What is Smart Recirculation Control?

Smart Hot Water Recirculating Pump Controller

This controller turns any home or business plumbing system with a dedicated circulating line, tank water heater, and hot water circulating pump into an on-demand hot water system. 

Smart Recirculation Control from Leridian Dynamics

On demand hot water recirculation control system diagram animated image

Turns any recirculation pump into an on-demand recirculation pump. 

  • Flow-based hot water pump controller.
  • Unique dual temperature sensor design.
  • Reduces pump run time to less a couple hours a day. **
  • Includes built-in pump timer capability.
  • Easily configure with your Android or iPhone smart device. 

The Smart Recirculation Control is an On-Demand smart hot water recirculating pump controller for homes with a dedicated recirculation loop (if you don’t have a dedicated recirculation loop check out our Smart Thermostatic Control).  This control works with tank and tankless water heaters. If you have a Navien combi unit check out our Smart Aquastat Control.

The Smart Recirculation Control controller 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 is hot. 

The microprocessor-based design monitors the temperature of the water in the loop using a unique dual temperature sensor design to ensure the water in the loop stays hot while hot water is being used.

On-Demand Operation

To operate go to any faucet and turn the hot water on then off.  The Smart Recirculation 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 Recirculation 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, maintain wireless transceivers, or replace batteries.

Smart Timers and Vacation Mode

The Smart Recirculation Control also has a set of “Smart Timers” that can be used to heat the recirculation loop on a schedule.  But because of the dual temperature sensor design, the Smart Recirculation Control only runs the pump until the loop is heated up.

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. The on-demand functionality is still in effect outside of the timers.

The Smart Recirculation Control is all you need to efficiently control your hot water pump.  Because of the dual temperature sensor design, it doesn’t matter what temperature is set on your water heater, it uses the difference to know when to turn the pump on and off.  Flow meter sensitivity and temperature difference settings are easily set with your Android or iPhone smart device.

The Smart Recirculation Control Helps Save Your Plumbing. 

Running a recirculation pump continuously will accelerate the erosion of the copper piping in your home causing pin-hole leaks requiring replacement of the entire hot water supply system and water damage to your home. This is no small expense.

The Smart Recirculation Control helps avoid this expense by turning your recirculation pump into an on-demand hot water system.  Running a pump “on demand” typically reduces pump run time to less than 45 minutes a day!

Start saving water ($), energy ($$), and your plumbing ($$$) by installing Smart Recirculation Control!

Smart Recirculation Control works with all 110/220 VAC makes and models of pumps up to 1/2 hp. Our Smart Recirculation Control family of products is made with a Type B plug and socket. Other plug and socket types will require an adapter appropriate for your country.

* of the US and foreign parts, it’s hard to obtain US-made semiconductors
** typical usage for a household of 4 (link to log file example)
a couple
Based on 49 reviews
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1-15 of 49 reviews
  1. Works exactly as described and expected. Had a plumber install it as my prior experience with pressure side plumbing hadn’t been painless. It didn’t seem to work for the first day or so, so I unplugged it and ran the recirculating pump cord directly into the socket for some immediately needed hot water.

    The next day I plugged the controller back into the socket and the pump cord into the controller. From that point on it has worked perfectly.

  2. The smart controller works great. The circulator only runs a total of 20 minutes per hour during each active period now. Plus we can turn it on any time during the day by just turning the hot water on for a few seconds. This should save a lot of water and electricity. Part of lowering my carbon footprint.

  3. Works great, it’s nice to have predictable hot water and not be firing propane unnecessarily at my cabin

  4. Easy to install and operate via the app. Very happy to have the system operating, it’s really reduced wear and tear on our water heater, reflected in lower gas bills.

  5. I am not a plumber but I was able to install the controller without any help. The install instructions are good and the new controller is now working perfectly.

  6. I choose to use the SRC 32 after speaking with David from Lerian Dynamics. I called looking for some basic guidance and could tell that David is the engineer behind this product.
    It is amazingly thought out, simple and solid. Plus getting support is quick and David takes the time to explain how and why things are happening.
    I highly recommend any Lerian Dynamics product for people that need a flexible system which can be tuned for your exact situation. They are highly recommended!

  7. When I discovered the circulation pump on my hot water heater was running 24 hours a day, and it was using so much electricity that I knew I had a problem. With experience in control systems as an engineer I knew what needed to be done, but I had to find the right product to achieve the function that I was looking for. After some searching, I found this product, and it has not disappointed. I wanted something that made my circulation pump run on demand, and this works perfectly. Not only does it work all day long on demand, I can also set it to run on a schedule for when I know I will need the water. The comparison of the supply and return temperatures is an excellent added feature to compare temperatures rather than looking entirely at a return temperature. Simply put: this product works exactly like is is supposed to, and it is an ideal solution to save you some money on your utility bill while still having hot water when you want it.

  8. Great system and even better support.

  9. It was simple to install and works just as advertised. This is a big improvement over the old Radio Shack electronic switch we had and so much more efficient than running the recirculation pump continuously.

  10. I bought the Smart Recirculator Controler 32 to accompany my new Rheem 50g hybrid water heater. Prior to finding this product my Rheem would run continuously while the recirculator pump was running causing excessive energy consumption and negating the purpose of hybrid water heater. I ended up turning off the recirculator pump and began searching for a solution. However, this just caused us to waste many gallons of water waiting for hot water. I discovered the Smart Recirculator Controller 32 was the perfect solution. Now we turn on the hot water for 2 seconds to start the recirculator pump and within 3 minutes we have immediate hot water at every faucet in the house without wasting water. In addition, when hot water returns to the recirculator pump the Smart Recirculator Controller 32 turns it off optimizing energy savings. Ingenious and perfect solution. I calculated that the ROI on the Smart Recirculator Controller 32 is less than 1 year but best of all it returns hot water at the faucets and energy savings from the Rheem without wasting water. The app is helpful and informative too. Very happy customer!!!

  11. Our biggest natural gas expense was for hot water heater, so having the re-circulating pump controller has already saved us a lot of money – by allowing us to program it for only the times needed. Very flexible, easy to use, love it!

  12. This device works great. It is a perfect solution for me.

  13. I love simple things that work-and this system does it superbly. I researched all my options and decided on the recirculation 32. I was given good advice from the company that recommended this product for my recirc system and installed it myself as suggested. It was easy- pezy. It works great as advertised. Simple. Efficient. Well engineered.
    I love the app as well.
    The dual temperature sensors revealed to me how much radiant heat I was losing in my non-insulated copper system which prompted me to insulate the recirc system saving me more $.
    In summary, this is a straightforward system that works great, is technologically advanced (app feature) and will save you $$ and is environmentally friendly.

  14. Very easy to connect and get running. Easily connected to the app to configure, monitor, and manually trigger. My only issue was that the unit is not sealed and one connection develop a leak which dripped on the unit and shorted it out. Just be sure to position it accordingly to avoid this and you’ll be fine. On the plus side, Dave at Leridian was very responsive and helpful and got me back up and running ver quickly. Great customer service like this is not easy to find!