AqaraWater Leak Sensor 3 Pack, Zigbee Wireless Water Leak Detector for Alarm System and Smart Home Automation, Requires AQARA HUB, App Notifications, for Kitchen, Bathroom, Basement, Works with IFTTT

I have a wide variety of Aqara products that include 15-20 Aqara water leak sensors. The other night at 1:30AM, my wife and I were awakened by the Aqara Basic Guard alarm. That alarm indicated that I had a water leak in the closet in the garage that housed our tankless hot water heater.Upon inspection it was discovered that the “overflow tank” for the tankless hot water heater, that also collects condensation from the air conditioner and then drains to the outside, was full and overflowing and had been overflowing for a few days. Luckily, the air conditioner condensation is minimal, but it amounted to several gallons over the few days that the drain line had been plugged and the entire floor of the closet and crawl space underneath were water-soaked. Unfortunately, the leak sensor had been sitting in a singular location that took days to soak enough to set off the sensor!Fortunately, I caught this situation when I did and I was able to remedy the damage and save the closet and the underlying structure. If it hadn’t been for my Aqara Water Leak Sensor, the damage to the crawl space and wall that joins to the house would have been irreparably damaged.

Classic Aqara reliability. We have these under our kitchen sink and lower 1/2 bath. They add right to home assistant without needing the Aqara hub.

The Aqara Water Leak Sensor works with Hubitat hubs. The sensor has two sensing contacts on the bottom that are Allen head screws. These can be backed out to touch the surface it rests on. The screws can also be backed out and small gauge wire (24 GA or smaller) can be placed under the screw head and tightened back up. The wire ends can be placed in any location away from the sensor. These work for me, the Hubitat compatibility and remote sensing is exactly what I was looking for.

Simple enough to set up, time will tell if it lives up to expectations

I am using 3 of these with an Aqara M3 Hub. The M3 (which I would highly recommend) has a built in speaker for alarms.Adding the leak sensor to the Hub was easy and took only seconds. The Aqara phone app offered to automatically create an alarm for them.I tested them by wetting my hand and pressing them into my hand, they each immediately notified of a leak via the M3 Hub's audio alarm. They have two exposed metal screws on the back whihc sense water using an electrical signal between the screws. I beieve they would signal a leak if you had aproximately 1 mm of water, so not much. They do need to be placed flat on the surface you want to monitor. I put them in some corners of my basement where water has got in previously.I used these under Home Assitant as well (they work great with Zigbee2MQTT), but decided I liked the Aqara ecosystem features better. Either method of control works well, depending on your preference.Note that you compress the dome of the sensor to push the pairing "button". And a blue LED will blink through the dome. It's not totally obvious to do this.

Update - 11-29-2023:Added temperature sensor info below and attached image.Original Review:Bought these since they were on sale and wanted something to integrate to Home Assistant. Wasn't super on board with the idea of a "coin" style water detector (would prefer the cable type), but went with this to give it a shot. I put it next to the drain and water heater downstairs.Fast forward three months. We had a small backup in our drain downstairs and the alarm in Home Assistant went off. Saved me a lot of damage I'm sure. You will 100% want to make sure you set up multiple critical notifications in your automation and consider choosing a custom obnoxious sound. If you're sleeping, you want to make sure you don't sleep through it.The Good:-- Paid for itself already-- Integrated very nicely with my Sonoff receiver in Home Assistant.-- Fairly non-descript and small. Hard to notice on the floor.-- Fast. This thing went off immediately when water had reached it.-- Inexpensive! I'll be honest, I really wish there was a cable type Zigbee detector that wasn't $100. But this thing is just so darn inexpensive that you can get six of these for the cost of one of those plus an extension cable.The Cromulent:-- It's battery-powered. As mentioned above, I the cable type is preferred, but I'm guessing there's zero chance of a cable type without having to be plugged into an outlet. Plus you can put these wherever you need without having to worry about an outlet.-- TBD on battery life so far. I've been tracking this since I installed it in mid-July. Started at 88% with the factory-supplied battery (constant problem with Aqara) and within ten days it had dropped to 70%. It has been sitting there at 70% for three months now. I'll update this when I have to change batteries.-- The LQI shows a fairly weak connection, which is surprising given that it's only 10-15 feet away through two interior walls. Kind of surprising given that other devices that are much further away are significantly better.The Bad:-- The temperature sensors in these are utter garbage. They're the internal temperature of the device, not the room they're in. They're off by 10+ degF and should NOT be relied upon in any capacity.Overall:There really are no major primary weaknesses to this device. I'll be grabbing a couple more when they go on sale to scatter around the house. I'd like to get the Eve Water Guard but at $100 + $20/6 ft, it's really hard to justify it.The temperature sensors are useless cost adders and Aqara would be better off just removing them.