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Product Review: SmartThings Water Leak Sensor


Samsung is kind of on a roll releasing new SmartThings devices. In addition to the SmartThings Button that I recently wrote about there is the newly redesigned SmartThings Water Leak Sensor. As many of you may know I am a believer in having quality sensors and a water shut off valve in place in any home, smart or not. I have been using LeakSmart Sensors and a Leaksmart Valve for some time now and love the valve but have always had a rocky relationship with the sensors. When the Leaksmart Sensors work they work great but they are not always working and being powered by three AAA batteries that you really only get about 4 months on is a pain in the butt. With that said I am always looking for new sensors and that is where the SmartThings Water Leak Sensor comes in.


  • Top and bottom mounted contacts
  • Fast response
  • Reasonable battery requirements


  • No audible alarm
  • Fixed position monitoring
  • A little bit on the thick side

Since I reviewed the Guardian by Elexa Leak and Flood Prevention System, I have been a fan of sensors with contacts on the top and bottom and am very happy to see this feature on the SmartThings Water Leak Sensor. Having contacts on the top allows the SmartThings Water Leak Sensor to potentially catch a leak before it hits the floor. If placed properly say under a faucet or under a p-trap in a drain it is conceivable that water could hit the top of the SmartThings Water Leak Sensor before it hits the floor or bottom of your cabinet and provide you with an earlier warning.

The SmartThings Water Leak Sensor is Zigbee, I have tested other Zigbee and Z-Wave sensors in my home and really Z-Wave VS Zigbee does not matter in my home as I have spent a lot of time building proper Z-Wave, Zigbee, and Wi-Fi mesh networks so I have coverage for everything everywhere. This is not the case for most and while I prefer Zigbee over Z-Wave in my experience customers generally have stranger Z-Wave networks than Zigbee simply because Z-Wave has more products that are more widely known. If you are thinking about adding a leak sensor, be it the SmartThings Water Leak Sensor, and Iris Leak Sensor, a LeakSmart Sensor or any other sensor make sure you have good mesh coverage because the only thing worse than not having protection is thinking you do have protection when you actually don’t.

Now one thing I just do not understand why Samsung did not add as a feature is an audible alarm. To me, this makes very little sense. I may not have my phone on me or may not notice a notification from SmartThings when the SmartThings Water Leak Sensor detects water. In my application where I have a LeakSmart Valve, it will automatically close when any sensor detects water so I am covered but I would still like an audible alarm. My only way around this is to incorporate the SmartThings Water Leak Sensor with my Dome Siren utilizing WebCoRE and that works but would prefer something local on the device.


Audible alarm aside, the SmartThings Water Leak Sensor works very well. I have compared its performance to the LeakSmart Sensor and the Iris Leak Sensor and the SmartThings Water Leak Sensor responded the fastest with the least amount of water. A lot of credit for the performance has to be given to the design of the SmartThings Water Leak Sensor. The contacts on the top are very shallow so water does not need to pool up to much to bridge them. On the bottom, it is the opposite the contacts site just about flush with the floor so again it does not take a lot of water to collect in order to bridge the contacts. When I reviewed the Guardian by Elexa Leak and Flood Prevention System, I commented that the sensor was sensitive enough to detect the moisture in my finger, and while this may seem good at first it can actually be a pain in the ass to have a leak sensor that is so sensitive, especially if you live in a place that has humidity.

I wish the SmartThings Water Leak Sensor had an audible alarm and had an extension cable for the sensor so that it could easily cover a larger area but for the price, I am very impressed with these sensors and will most likely end up replacing all of my LeakSmart Sensors with that as I am getting sick of changing batteries.

Overall Rating


Anyone using the SmartThings Water Leak Sensor? What do you think of it? Let me know in the comments below.


Mike View All

I am passionate about the IoT and connected devices. Using connectivity to automate our lives will empower civilization to achieve greatness.

3 thoughts on “Product Review: SmartThings Water Leak Sensor Leave a comment

  1. You don’t need webCoRE to get an audible alert from a leak sensor–Smart Home Monitor can do this natively. (That being said, I didn’t know until now that there were any smart leak sensors that had onboard alarms.)


      • So, I forgot to mention the advantage (besides ease of use for those who aren’t familiar with webCoRE): if you use SHM, your “alert with sirens” child app will execute locally. WebCoRE (and most other SmartApps, for that matter) require cloud processing, and for things where either speed or reliability are critical, I prefer to keep things local (actually I prefer that in general, which is why none of my devices are paired to ST anymore, but that’s another story :)).


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