This. I have 20 of them in my home too. Just like @JasonJoel I have them under all sinks, toilets, washer, fridge, and HVAC. My parents attic HVAC caused $15k damage many years ago and I bought these shortly after since a $200-300 investment was much cheaper. The batteries have lasted a few years at this point as I purchased them about the time I bought my first HE hub in Jan 2018.
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I'd like to add them under the toilets but my dogs would definately chew them up! I was inspired by this thread to install the 10th one under the refrigerator. 
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Good call as I also have friends that had water line burst within the fridge and flood their downstairs ruining their hardwood floors. We have crazy high water pressure around here and PRVs (pressure reduced valve) are a must.
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I have these (The homeseer Flex) as well and they work well. I have had them about 6 months and they are still over 50% battery. You can put them on AC with a USB mini adapter then they become Z-Wave repeaters, but you need to determine this before you include them.
Damn it, now you’ve got me thinking that I’ll have to get a plumber to install a ball valve on the water line into my house.
The existing water utility control point is a screw type tap. 
Then I’d have to get 12v. DC outside, for the Zwave Control.
Would be a whole lot easier if this house had an internal mains shut off.
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So you must be in the South. Here in New England the outside water pipe is at least 6 feet below ground level 
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Yep South Pacific, South Asia, South of just about everywhere LOL. - Australia
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Almost 5 years since the last post, and the lots of Iris detectors no longer appear to be an option on eBay. Any current recommendations on water sensors that are available, don't break the bank too bad, and have good battery life? Temp reading isn't a requirement, but I do use Device Activity monitor to watch my devices that don't report their battery right, so it's a plus.
I have most of my Aqara devices coming through and M2 hub. However I have two of the water sensors directly connected to Hubitat. I have had zero issues with zigbee mesh related to them.
I agree consider the Aqara as I also use the wire lead approach to get more coverage area.
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The Zooz ZSE42 (800LR) are nice, and have good battery life. SmartestHouse often has sales were these get cheaper.
I have 10 Linkind zigbee sensors that have been great with 2 years and counting on the original batteries. They were weird to pair but have been rock solid once attached.
More recently added 5 meian zigbee sensors from AliExpress. Paired smoothly and have been solid for the last 6 months. $6.50 each delivered.
Both report battery levels every 4 hours so I can monitor that as well as watch them with Device Activity Check.
Edit: drivers are Generic Zigbee Moisture sensor for the Linkind and Tuya Neo Coolcam Zigbee Water Leak Sensor for the Meian.
Are these what you have? $1 is way lower than $6.50.
https://www.aliexpress.us/item/3256804476180248.html
Is the meian (Tuya) hub really required? I'm thinking no, but want to confirm.
Those are the ones. I did not use a Tuya hub.
The driver was here…
https://community.hubitat.com/t/release-tuya-neo-coolcam-zigbee-water-leak-sensor/91370
Looking back, I had to do the double luck method to get them paired. They have been perfect since pairing.
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$14 for 14 sensors is cheap. Off to order them.
DOH! You are limited to a Qty of 1 with Welcome items. Still $6.50 each is cheaper than Zooz or Third Reality.
