Smart Bilge Sensor


The Smart Bilge Sensor continuously monitors the water presence in the bilge and prevents not only a rapid sinking of your boat, but also a damage from the stale rain water accumulated in your bilge over a long time. The water detection is performed via a robust marine-grade float switch, which has to be held in a upward position for at least 30sec (to avoid possible false alarms). The high water alarm will be delivered to the boat owner and all additional emergency contacts via an automated voice call, SMS, email and push notifications. The email and push messages will be repeated every 3h until resolved. Optionally, the alert can also be forwarded to the selected Proactive Boat Care providers (marina, yacht service), enabling them to swiftly react and prevent potential disaster.

The sensor is also equipped with a temperature sensor, which will alert you of possible freezing hazard if the temperature falls below 2°C. The sensor performs a self-check every 24h and reports its health status to the network.

The sensor is wireless and connects directly to the internet. The installation is very simple with no connection to the electrical wiring. The sensor is powered by an internal battery lasting up to 7 years.

SKU: S4B-G2-RC1-BIL Category:


After one year you can choose to continue using the Sense4Boat service for the price of 50€ per year.
Learn more about the Sense4Boat subscription here.

Smart Bilge Sensor at a glance


Created specifically to withstand the harsh conditions in the engine room which include fumes, humidity and high temperatures.


Prevents sinking and damage caused by water intrusion. Place the float in any bilge just below a height where water starts being a problem.


The device communicates directly to the Sense4Boat control center through a specialised Sigfox IoT network. No SIM car or additional network costs are required.


Having its own replaceable batteries, this device does not use the boat’s power. Low energy consumption means you will need to replace the battery only every 5 to 7 years.

Prevent sinking and water damage

Water will always find a way to your bilge. Most often, it will just be rain water, which which will create mold and an unpleasant odor after a while.

However, since every boat has many water outlets (sanitary units, cooling systems) sometimes things can go wrong and your boat will be at risk of sinking.

You can prevent this hazard with this affordable sensor. Just install the sensor and water in the bilge will never surprise you again.

Monitor the water level in your bilge with the Sense4Boat app

Set emergency contacts which will be automatically contacted in case of potential danger.

If high water is detected in your bilge, the sensor will alert you via voice call, SMS, Push notification and email. Furthermore, if the sensor is connected to your marina, we will alert your marina as well.

Define alarm parameters to suit your specific needs, which can be different based on the boat’s type, geographical location of the marina and actual placement of the sensor.

Technical Specifications

Dimensions 120 x 75 x 40 mm
Weight  160 g
Housing Super strong, high temperature resistant polycarbonate casing
IP rating IP68 rated housing ensures device can withstand fine dust, high-pressure spray,
submersion for 30 mins in 1m of water, and extreme temperatures.
Installation Compact and easy to install.
Multiple installation options for easily securing the device to assets with screws, adhesive tape, etc..
Operating temperature -20°C to +85°C
Diagnostic LED Diagnostic LED signifies operation status


User-Replaceable Batteries 2 x AA Lithium-Batterie 3,6V 2600mAh
Battery life Up to 7 years
Supported Battery Types AA Lithium-Batterie 3,6V 2600mAh
*Please dispose of Lithium batteries in a safe and responsible manner


Sigfox The smoke sensor communicates directly to the Sense4Boat control center through a specialised IoT network. No SIM car or additional network costs are required.