Smart Heat Sensor


The sensor continuously monitors (every 6sec) the temperature in the enclosed space (such a engine room or electrical cabinets) and warns you about extreme temperatures or sudden temperature rise as a possible indication of fire. The sensor can also warn you about low temperatures which might lead to freezing. The alert is delivered to the boat owner and all his emergency contacts via an automated voice call, SMS, email and push notifications. Optionally, the alert can also be shared with the selected Marina Link providers (marina, yacht service), enabling them to swiftly react and prevent potential disaster. All temperature measurements can be monitored via a user-friendly smartphone application.

The sensor is designed to operate at high temperatures on long terms (85°C) and even up to 5min @ temperature of 130°C.

SKU: S4B-G1-RC1-HEA 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 Heat Sensor at a glance


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


The device detects even the slightest changes in temperature, and transmits the data to our control center which automatically notifies you and your marina of the potential danger.


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.

Detect a potential fire on time

Prevention of fire on a boat stored/docked in the marina is a very demanding challenge. The fire is usually spotted at a very late stage, at which it already had developed high temperatures and even spread to the adjacent boats. Motor boats are at particularly high risks, having different kinds of of fire-risky equipment (engines, chargers, batteries, fuel, pumps) concentrated in a very small area of the engine room.

The temperature in the engine room can under normal engine operation rise up to 70°C. Smoke detectors work at temperatures of up to 55°C and cannot be designed with IP65 protection required for the engine room which makes them useless for this purpose.

Prevent freezing

Very often the boats are exposed to extreme cold as well, which might lead to freezing of the fluids and possible damage of the pipes, valves or tanks. The outside temperature often does not correlate with the inside temperature, so one must measure the temperature inside the engine room to estimate the possible risk of freezing.

This sensor warns you when the temperature in your engine room drops below a predefined threshold, enabling you or your marina to take appropriate protective measures.

Specially designed for boats

In the cooperation with a leading hardware manufacturer based on the Sigfox technology, we designed a special sensor which continuously monitors the temperature (every 6 sec) and detects the smallest change in the temperature. Every temperature difference of 2°C is sent and processed in the cloud.

Whenever the temperature exceeds a specified threshold or rises faster than normal, an alert is generated as a possible indication of fire. The alert is forwarded to you (and optionally your home marina/port).

The sensor is designed to operate at high temperatures (up to 85°C)
and even up to 5min at a temperature of 130°C.


While extremely useful at detecting temperature changes, this sensor is not a life-saving device nor certified as a fire alarm system by fire regulations and authorities.
The measurements from the sensors should be used for information purposes only.

Monitor the engine room temperature with the Sense4Boat app

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

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 94 x 65 x 32,5 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..
Measurement range -5°C to +122°C
Operating temperature

-20°C to +85°C
up to 5 minutes at +150°C

Diagnostic LED Diagnostic LED signifies operation status


User-Replaceable Batteries 2 x AA Lithium-Batterie 3,6V 2600mAh
Battery life Up to 5 years
Supported Battery Types AA Lithium-Batterie 3,6V 2600mAh
*Please dispose of Lithium batteries in a safe and responsible manner


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