarantee applies to our controllers, Maxx-Flow thermostatic valves and Leridian Dynamics 2006SN10 pumps.

*Due to changes in the credit card processing industry whereby the credit card company DOES NOT refund credit card processing fees to our company, all canceled or returned orders will be subject to a deduction of this fee (2.9% of the transaction + $0.30) when refunded. The companies Square, Stripe and PayPal have all started doing this. In our case it will be Square that is keeping your fee for your canceled order not us. 

  • Free shipping to US and Canada on orders over $150.00.
  • Usually ships within 2 business days.

Customer Reviews

14 reviews for Smart Aquastat Control 32

  1. Bob Goettle (verified owner)

    Thing works great, very satisfied with both it and Dave’s great customer service.

  2. Jon J. (verified owner)

    Just as advertised! This set up is ideal for those with on-demand and tankless water heaters. I have it on a long recirc loop to my kitchen and it works perfect.

    Was not at all difficult to install and the controller fires right up and works. Having the combination of flow and temp is the right set up for on-demand units.

    The plumber I have said it couldn’t be done. This unit proved him wrong! Works great.

  3. Robert Yates (verified owner)

    This is the solution for my hot water recirculation system. Just what I was looking for.

  4. Anonymous (verified owner)

    System works great and the support is fantastic. Highly recommend.

  5. Bill (verified owner)

    This setup is great. My water heater is quite a distance from the kitchen sink. We used to have to run the water a while to get the water hot. I was considering an undersink water heater when I found this. Makes more sense and doesn’t waste water.

  6. James S. (verified owner)

    I will start out by saying this is a great system and it is working very well and as designed. We had a different idea for the water system in our house. Our kitchen/washer/dishwasher was on the opposite side of the house (50 feet) from the Hot Water heater. We wanted to install a recirc system to speed up the time it took to get hot water to that end of the house and to save water, but we did not have an installed recirc loop. We also did not want a system that required Alexa, a pushbutton, or a phone app to start the recirc. Looking on the Internet, we found this smart recirculation system. Working with Dave, we agreed this system would meet our needs. One difference is we installed the flowmeter in the kitchen hot water line and not on the cold water line to the hot water heater. I installed a new recirculation loop and connected it to the cold water return line to the hot water heater. The flowmeter is rated for hot water temperatures (120F) and has worked great with no problems since it was installed. After installation, I observed the hot water loop increased in temperature without the pump running. This is where Dave excelled. Even during the holidays, Dave responded to numerous emails to help us troubleshoot the system. We finally determined it had to be thermal convection from the hot water heater was causing the flow. I ordered a spring loaded check valve with a 0.4 psig cracking pressure and installed in the recirc return line. This solved the continuous flow problem and the system has been working flawlessly since. I can’t complement Dave enough for his response to our problem and his support. I would also add that the pump is super quiet and cannot be heard when the system operates.

  7. Edward P. (verified owner)

    Works as advertised, love the controls in the app!

  8. William Gifford (verified owner)

  9. James Hoeft (verified owner)

    For my particular case, it has far more features than necessary. Ideally, for me, I would prefer a simple turn the hot water on then off, then the pump would run for two and a half minutes. That’s it, all I need. No need for a temperature sensor, just want to keep the 6 – 8 gallons of water it takes before hot water gets to the back shower from going down the drain. To make sure the pump turns off, I put the sensor on the hot water pipe (not the return – to do that correctly, I would have to run 50 feet of phone wire, which I tried with some wire I had, but it did not work).

    • David Lehrian (store manager)

      Hello James,
      We have a product called the Smart Countdown Control 32 that does not use temperature sensors. It simply triggers the pump when it senses flow, runs for a period of time and then turns off. You can install this firmware by opening the smart phone app and navigating in the menu to Firmwares then click the button that says “Show All Product Firmwares” and selecting “Smart Countdown Control” from the list.

      While the line that is used to extend the temperature sensor is nothing special, it needs to be wired straight through. We sell temperature extensions on our web site that are designed this way and are tested to work with our system.
      Warmest Regards,

  10. Anonymous (verified owner)

    The system works great! My recirculation connection is actually not near the tankless gas water heater. However, adjusting the sensitivity for the flow meter, the pump turns on when the faucet activates it!

  11. Tomasz M. (verified owner)

    Works great, exactly as advertised

  12. Mark S. (verified owner)

    Just installed device. Seems to be working as expected.Solved a problem. Glad I found this product.

  13. Chris M. (verified owner)

    This is the best controller on the market, and it took me months to find it. We had previously had a recirculating pump and controller and loved it. An unrelated accident killed the controller, Original manufacturer was out of business. So trying to replace it I had some very specific things I wanted it to do.I actually came across “Smart Recirculation Control” and had e-mailed the company to see if they could customize one of there controllers. To my surprise I received an email back the next day they had a controller that already did what I wanted and more. I had just missed it as they make several controllers for different solutions. This controller gives you truly on demand control as wells the ability to schedule many timer controls. We love it!

    Home Page Review
  14. John G. (verified owner)

    simply outstanding

Only logged in customers who have purchased this product may leave a review.


Demand-Sensing Hot Water Recirculation Control

Smart Aquastat Control for Homes with a Dedicated Recirculation Loop

✓  Configurable via Bluetooth Enabled Smart Phone App

✓  Satisfies CA Title 24 requirements

✓  See real-time flow and temperature values via Live Data™

✓  Proudly designed and made in the U.S.A.*

The Smart Aquastat Control 32 is an on-demand smart hot water recirculating pump controller for homes with tankless water heaters and a dedicated circulation loop (if you don’t have a dedicated recirculation loop check out our Smart Thermostatic Control).  It is designed to sense when hot water is drawn from any plumbing fixture and to run the recirculation pump until the water in the recirculation loop reaches the programmed temperature. The microprocessor-based design monitors the temperature of the water returning in the recirculation loop to ensure the water in the loop stays hot while hot water is being used.

The Smart Aquastat Control 32 will work with all types of water heaters but was specifically designed to work with tankless water heaters. While tankless water heaters are good at producing a never-ending supply of hot water, they are only capable of increasing the temperature of the water at a certain rate.

Even the large 200k BTU units, for example, are only rated as being able to increase the water temperature by 40F° at 6 GPM or 80F° at 3GPM. So if you are starting with 60°F water, you can get 100°F water at 6GPM or 140°F water at 3 GPM (this is just an example, home water heaters should never be set higher than 120°F to avoid scalding issues).

But if your hot water line has sat and is cold and you want to get hot water out to your fixtures quickly your recirculation loop may employ a 12 GPM pump which only allows the heater to produce a 20F° rise in temperature. So the first time through the temperature will increase from 60°F to 80°F and on the second pass from 80°F to 100°F.

The ultimate solution to this problem is to install a small 5-gallon tank water heater after the tankless water heater. Not only does this provide an immediate supply of 120°F water to recirculate, but it also acts as a buffer tank for the tankless water heater to eliminate the dreaded “cold water sandwich”. Barring that, the best solution is to use the Smart Aquastat Control as it runs the pump until the temperature of the water at the end of the recirculation loop reaches the controller temperature set point.

To operate go to any faucet and turn the hot water on then off.  The Smart Aquastat Control senses this minimal draw checks the water temperature in the loop, and if necessary, starts the pump running.  Within seconds the water loop is hot and you are able to draw hot water.

Because the Smart Aquastat Control uses the demand of hot water to know when to run the pump, it works even when your washing machine or dishwasher needs hot water.  Unlike other on-demand hot water systems, there is no need to install switches or sensors at each faucet location and run wires or maintain wireless transceivers.

The Controller also has a set of “Smart Timers” that can be used to heat the circulation loop on a schedule.  The Smart Aquastat Control only runs the pump until the water line is heated up to the programmed temperature.

Of course, outside of the timer periods, the controller will still run the pump on demand. The Smart Timers are disabled if the controller doesn’t sense a hot water draw within 24 hours.  So if you go on vacation and forget to manually disable them, 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 your Android or iPhone smart device.

Download Android App  Android app from Leridian Dynamics for Smart Recirculation Control

Download iPhone App  iPhone app from Leridian Dynamics for Smart Recirculation Control

Additional information

Flowmeter Size



2006SN10, No Pump