Best Water Leak Detectors for Water Heaters and Basements

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Water damage comes from a short list of places. A tank water heater fails at the bottom seam or a fitting, usually after a decade, and runs until someone notices. A washing-machine supply hose bursts under full pressure. A sump pump stops in a storm. An under-sink trap or supply line drips into a cabinet for weeks. A leak sensor in each of those spots turns a flooded floor into a phone alert, and the water-heater one is the cheapest insurance on a tank that is past its expected life — our water-heater replacement calculator will tell you where yours stands.

There are three architectures. Wi-Fi kits pair a small plug-in gateway with battery sensors; there is nothing to wire, but the gateway needs a 2.4 GHz network and the sensors must be in radio range of it. Hub-based systems using LoRa trade a dedicated hub for much longer range through walls and floors and multi-year battery life, which is what you want for a sump pit or a detached garage. Automatic shutoff valves are different animals: a motorised valve on the main water line that measures flow and pressure and closes itself when it sees a leak. Only the valve stops the water; the sensors only tell you about it.

Sensor design matters at the water heater. Puck sensors have contacts on the base and need to sit where the water will pool — in the drain pan, not beside it. Cable-probe sensors run a length of sensing cable around the base of the tank or along a wall and trigger anywhere along it. Alarm loudness is useful if someone is home; the app alert is the part that works when nobody is. Battery life figures on this page are the makers' own and assume the sensor is not constantly alarming.

What none of the sensors do is close a valve. If the house sits empty for weeks, or the water heater is on a finished floor, pair sensors with a shutoff valve installed by a plumber. And an alert needs a phone with the app installed and notifications allowed; set it up on two phones if two people might be the one at home.

How we picked

Maker-stated battery life, alarm level and radio range, not retailer copy
Alerts that reach a phone when nobody is home, and a stated requirement (gateway, hub, Wi-Fi band) for them
Sensor construction suited to the spot: contacts on the base, cable probes or an in-line valve
Ingress rating on the sensor, since it will get wet by design
A shutoff option for the house — on this page, a valve certified for drinking-water contact
Published warranty and certifications

We do not accept payment for placement and we do not publish star ratings we did not measure. Specifications come from each manufacturer's published spec sheet.

Side by side

Product	Type	Best for	In the box	Warranty	Sensor link	Alarm	Alerts	Detection	Ingress	Works with
Govee GoveeLife Water Leak Detector 1s (H5044 gateway + H5059 sensors)	Wi-Fi gateway + battery sensors	A first leak-alarm kit for the water heater, washing machine and under-sink spots in a house with 2.4 GHz Wi-Fi	1 Wi-Fi gateway + 3 sensors (5- and 8-sensor kits and add-on sensors also sold)	1 year	Sub-1 GHz radio, up to 550 m / 1,804 ft to the gateway (Govee's figure)	0–105 dB, four volume levels set in the app; one-tap silence; red flash	Sound on the sensor, email and app push notifications; 'Find Device' beep	Dual sensor probes; Govee: drips and floods within 2 seconds	IP67	Govee Home app; Google, Alexa, IFTTT
YoLink Water Leak Sensor 1 Starter Kit — Hub + 4 Sensors (YS1603 + 4 × YS7903)	LoRa hub + battery sensors	Big or multi-level homes, basements and outbuildings where range and battery life matter more than a built-in siren	1 YoLink Hub (YS1603), 4 Water Leak Sensor 1 (YS7903), quick-start guides	2 years (sensor)	LoRa, up to 2,034 ft (620 m) open air to the hub	None on the sensor — silent; pairs device-to-device with a YoLink siren (sold separately)	—	Built-in probes on the top and bottom of the sensor	IP68 sensor housing; indoor use	—
Moen Flo Smart Water Monitor and Shutoff, 3/4 in (900-001)	Automatic shutoff valve on the main	Whole-house protection — a second home, a finished basement, or any house where a leak would run for hours before someone noticed	Valve, two 3/4 in NPT brass tailpieces, AC adapter, spare o-rings, installation spacer, hex key	1 year; FloProtect subscription extends to 5 years and adds up to $5,000 deductible coverage	—	—	App, phone call, text and email (Moen Smart Water app)	—	—	Amazon Alexa, Google Assistant, Alarm.com, Ring

The picks

#1 · Wi-Fi gateway + battery sensors

Govee GoveeLife Water Leak Detector 1s (H5044 gateway + H5059 sensors)

Check price on Amazon(paid link)

A plug-in 2.4 GHz Wi-Fi gateway and three battery sensors with dual probes, a 105 dB alarm you can turn down from the app, a stated 5-year battery life and an IP67 housing — the simplest kit to put under a water heater, washer and sink.

Best for: A first leak-alarm kit for the water heater, washing machine and under-sink spots in a house with 2.4 GHz Wi-Fi

In the box: 1 Wi-Fi gateway + 3 sensors (5- and 8-sensor kits and add-on sensors also sold)
Model: H5044 gateway, H5059 sensor — the gateway pairs only with GoveeLife H5059 sensors
Gateway: 2.4 GHz Wi-Fi only; 110–240 V plug-in; up to 64 sensors
Sensor link: Sub-1 GHz radio, up to 550 m / 1,804 ft to the gateway (Govee's figure)
Alarm: 0–105 dB, four volume levels set in the app; one-tap silence; red flash
Alerts: Sound on the sensor, email and app push notifications; 'Find Device' beep
Detection: Dual sensor probes; Govee: drips and floods within 2 seconds
Battery: Battery powered; up to 5 years (Govee)
Ingress: IP67
Works with: Govee Home app; Google, Alexa, IFTTT
Warranty: 1 year

No hub to wire — the gateway plugs into a wall outlet and the sensors just need to be within radio range
Loud enough to hear from upstairs, and adjustable so a bedroom sensor doesn't scream at 3 a.m.
Five-year stated battery life and an IP67 shell, so a sensor that sits in a drip pan survives getting wet
Adds sensors cheaply up to 64 per gateway

Govee's FAQ is explicit: the sensors require the gateway for app alerts — a bare sensor pack only beeps
2.4 GHz Wi-Fi only; a router that merges bands can make pairing fiddly
Detects and alarms — it cannot close a valve; add a shutoff such as the Moen Flo for that
One-year warranty, the shortest here

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#2 · LoRa hub + battery sensors

YoLink Water Leak Sensor 1 Starter Kit — Hub + 4 Sensors (YS1603 + 4 × YS7903)

Check price at YoLink

A LoRa hub on Ethernet or 2.4 GHz Wi-Fi with four silent, IP68 leak sensors rated for 5+ years on two AAA cells and up to 2,034 ft open-air range — the kit for a basement, a detached garage or a long house where Wi-Fi sensors drop out.

Best for: Big or multi-level homes, basements and outbuildings where range and battery life matter more than a built-in siren

In the box: 1 YoLink Hub (YS1603), 4 Water Leak Sensor 1 (YS7903), quick-start guides
Hub: Ethernet or 2.4 GHz Wi-Fi; app alerts require internet and continuous hub power
Sensor link: LoRa, up to 2,034 ft (620 m) open air to the hub
Sensor battery: 2 AAA alkaline per sensor; 5+ years (YoLink)
Alarm: None on the sensor — silent; pairs device-to-device with a YoLink siren (sold separately)
Detection: Built-in probes on the top and bottom of the sensor
Ingress: IP68 sensor housing; indoor use
Operating range: 32–122 °F (0–50 °C)
Sensor size: 2.44 × 2.44 × 0.96 in
Warranty: 2 years (sensor)

LoRa reaches the sump pit, the far end of a basement or a detached building that 2.4 GHz Wi-Fi sensors can't
Five-plus years on two AAA cells and an IP68 housing — fit and forget
Hub on Ethernet, so the alerts don't depend on Wi-Fi being up
Four sensors in the kit, one hub for the whole YoLink ecosystem — sirens, valve controllers and more add on later

The sensors are silent: without a YoLink siren, the only alarm is the notification on your phone
Everything goes through the hub — if it loses power or internet, app alerts stop (device-to-device pairings keep working)
Amazon's YoLink kits bundle a siren and don't match this kit's contents, so the buy link goes to YoLink's own store
No shutoff — pair it with YoLink's valve controller or a Moen Flo if you want the water stopped

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#3 · Automatic shutoff valve on the main

Moen Flo Smart Water Monitor and Shutoff, 3/4 in (900-001)

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A motorised valve installed on the main cold-water line that measures flow, pressure and temperature, runs a daily micro-leak test, learns the household's usage, and closes itself when it sees a leak — the only product here that stops the water.

Best for: Whole-house protection — a second home, a finished basement, or any house where a leak would run for hours before someone noticed

Pipe: 3/4 in main (900-001); 1 in and 1-1/4 in models sold separately
Measures: Flow, pressure and temperature; daily automatic MicroLeak tests
Sensitivity: Leaks as small as a drop per minute (Moen)
Shutoff: Automatic on a detected leak; remote and manual shutoff from the app
Learning: FloSense learns the home's usage pattern to flag abnormal flow
Alerts: App, phone call, text and email (Moen Smart Water app)
Power: AC outlet (100–240 V) with continuous power near the valve; 12 V DC adapter with 10 ft cable included; 25 ft extension sold separately
Wi-Fi: 802.11 b/g/n, 2.4 GHz
Pressure / temperature: Max operating pressure 175 psi; ambient 32–140 °F
Install: On the accessible main cold supply after the meter, shutoff and pressure-regulating valve; Moen recommends a licensed plumber
Certifications: IAPMO IGC 349; UL 1951, CSA C22.2 No. 14 and 68; NSF 61/9 and NSF 372; FCC Part 15
Works with: Amazon Alexa, Google Assistant, Alarm.com, Ring
Warranty: 1 year; FloProtect subscription extends to 5 years and adds up to $5,000 deductible coverage
In the box: Valve, two 3/4 in NPT brass tailpieces, AC adapter, spare o-rings, installation spacer, hex key

Closes the main automatically — a burst washer hose at 2 a.m. becomes a puddle, not a flooded floor
Catches the leaks sensors never see: a pinhole in a slab line or a running toilet shows up in the daily pressure test
Flow, pressure and temperature on the app, with a freeze warning when the line gets cold
Certified to NSF 61/372 for drinking-water contact and listed to UL 1951

A plumbing job on the main: Moen recommends a licensed plumber, and the valve needs a nearby powered outlet
Standard warranty is one year; the 5-year coverage is tied to the FloProtect subscription
Only watches water that passes through it — a leaking water-heater tank or a sump failure still needs a floor sensor (Moen sells its own Flo Smart Water Detector)
Needs 2.4 GHz Wi-Fi and continuous power; it keeps its position on a power cut but can't alert

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Working out what you need before you buy? Read the heating, cooling & water heating guides.