What Tank Level Sensor Should I Use in my Camper Van?
Comparing Blue Sea KUS Water Tank Sensors and Garnet Sensors
Tank level sensors seem simple until you install the wrong one. Blue Sea is a tank level reader, that pairs with a tank float like KUS sensors. Garnet is an electrical taped pressure sensor that can be installed without drilling holes in the tank, and has it’s own display. Both have integrations with Victron, EcoFlow, and popular power system displays.
For install this is one of the most common pain points builders and DIY van owners run into because sensors, touch plumbing, wiring, dashboards, and user experience all at once.
This guide explains the three most common camper van tank level sensors, how they work, and which one makes sense for different builds.
Why Tank Level Sensors Matter More Than You Think
Water anxiety is often not caused by running out of water but by not knowing how much you have left. A reliable tank level sensor removes guesswork, prevents surprise refills, and makes your water system easier to trust.
The Three Most Common Camper Van Tank Level Sensors
The vast majority of van builds use one of three sensor systems.
Each solves the same problem in a different way.
KUS Water Tank Sensors
Affordable and Widely Used
KUS sensors are the most common and affordable tank level sensors in the vanlife world. They use a float style probe that mounts vertically inside the tank and physically moves with the water level. The sensor outputs a resistance signal that can be read by compatible displays.
KUS sensors typically cost around eighty dollars and are widely available online. They are commonly paired with Victron Cerbo GX systems or EcoFlow setups using compatible inputs.
KUS sensors are a good choice if you want a simple reliable solution and are comfortable planning sensor depth correctly before installation.
More information can be found at https://kus-usa.com.
Things to Watch Out for With KUS Sensors
Float sensors require careful placement.
If the probe length is not exactly 1” less than your tank depth, readings will be inaccurate. It is also important to reference your tank drawings before ordering, especially for wheel well tanks with irregular shapes.
Once installed correctly, they are dependable and low maintenance.
Garnet SeeLevel Tank Sensors
Premium External Sensor Solution
Garnet sensors are considered a premium option for sensors in camper van water systems. Instead of mounting inside the tank, Garnet sensors adhere to the exterior wall and measure water level through the tank using pressure sensing technology. This eliminates penetrations and moving parts.
The system uses a 12 volt display and draws very little power. Retail pricing is typically around $200.
Garnet sensors are especially popular with high end builders because of their clean install and reliability.
Learn more at https://www.garnetinstruments.com.
When Garnet Sensors Make the Most Sense
Garnet sensors are ideal if you want:
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No holes in the tank
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No internal moving parts
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A clean professional install
They work especially well on rectangular tanks and are commonly used in premium builds where serviceability and aesthetics matter.
Blue Sea Systems Gauges
Display and Integration Focused
Blue Sea Systems is best known for electrical components, but their tank level gauges are commonly used as displays paired with other sensor inputs.
Many builders use Blue Sea gauges alongside KUS sensors to display water levels on a clean dedicated panel rather than through a digital control system.
Blue Sea products are known for durability, marine grade reliability, and clear labeling.
More information can be found at
https://www.bluesea.com
Choosing Between Digital Displays and System Integration
One major decision is how you want to view tank levels. Some users prefer digital integration through systems like Victron or EcoFlow. Others want a simple dedicated gauge on the wall. The last option could be a sightglass to see directly into your water tank.
KUS sensors integrate well with both approaches. Garnet systems include their own display. Blue Sea gauges are often used when a standalone visual indicator is preferred.
Common Installation Mistakes to Avoid
The most common mistakes include:
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Ordering the wrong probe length
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Ignoring tank shape when placing sensors
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Failing to plan wiring routes early
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Assuming all sensors work with all displays
Always reference tank drawings and system compatibility before purchasing sensors.
Builder Recommended Sensor Choices
Based on real world installs, many builders recommend:
Budget friendly and simple
KUS sensors
Clean install and premium builds
Garnet SeeLevel sensors
Standalone gauges and marine grade hardware
Blue Sea Systems displays
Each option works well when matched correctly to the build.
Final Thoughts on Tank Level Sensors
There is no universally best tank level sensor. The right choice depends on your tank shape, budget, wiring preferences, display style, and tolerance for complexity.
A properly chosen and installed sensor dramatically reduces water anxiety and makes your camper van water system easier to live with day after day.
