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How many sensors does your home need?
Tick the places water could leak. The planner counts sensors and points you to a kit.
A leak sensor only works where the water lands, so the count matters more than the brand. Most homes need three to six. The water heater, washer and kitchen sink are the usual first three, because they hold or move the most water.
Six checks from each maker’s documents and its brand listing on Amazon, equal weight.
PlumbingPicks spec score out of 10, from YoLink, GoveeLife and Moen documents read Oct 23, 2026. It is not a customer rating or our own test.
Every pick sends phone alerts with nothing else to buy, so that check doesn’t separate them. What does: whether the maker publishes an alarm volume, battery life, freeze or temperature alerts, how far the sensor reaches, and a waterproof rating.
Moen scored lowest because its spec sheet leaves three of those blank or lower: no alarm volume, a 2-year battery, and no waterproof rating. It wins on reach with its 48 in. remote sensing disc.
Each pick, in detail
What each maker publishes, which homes each suits, and where each lost points.
Best for whole-home coverage and freeze alerts
YoLink Leak Sensor 4 kit
YoLink Water Leak Sensor 4 105 dB alarm kit: 4-pack + hub, YS7906
Sensors can trigger YoLink sirens or valves without internet
Cons
Needs its hub online for phone alerts
No cable or remote disc for reach
Listing says IP67; YoLink’s page says IP66
105 dBIP662 AAA eachLoRa, 2,034 ftHub included
Buy it if
You want to cover a whole house, a basement or a detached garage, and you might add a YoLink shutoff later.
Skip it if
You want sensors that join your Wi-Fi directly with no hub.
The YoLink kit covers the most ground and does the most on its own, and I’ve used it. It scored 9.7.
YoLink describes the Water Leak Sensor 4 as a puck sensor with a built-in 105 dB piezo sounder and low-temperature sensing that warns you of conditions that can freeze pipes. That’s a 10 on alarm and a 10 on freeze alerts.
Battery life is its strongest number. YoLink says its LoRa long-range, low-power radio gives 5+ years between battery changes, and the listing says each sensor uses 2 AAA batteries. A 10.
The kit includes a YoLink hub, which connects to your router by Ethernet or 2.4 GHz Wi-Fi, so phone alerts work out of the box. YoLink says remote alerts need the hub and internet to stay online, and the listing adds app, email and SMS alerts.
The feature I value most is what YoLink calls Control-D2D: sensors paired directly to a YoLink siren or shutoff valve can trigger it without internet or mains power, as long as those devices have battery power and stay in radio range. That keeps protection going in a power or internet outage.
Range is YoLink’s claim to fame: up to 2,034 ft in open air, which reaches basements and separate garages where Wi-Fi sensors struggle. YoLink rates the housing IP66 (the Amazon listing says IP67; I go by YoLink).
It lost points on reach: water must reach the top or bottom probes on the puck itself, with no cable or remote disc. An 8.
YoLink also supervises each device around the clock (it calls this Smart Device Integrity Monitoring), so you can be told if a sensor stops reporting. It works with Alexa, Home Assistant and IFTTT, and one hub supports 300+ YoLink devices, per the listing.
My call: the best all-round kit, and the one to start with if a smart shutoff might follow.
100 dBIP665+ yr batteryLoRa, 1/4 mileGateway included
Buy it if
You want text-message alerts and a simple app, and your sensors sit in heated rooms.
Skip it if
You have pipes in an unheated crawl space or garage. Pick a sensor with temperature alerts.
The GoveeLife kit is the simplest way to get text alerts, and I’ve used it. It scored 9.0.
GoveeLife’s own page lists app and email alerts from the gateway, LoRa range it calls the industry’s longest at 1/4 mile, 2 top and 4 bottom sensor probes, and an IP66 waterproof rating. Its brand listing on Amazon adds SMS alerts.
The gateway (H5043) connects to your Wi-Fi and talks to the sensors (H5058) over LoRa. GoveeLife’s listing notes the gateway only supports 2.4 GHz Wi-Fi, which matters on mesh routers that hide the band. Phone alerts are a 10.
GoveeLife’s listing says each sensor sounds an alarm up to 100 dB and that one battery can last over 5 years under normal use. That’s a 10 on alarm and a 10 on battery.
The probes are the reason it catches small drips: with probes on top as well as the bottom, it can be set in a pan or on a shelf and still sense water from either side.
It lost points on freeze alerts. Neither GoveeLife’s page nor its listing mentions temperature sensing, so it’s a 6. For a basement or an unheated space, YoLink or Moen covers that.
Reach is the puck itself, with no cable or remote disc, so it’s an 8. GoveeLife says one gateway connects up to 100 sensors, so adding more later is easy.
It works with Alexa for voice reminders, per GoveeLife, and the app lets you name each sensor by location. The listing places it near toilets, water heaters, laundry machines, dishwashers, sinks and sump pumps, which matches where I’d put them.
My call: a strong pick for a heated home where text alerts are what you want.
Best for pairing with a Moen Flo shutoff
Moen Flo Detector 3-pack
Moen Flo Smart Water Detector, Wi-Fi water and moisture sensors, 3-pack, 920-005
Wi-Fi, no hub48 in. discCR123A, 2 yr0–140°F alerts1-yr warranty
Buy it if
You have or plan a Flo by Moen shutoff, or you need to sense water in a tight spot with the remote disc.
Skip it if
You want a loud local alarm and long battery life.
The Moen Flo detector is the one that connects to a Moen whole-house shutoff, and I’ve used it. It scored 7.8.
Moen’s spec sheet (920-004 and 920-005) says it’s a Wi-Fi device on the 2.4 GHz band with an iOS and Android app, so there’s no hub to buy. Phone alerts are a 10.
Reach is where it leads. Each detector comes with a wall mount and a 48 in. remote sensing disc, so the detector can sit on a baseboard while the disc goes under a fridge or behind a washer. Moen also sells a 6 ft leak sensing cable, 920-006, and up to 3 cables can be linked. That’s a 10.
It also watches humidity (customizable 0 to 100% RH) and room temperature (0 to 140°F), and reports battery level. Temperature alerts are a 10 for freeze warning.
The big feature: if a detector senses moisture, the app can tell a Flo by Moen Smart Water Shutoff on the main line to close. Our smart shutoff guide covers that valve.
It lost points in three places. The spec sheet doesn’t list an audible alarm volume, a 5. The CR123A lithium battery lasts up to 2 years, a 6. And no waterproof rating is published, a 6. The warranty is 1 year from delivery, per Flo Technologies.
Operating range is −20 to 140°F, so it handles a garage or a crawl space.
Moen says the detector can sit straight on the floor without its wall base, or mount on a wall or baseboard with the remote disc on the floor. It’s certified to FCC Part 15 and Industry Canada RSS-210, per the spec sheet.
My call: the pick when it’s part of a Moen Flo shutoff system, or when the remote disc solves a tight spot.
The three side by side
From each maker’s documents and brand listing, read Oct 23, 2026.
Sources: YoLink Water Leak Sensor 4 product pages (shop.yosmart.com) and brand listing; GoveeLife Water Leak Detector 2 page (us.govee.com) and brand listing; Moen Flo Smart Water Detector spec sheet 920-004/920-005. Where a listing and the maker’s page differ, we use the maker’s page.
Phone alerts: hub, gateway or direct Wi-Fi
A siren in an empty house helps nobody. How each kit reaches your phone decides how it behaves when things go wrong.
Kit
How alerts reach you
During an internet outage
YoLink
Hub online → app, email, SMS
Paired sirens and valves still work by D2D; local 105 dB alarm sounds
GoveeLife
Gateway on 2.4 GHz Wi-Fi → SMS, app, email
Local alarm sounds; no remote alert
Moen Flo
Each detector on 2.4 GHz Wi-Fi → app
No remote alert; Moen lists no alarm volume
Hubs and gateways use LoRa, a long-range radio, to talk to the sensors, then your router to reach your phone. That’s why YoLink and GoveeLife reach basements and garages that a Wi-Fi sensor can’t. The trade is one more box to plug in.
Direct Wi-Fi sensors like Moen’s skip the hub, but each one needs a solid 2.4 GHz signal where it sits. Check the signal at the water heater with your phone before you buy.
Battery life and maintenance
Sources: YoLink product page; GoveeLife brand listing; Moen spec sheet 920-004. Real life depends on alerts, temperature and signal.
A dead sensor is worse than none, because you think you’re covered. All three apps report battery level; turn those alerts on. Put a reminder in your calendar to test every sensor once a year by touching the probes with a damp cloth.
AAA batteries are easy to stock. CR123A cells cost more and are harder to find in a hurry, which is worth knowing with the Moen.
Freeze and temperature alerts
A burst pipe in winter does more damage than a slow drip. Two of the three can warn you first.
Kit
Temperature sensing
Use it for
YoLink
Low-temperature alerts, adjustable
Crawl spaces, garages, cabins
Moen Flo
Room temperature 0–140°F, humidity 0–100% RH
Basements, garages; humidity in a closet
GoveeLife
Not listed
Heated rooms only
Set the low-temperature alert a few degrees above freezing, so you have time to add heat or open a cabinet. Our heat tape for water pipes guide covers protecting the pipes themselves.
Where each sensor goes
Set sensors where water lands first, flat on the floor or in the pan.
Spot
Where exactly
Why
Tank water heater
In the drain pan, or on the floor at the base
Tanks fail at the bottom and the relief valve drains here
Washing machine
On the floor behind it, near the valves
Supply hoses burst under full pressure
Kitchen sink
On the cabinet floor under the trap
Drain and supply leaks both land here
Dishwasher and fridge
Under the front edge or behind
Use Moen’s remote disc where a puck won’t fit
Toilet
On the floor behind the bowl
Supply line and tank bolts leak here
Sump pump
Near the pit edge, not in the pit
Warns of a failed pump before water spreads
AC air handler
Next to the condensate pan
Clogged drains overflow in summer
Water runs to the low point, so a sensor an inch off the leak path can miss it. On a sloped floor, put it on the downhill side. Our sensor placement guide has photos of each spot, and water heater drain pan covers the pan itself.
Puck, disc or cable: how sensors find water
Type
How it senses
Best spot
Picks
Puck with bottom probes
Water bridges metal contacts under the unit
Flat floors, pans
YoLink, GoveeLife
Puck with top probes too
Also senses water dripping onto it
Under a supply valve or a shelf
YoLink, GoveeLife
Remote sensing disc
A small disc on a cord, away from the unit
Under fridges, behind washers
Moen (48 in. included)
Sensing cable
Water anywhere along the cable
Along a wall or around a tank
Moen 920-006 add-on
Most leaks start small and spread along the floor, so a puck in the right spot catches them. A cable makes sense where the leak could come from anywhere along a run, like a row of appliances or the full width behind a washer and dryer.
Top probes are underrated. A drip from a supply valve lands on top of the sensor long before it pools on the floor.
Testing sensors and avoiding false alarms
1
Test on day one
Touch the probes with a damp cloth; confirm the local alarm and the phone alert.
2
Test once a year
Same test, plus check battery levels in the app.
3
Keep probes clear
Don’t set sensors on a wet mop area or where you hose down a garage floor.
4
Mind condensation
A sensor right under a sweating cold-water pipe can alarm on drips that aren’t a leak; insulate the pipe.
5
Check offline alerts
Unplug the hub or gateway briefly and confirm you get an offline notice, where the app offers it.
A false alarm usually has a real cause: condensation, a mop, or a pet’s water bowl. Move the sensor a few inches or fix the moisture source rather than turning alerts off.
What about plain alarms with no app?
A battery spot alarm costs less and needs no Wi-Fi. It only helps if someone hears it.
A standalone alarm like the Resideo RWD21 just sounds where it sits; Resideo’s listing says it detects water 1/16 in. deep. That’s fine in a laundry room next to the kitchen. It does nothing when you’re at work or away for a week, which is when most leaks do their damage.
That’s why this page scores only connected kits. Plain alarms are a different kind of product, and I’d use them as extras in spots you pass every day, not as your main protection.
Setting up a kit the right way
1
Set up the hub or gateway first
Plug it in near your router; YoLink’s hub can use Ethernet, GoveeLife’s gateway needs 2.4 GHz Wi-Fi.
2
Pair and name each sensor
Name it by spot, like “water heater pan,” so an alert tells you where to run.
3
Turn on every alert type
Leak, battery, offline, and temperature where offered; add a second phone for a family member.
4
Place and test
Set each sensor, then touch the probes with a wet cloth and confirm the alarm and the phone alert.
5
Know your shutoff
Find the main shutoff and the fixture stops now, so you can act on the first alert.
An alert is only as good as your response. Our how to shut off your water main guide shows where to find it. If you’re away often, pairing sensors with an automatic shutoff valve turns an alert into a stopped leak.
How to choose in four questions
Question
If yes
If no
Pipes in an unheated space?
YoLink or Moen (temperature alerts)
Next question
Have or want a Moen Flo shutoff?
Moen Flo detectors
Next question
Need text messages, not just app alerts?
GoveeLife or YoLink
Next question
Large home, basement or detached garage?
YoLink (2,034 ft range)
GoveeLife
Stick with one brand per home. Each maker’s sensors only talk to its own hub or app, and adding sensors later is easiest within the same system.
Questions people ask
What is the best water leak detector?
On our spec score, the YoLink Water Leak Sensor 4 kit (9.7): hub included, a 105 dB alarm, freeze alerts and 5+ years per battery set.
Do water leak detectors need Wi-Fi?
For phone alerts, yes. YoLink and GoveeLife use a hub or gateway on your network; Moen’s detectors join 2.4 GHz Wi-Fi directly.
Will a leak detector work without internet?
The local alarm still sounds. YoLink sensors paired by D2D can also trigger YoLink sirens or valves without internet.
How long do leak sensor batteries last?
YoLink and GoveeLife list 5+ years; Moen lists up to 2 years for its CR123A.
Can a leak detector shut off the water?
Not alone. Moen’s can close a Flo by Moen shutoff, and YoLink sensors can trigger a YoLink valve.
How many leak sensors do I need?
One for each spot water could leak: usually the water heater, washer and kitchen sink first, then toilets and other appliances.
Can leak detectors warn of frozen pipes?
YoLink and Moen send temperature alerts. GoveeLife doesn’t list temperature sensing.
Where should a water heater leak sensor go?
In the drain pan or on the floor at the tank’s base, where a tank leak or relief valve discharge lands first.
How we picked these
Why trust me
I’m Isaac Daniels, a licensed journeyman plumber in Georgia (license #JP507711), and I’ve used all three picks. Every spec here comes from YoLink’s, GoveeLife’s and Moen’s own pages, spec sheets and brand listings, read Oct 23, 2026. Where I add my own advice, it’s labeled as my call.
How I pick
Only connected leak sensor kits that send phone alerts with what’s in the box, new and in stock on Amazon, checked the same day.
Each card’s spec score comes from the six checks below. All three score 7.0 or higher.
Plain battery alarms and automatic shutoff valves are different kinds of product and have their own place on the site.
The spec score, check by check
Six checks, one sixth each, 0 to 10, averaged to one decimal. The score reads makers’ published specs; it isn’t our own test, and buyers’ opinions play no part in it.
Check (weight)
How it’s scored
Phone alerts in the box (1/6)
10 when alerts work with only what’s included
Local alarm (1/6)
Published alarm of 100 dB or more 10; not published 5
Battery life (1/6)
5 years or more 10; 2 to 4 years 6
Freeze or temp alerts (1/6)
Temperature alerts published 10; none listed 6
Sensing reach (1/6)
Remote disc or cable included 10; probes on the unit only 8
Waterproof rating (1/6)
IP66 or better published 10; none published 6
Total
Average of the checks, to one decimal
Kit
Alerts
Alarm
Battery
Temp
Reach
Waterproof
Score
YoLink kit
10
10 (105 dB)
10 (5+ yr)
10
8
10 (IP66)
9.7
GoveeLife 2
10
10 (100 dB)
10 (5+ yr)
6
8
10 (IP66)
9.0
Moen Flo
10
5
6 (2 yr)
10
10 (48 in.)
6
7.8
Sources
YoLink (YoSmart), Water Leak Sensor 4 (YS7906) product pages and Water Leak Sensor 4 Starter Kit page (shop.yosmart.com): read Oct 23, 2026.
GoveeLife, Water Leak Detector 2 (H5043 + H5058) product page (us.govee.com): read Oct 23, 2026.
Moen, Flo by Moen Smart Water Detector specification sheet, models 920-004 and 920-005 (assets.moen.com).
Brand listings on Amazon for B0CCT7TH98 (YoLink), B0C3BB2X9J (GoveeLife), B08559ZTDK (Moen) and B00BIBD4EY (Resideo), read through the Creators API on Oct 23, 2026.
Google Search Console data for this page, Jul 23 to Oct 21, 2026.
