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 than 30 minutes 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 exellerate 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)
Based on 37 reviews
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1-15 of 37 reviews
  1. This device works great. It is a perfect solution for me.

  2. 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.

  3. 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!

  4. very easy to install

  5. I got tired of my remote hot water inconsistency so I started my search. I found Lerian Dynamics and emailed with questions. they responded promptly and answered all my questions I ordered, and within a couple of days to receive the product. I installed at myself which requires plumbing skills that I have. The directions were excellent, and everything works perfectly. I am very satisfied with the product and it works extremely well.

  6. Here’s my situation – new heat pump water heater, fairly large house with hot water recirculation plumbing. You really shouldn’t use a heat pump water heater with recirculation – the heat pump will just end up running constantly. So, I purchased this controller. It was very easy to install – I was already redoing the plumbing for the new water heater, so adding the flow sensor was easy. Wiring was easy, connecting the unit to my phone app was easy, and set was easy. And it’s working exactly as it should! I still get quick hot water throughout the house when needed, and the water heater isn’t running when hot water isn’t needed. I’m very happy with this Leridian Dynamics controller!

  7. I have a Rheem hybrid water heater. The nuance of such a water heater is that they do not recommend a circulation pump when using the Energy Saver mode. The programming and electronics don’t like recirculation pumps. However, the Smart Recirc Control 32 helps dramatically by only recirculating water when needed. It also does not run all the time and therefore the inlet to the hybrid water heater stays at a reasonable temperature to not confuse the electronics and programming. I have found that I’m saving energy costs by implementing this smart control with my hybrid water heater. In some ways I have cheated the programming and I still have recirculation of water and hence on-demand hot water. I would recommend on long recirculation runs that the temperature probe prior to the pump is placed as far upstream as possible. This ensures that hot water does not come close to the inlet of the hybrid hot water heater. Great product!!

  8. I just recently installed this unit in my shop/apartment, replacing another brand which had failed. I am very pleased with the operation and performance thus far. It is obviously well thought out and implemented. I do have the thermocouples attached directly to PEX (with some wraps of conductive foil underneath), and as predicted in the instructions the response lags due to insulating characteristics of PEX. I plan on purchasing a 2nd unit for a new house I am building, and there I will be sure to have copper stubs to attach the thermocouples to. The programability of various parameters using the app works very well. Excellent product.

  9. The system was straightforward to set up, and so far (one month since installation), it is working as promised. We’re looking forward to how this may reduce our gas bill compared to our old system that used a timer, where the circulation pump ran continuous for many hours during the day.

  10. Added benefit: Guests who may not be aware of the system can turn the hot water on and the recirc pump will shorten the time for the hot water to reach the faucet since it is pulling cold water into the return line, thus still saving some cold water from waste. An unaware guest with a push button system would waste all of the cold water. Down side: With single handle faucets it is common to have some hot water flow even when getting a glass of water because many people leave their handles centered. That eats up some electrons with the pump running and does cause some water to be heated that will sit in the pipes slowly losing heat.

  11. Absolutely amazing product. With so many expensive hot water recirc pump solutions out there (ones that also might not meet the needs of the build, GPM wise) this solution allows you to simply use ‘the right pump for the job’ and the brains/logic of this device takes care of the rest. Not only can you buy this along with a better pump and still be cheaper than most ‘high end hot water recirc solutions’, but if/when the pump goes, it’s a simple ‘off the shelf’ pump swap instead of awaiting for a special order pump to arrive. The bluetooth works flawlessly for onsite maintenance and programming, remote Wifi would be a nice added feature for remote tweaking/programming, but understandably would increase the costs of the unit. Very impressed with the system so far.

    Home Page Review
  12. This product is simply genius. It revolutionizes the hot water on demand market. Circulating pumps have been sold for years bragging instant hot water and little water waist while waiting for hot water. When we bought this house that had one installed, I was very happy to save water and have instant hot water. That was until I did some research that revealed I am using massive energy by running the pump 24-7 and energy to keep that water hot in the line. All that waist for the convivence having instant hot water a few times a day. Sure, it did save some water but a very high cost to me and the environment. So, I added a timer to my pump to turn it on morning and evenings when I was more likely to use hot water. Better, but still not that efficient. I have searched for remote on demand systems that I could add to be more efficient, but they all had issues like hard to install, hard to remember if it was left on or off, WIFI or Bluetooth issues, need to use apps or find a good location(s) for control(s). Then I ran across this product. Are you kidding me! No fumbling with buttons or apps – just turn the hot water on for a second to get the pump pumping. Brilliant!! Only pumps when you ask for it and need it. This checks all of the environmental boxes. Absolutely saves water. Use the absolute minimum energy to deliver the hot water – ONLY when needed. The Smart control 32 should be required with every recirculating pump sold.

    Home Page Review
  13. I am a aerospace instrumentation engineer. My worst nightmare is equipment, software, solutions that don’t work. This is not one of those. The Smart Recirculation Control assembled, started, and ran, as plug and play as is possible. The perfect solution for me. I want to help with marketing if I can. A great product…

  14. Easy install and works great.
    Bluetooth app is simple to use

  15. This is just what I was looking for so I could get hot water instantly on the other end of my house without the pump running constantly. I ran a return line and used my own pump and it works flawlessly! Its easy to program and gives you all the control you could want. I have already told neighbors and customers about it. Before I bought it I had several questions so I called in and they were able to answer any and all questions I had without hesitation.