Tankless water heaters are compact, efficient, and often tucked into utility areas where small leaks can go unnoticed until they become costly. A good smart leak detector can give you faster warning and help you act before water damage spreads.
Below, we’ve narrowed down the best options for alert speed, connectivity, range, and everyday reliability so you can choose the right protection for your setup.
Best 10 Smart Leak Detector for Tankless Water Heater Picks for 2026
Best for App Alerts
X-Sense Wi-Fi Leak Detector SWS54
- App-based leak notifications in real time
- 110 dB alarm plus base station for local alerts
- IP66 build suits humid utility areas
Best For: Homeowners who want phone alerts and simple monitoring for water heaters, basements, and bathrooms.
Best for Multi-Room Coverage
Winees WiFi Water Leak Detector 3-Pack
- Three sensors cover multiple leak-prone areas
- App, SMS, and email alerts improve response time
- IP66 waterproof design suits damp utility spaces
Best For: Homeowners who want to monitor multiple leak-prone spots around a tankless water heater with one hub-based system.
Best for Remote Alerts
Winees WiFi Leak Detector 3-Pack
- App, email, and SMS leak notifications
- Long-range hub supports basement placement
- 3 sensors cover multiple wet-risk areas
Best For: Homeowners who want remote leak alerts for basements, utility rooms, or multi-point coverage.
Best for Tight Spaces
X-Sense Wi-Fi Water Leak Detector Kit
- Slim sensor fits cramped tankless water heater areas.
- App alerts plus 100 dB alarm speed up leak response.
- Top and bottom probes catch drips and shallow water.
Best For: Homeowners needing a compact, app-connected leak alarm for tight tankless water heater installations.
Best for Everyday Use
Moen Flo Smart Water Leak Detector
- 24/7 moisture detection for early leak warnings
- Instant phone alerts through the Moen app
- Compact, flexible placement near water heaters and appliances
Best For: Homeowners who want connected leak alerts near a tankless water heater or other plumbing risk areas.
Best for Easy WiFi Alerts
- No hub required with direct app/email alerts
- 0.5mm detection helps catch tiny leaks early
- 100dB alarm and IP67 waterproof design
Best For: Homeowners who want an easy-to-set-up leak sensor for water heaters and utility spaces.
Best with Extra Features
Kidde WiFi Water Leak Detector & Freeze Alarm
- App alerts for leaks and freezing conditions
- Compact, battery-powered placement near water heaters
- Alexa, Google Home, iPhone, and Android compatible
Best For: Homeowners who want a compact leak alarm with smartphone notifications for water heaters and utility spaces.
Best Long-Range Coverage
GoveeLife Smart Water Leak Detector 2-Pack
- 1804 ft long-range wireless coverage
- SMS, app, and email leak alerts
- 105 dB alarm with 5-year battery life
Best For: Homes with tankless water heaters in basements, garages, or other distant utility areas.
Best for No-Hub Alerts
SwitchBot WiFi Water Leak Detector
- No hub required with Wi-Fi app/email alerts
- 100dB alarm with adjustable mute option
- IP67 waterproof design and long battery life
Best For: Homeowners who want a simple, hub-free leak sensor for tankless water heaters and other utility areas.
Best for App Alerts – X-Sense Wi-Fi Leak Detector SWS54
If you want a smart leak detector for tankless water heater installations, the X-Sense SWS54 is a practical pick thanks to its app alerts, loud local alarm, and included base station. It’s designed to catch small leaks early and push notifications to your phone, which is especially useful for equipment tucked away in a utility room, basement, or closet.
Best For: Homeowners who want remote alerts and a simple multi-sensor setup for monitoring water heaters and other leak-prone areas.
Pros:
- Pushes real-time alerts through the app when a leak is detected
- Very loud 110 dB alarm helps nearby occupants notice fast
- High-sensitivity sensing can catch very small amounts of water early
- IP66 rating makes it a strong fit for humid utility spaces
Cons:
- Requires 2.4 GHz Wi-Fi and the included base station
- Not a standalone smart home sensor without the X-Sense ecosystem
For buyers comparing a smart leak detector for tankless water heater use, this model stands out more for dependable alerts and coverage than for advanced automation. It’s a solid choice if you mainly want fast notification, a loud alarm, and the flexibility to monitor several common leak spots from one system.
Best for Multi-Room Coverage – Winees WiFi Water Leak Detector 3-Pack
If you want a smart leak detector for tankless water heater areas, this Winees 3-pack is a practical pick for spreading sensors across the heater closet, laundry room, or nearby basement spots. It pairs with a hub for app alerts and adds SMS and email notifications, which is useful when a small leak could turn into a bigger problem fast.
Best For: Homeowners who want to monitor multiple leak-prone spots around a tankless water heater with one hub-based system.
Pros:
- Three sensors let you cover multiple areas around the heater and plumbing.
- App, SMS, and email alerts help catch leaks quickly.
- 100-meter transmission is useful for farther-off locations like basements.
- IP66 waterproof housing is built for humid or damp spaces.
Cons:
- Hub is not included, so this is not a standalone setup.
- Works on 2.4GHz WiFi only.
- May be more sensor than you need for a single small leak point.
For buyers who already have or plan to use the Winees hub, this is a solid smart leak detector for tankless water heater monitoring because it combines multi-zone coverage with remote alerts and flexible placement. It is especially appealing if you want to protect more than one area without adding extra complexity.
Best for Direct Wi‑Fi Alerts – X-Sense Wi-Fi Leak Detector
If you want a smart leak detector for tankless water heater installs without adding a hub, the X-Sense SWS0B is a practical choice. It connects directly to Wi‑Fi for app alerts, adds a loud local alarm, and uses top and bottom probes to catch both drips and pooling water early.
Best For: Homeowners who want a simple, app-connected leak sensor for tight utility areas, basements, or beside a tankless water heater.
Pros:
- Wi‑Fi direct to app, so no hub or base station is needed
- 6 probes help detect drips from above and water on the floor below
- Low-temperature alerts add freeze protection at 39 °F
- Compact IP66 design fits under water heaters and in damp spaces
Cons:
- Works only on 2.4 GHz Wi‑Fi, not 5 GHz
- Single-sensor pack may be limiting for multi-point coverage
- App-first design may not suit users who want a full hub-based system
For a smart leak detector for tankless water heater setups, this model stands out for easy placement and direct alerting rather than system complexity. It is a strong fit if you want quick setup, dependable notifications, and extra freeze monitoring in one compact sensor.
Best for Remote Alerts – Winees WiFi Leak Detector 3-Pack
If you want a smart leak detector for tankless water heater areas, the Winees 3-pack is built for monitoring spaces where you may not be standing nearby. It combines app alerts, email/SMS notifications, and a long wireless transmission range, making it useful for basements, utility rooms, and other hard-to-check spots.
Best For: Homeowners who want remote leak alerts across multiple damp-prone areas, especially when the water heater sits in a basement or utility closet.
Pros:
- App, email, and SMS alerts help you react quickly to leaks
- 200M transmission range is helpful for distant basement installs
- 3-pack coverage works well for multiple risk points around the home
- Adjustable alarm volume plus mute controls adds flexibility
Cons:
- Requires 2.4GHz WiFi only
- Not a dedicated tankless water heater sensor, so placement matters
- Alarm and notification features may be more than casual users need
For buyers comparing a smart leak detector for tankless water heater setups, this Winees kit stands out for distance, multi-channel alerts, and easy expansion. It is a practical choice if your priority is catching leaks early even when the equipment is out of sight.
Best for Tight Spaces – X-Sense Wi-Fi Water Leak Detector Kit
If you need a smart leak detector for tankless water heater installs, this X-Sense kit is built for quick placement in cramped mechanical rooms, under units, and near drip-prone spots. It combines loud local alarms with app alerts, so you can catch leaks early whether you’re home or away.
Best For: Homeowners who want a slim, app-connected leak alarm that can fit into tight spaces around a tankless water heater.
Pros:
- Ultra-slim sensor design makes it easier to place near compact tankless setups.
- App alerts and a 100 dB base station help flag leaks quickly.
- Top and bottom probes detect drips and shallow water.
- Long wireless range is useful for basements, outbuildings, or remote utility areas.
Cons:
- Requires Wi-Fi/base-station setup, so it is less “plug-and-forget” than a basic alarm.
- Works as a detection system, not a shutoff valve for stopping water automatically.
- More feature-rich than some users need if they only want a simple beeper.
Overall, this is a strong smart leak detector for tankless water heater monitoring when space is limited and remote alerts matter. Its slim sensor profile and app-based notifications make it a practical choice for catching small leaks before they turn into bigger problems.
Best for Everyday Use – Moen Flo Smart Water Leak Detector
Moen Flo Smart Water Leak Detector, Drip or Flood Sensor Alarm for Home, 1-Pack, White, 920-004
Check Price On AmazonIf you want a smart leak detector for tankless water heater installations, the Moen Flo Smart Water Leak Detector is a practical pick for spotting moisture early and sending alerts straight to your phone. It’s designed for wet-prone spots like water heaters, basements, and laundry areas, and it works especially well when you want simple, always-on monitoring rather than a complex setup.
Best For: Homeowners who want app-based leak alerts and flexible placement near a tankless water heater or other at-risk plumbing areas.
Pros:
- 24/7 moisture detection helps catch small leaks before they become bigger problems
- Instant app alerts make it easy to respond quickly, even when you’re away
- Works as a standalone detector or as part of the Moen Smart Water Network
- Compact design is easy to place near a tankless water heater, sink, or appliance
Cons:
- Requires 2.4 GHz Wi‑Fi for smart features and notifications
- Single-sensor design means you may need multiple units for full-home coverage
For buyers comparing options for a smart leak detector for tankless water heater use, this Moen model stands out for easy app alerts and flexible placement. It’s a strong fit if you want a connected detector that can scale with the rest of your home water-monitoring setup.
Best for Easy WiFi Alerts – SwitchBot WiFi Water Sensor
If you want a smart leak detector for tankless water heater setups without adding a hub, the SwitchBot WiFi Water Sensor is a practical option. It sends app and email alerts over 2.4GHz WiFi, includes a loud local alarm, and uses sensitive probes that can catch small leaks before they turn into costly damage.
Best For: Homeowners who want simple remote leak notifications and a compact sensor for water heaters, basements, or utility areas.
Pros:
- No hub required, with direct WiFi app and email alerts
- Very sensitive 0.5mm leak detection for early warnings
- 100dB alarm plus app mute for fast, flexible response
- IP67 waterproof build and up to 2 years of battery life
Cons:
- Requires 2.4GHz WiFi, so it won’t work on 5GHz-only networks
- Not a full shutoff system on its own
- Smart features are strongest if you already use the SwitchBot ecosystem
For buyers comparing a smart leak detector for tankless water heater installations, this model stands out for straightforward setup and strong alerting rather than advanced automation. It’s a solid fit if you mainly want early leak detection and remote notifications in a compact, durable sensor.
Best with Extra Features – Kidde WiFi Water Leak Detector & Freeze Alarm
If you want a simple smart leak detector for tankless water heater setups, the Kidde WiFi Water Leak Detector & Freeze Alarm is a practical choice. It adds app alerts, Alexa/Google Home support, and freeze monitoring, making it useful anywhere a hidden drip or cold snap could cause damage.
Best For: Homeowners who want an easy-to-install, battery-powered leak alarm with smartphone notifications for water heaters, basements, and utility areas.
Pros:
- Sends mobile alerts when it detects water or freezing conditions
- Compact, battery-powered design fits near water heaters and other tight spots
- Works with Alexa, Google Home, iPhone, and Android devices
- Includes an audible 85-decibel alarm for on-site warning
Cons:
- No built-in shutoff valve or automatic water shutoff
- Designed for detection only, so it won’t stop a leak on its own
For buyers who mainly need timely alerts rather than a full plumbing control system, this Kidde unit covers the basics well. It’s a solid smart leak detector for tankless water heater installations where placement, app notifications, and freeze sensing matter more than advanced automation.
Best Long-Range Coverage – GoveeLife Smart Water Leak Detector 2-Pack
If you need a smart leak detector for tankless water heater installations in a basement, utility room, or a detached mechanical space, this GoveeLife set stands out for reach and alerts. Its long-range Sub-1G connection, 105 dB siren, and phone notifications make it easier to catch leaks quickly before they spread.
Best For: Homes with remote water-heater setups, basements, and larger properties where a strong wireless signal matters.
Pros:
- Up to 1804 ft of wireless range helps cover far-off utility areas.
- Sends SMS, app push, and email alerts for faster response.
- 105 dB alarm plus four volume levels lets you tune the warning.
- IP67 rating and 5-year battery life add durability and low maintenance.
Cons:
- Requires the included gateway and 2.4 GHz Wi‑Fi for remote features.
- Not a standalone sensor system for users without app-based alerts.
For a smart leak detector for tankless water heater spaces that are hard to reach, this model is especially appealing because it combines long-range coverage with multiple alert paths. It’s a practical choice when the heater sits in a basement, garage, or other out-of-the-way area.
Best for No-Hub Alerts – SwitchBot WiFi Water Leak Detector
If you want a smart leak detector for tankless water heater installs without adding another hub, this SwitchBot sensor is a practical pick. It connects directly to 2.4GHz Wi-Fi, sends app and email alerts, and uses a loud 100dB alarm to help catch leaks fast.
Best For: Homeowners who want a simple, hub-free water leak sensor for heaters, basements, laundry areas, or other leak-prone spots.
Pros:
- No hub required, with real-time app and email notifications
- High-sensitivity probes can detect very small leaks and dripping
- 100dB alarm plus mute option for flexible home use
- IP67 waterproof build and up to 2 years of battery life
Cons:
- Requires 2.4GHz Wi-Fi only
- It is a detector, not a shutoff valve or automatic water stop system
- Extended probe is useful, but setup may take some placement tuning
For buyers comparing a smart leak detector for tankless water heater protection, this model stands out for easy setup and strong alerting rather than advanced automation. It is a solid fit if your priority is getting immediate leak warnings without extra hub hardware.
How We Picked the Best Smart Leak Detector for Tankless Water Heater
For a Smart Leak Detector for Tankless Water Heater use, we prioritized fast sensing, dependable alerts, and placement flexibility. We also looked at app notifications, audible alarm volume, wireless range, battery considerations, and whether the sensor design makes sense for tight spaces near plumbing, drains, and wall-mounted units.
Because tankless systems are often installed in garages, closets, basements, or exterior enclosures, we favored detectors that can handle real-world conditions and still send timely warnings.
Quick Comparison
Most buyers will choose between simple standalone sensors, Wi-Fi-connected models with app alerts, and more advanced systems that add temperature monitoring or hub-based range expansion. If your heater sits far from the router, range and signal stability matter as much as sensor accuracy. If it is in a visible utility room, loud alarms and app push alerts may be enough.
Key Buying Factors for a Smart Leak Detector for Tankless Water Heater
Alert Speed and Notification Type
The best detectors react immediately and give you more than one way to know something is wrong. Look for app push alerts, SMS or email notifications, and a loud local alarm. That combination matters when the heater is out of sight or you are away from home.
Sensor Placement and Size
Tankless units are often mounted in tight spots, so a low-profile sensor can be easier to position near supply lines, drain pans, or the floor beneath the unit. Make sure the contact points can sit where water is most likely to collect.
Connectivity and Range
Wi-Fi is convenient, but range and stability determine whether alerts reach you reliably. If the heater is far from your router, consider models with long transmission distance or hub-based setups that improve coverage through walls and around appliances.
Extra Protection Features
Some models add freeze alerts, adjustable alarm volume, or temperature monitoring. Those features can be valuable if your tankless water heater is installed in an unconditioned area where cold weather or temperature swings could increase risk.
Who Should Buy Which Smart Leak Detector for Tankless Water Heater?
If you want the simplest setup, choose a compact Wi-Fi sensor with app alerts and a loud alarm. If your heater is in a remote location, prioritize long-range connectivity or a hub-supported system. If you want broader home protection beyond the heater, a multi-sensor kit can cover nearby risk points like sinks, laundry connections, and utility floors.
For buyers who want the most complete peace of mind, the best choice is a detector that combines fast leak detection, strong wireless range, and clear notifications you will actually see in time.
