Last year I installed a Ready Hot instant hot/cold water dispenser in conjunction with a Filtrete Maximum under-sink water filter. The online reviews for both items indicated that leaks could be a problem, so to avoid potential damage and have more peace of mind, I installed the Flood Stop in conjunction with both of them. I also installed a Xtreme Mats Under Sink Kitchen Cabinet Mat under the sink to better contain any leaks and ensure they are detected quickly by the Flood Stop.

The FloodStop instructions were not great (they were focused on the washing machine model of this device) but the company provided fast answers to my questions via email after I called them. One area for improvement is that there is a lack of strain relief where wires attach to valves and to the control unit. I tacked up the low-voltage wires to the side of my cabinet with insulated staples to ensure they won't get pulled on in normal use.

The output of my below-sink water filter goes into a ¼" John Guest tee fitting that feeds my Ready Hot along with a copper line that runs through the crawlspace and extends to my fridge across the room. Since I've had some water supply leaks from the fridge in the past, I opted to buy an extra leak sensor and use 18/2 thermostat wire to extend the water detection to the area under the fridge in case there's ever a leak there.

It would have been easier to install a completely separate FloodStop system for the fridge (I would have avoided the need to run the 18/2 cable through the crawlspace and inside the walls). However, since the fridge water line is now fed by the filtered water under my sink, it was way cheaper to just add a sensor and not purchase a totally separate unit for the fridge.

I love the peace of mind I get knowing that a leak from any of the plumbing under the sink will result in an alarm and automatic shutoff rather than a flood and property damage!

Money worthy

Here's a photo of how this looks installed under my kitchen sink. I bought this FloodStop device after my mini water tank heater sprung a leak and made a big mess. The way this works is pretty simple - it shuts off both water supply valves as soon as there is a short circuit in the sensor grid (so it's easy to test by touching a piece of metal). I can see the company has put some thought into the reliability details, for example the logic automatically cycles the valve on and off every month to make sure that the valve doesn't get stuck. When a leak is detected, the alarm beeps and then you can press the button to mute the sound, or press a button to open the valve after the water is dried from the sensor. I'm using Energizer Ultimate Lithium AA batteries for the backup because these will last much longer than alkaline batteries. It took me about 15 minutes to install this, and most of the time spent was to make the excess wire look nice using plastic zip ties.

This product would deserve five stars for the way it works and the damage it could prevent. So I recommend it - but deduct one star for some annoyances

The wires from the control panel to the valves are a stingy 30 inches - far too short to reach from the water supply, around under-sink clutter, to someplace accessible to mount the control panel. I would suggest adding to your order the 9 foot extension cables (too long for this use) - except Amazon doesn't sell them.

The one outlet under my sink has to handle two other AC cords, but the strangely shaped plug blocks two of the outlets on my 3-way adapter.

I almost returned the product because the instructions say it is for a "Washing Machine," not a sink. In fact the instructions apply to three different models although the only indication of this is three model numbers next to "Washing Machine" and the illustrations which don't look like what's in the box.

All that said, the installation was fairly easy and it works as advertised. So I hope the manufacturer lengthens the valve wires and fixes the instructions, but I still recommend the product.

I used this unit as a shut-off for a Costco purchased Reverse Osmosis unit. With a few adapters purchased at the local hardware store, I use the dual-valve version to shut off the main water supply, and the output of the Reverse Osmosis tank.

Once, when I did a new install, I didn't connect the host to the faucet just right, and it came lose, and started pouring water under the sink. Within a few moments, the sensor detected the leak, and shut down the valves. Was glad to have it.

I purchased this, when I woke up one morning to find my kitchen and family room flooded after a water filter O ring failed over night, and started leaking. If I had had this, I would have saved much time and damage.

I recommend something like this for any under the sink water filter solution. I'm thinking I would like to have one in the laundry room as well.