An instrument called a transducer converts one form of energy into another form. Boats use transducers to determine the depth, speed, and temperature of water. In this article, we will discuss the difference between these two types of transducers and the pros and cons of each. 

There are two main types of transducers used in boats: through-hull transducers and in-hull transducers.

In-Hull Transducers

A transducer mounted within the hull of a boat is called an in-hull transducer and is usually tucked away in the bilge or near the keel. An in-hull transducer does not protrude through the hull of the boat at all.

Thru-Hull Transducers

By-hull transducers are transducers mounted through the hull of a boat. They are typically mounted in the keel or near the waterline. Through-hull transducers protrude through the boat’s hull and are exposed to the water.

Why is there a difference between them?

Difference Between In-Hull and Thru-Hull Transducer

Difference Between In-Hull and Thru-Hull Transducer

Transducers that are mounted inside the hull of the boat as opposed to those that are mounted through the hull are the main difference between in-hull transducers and thru-hull transducers. A through-hull transducer is mounted through the hull of the boat and exposed to the water. This difference in location affects the transducer’s performance and installation process.

Since they are not affected by boat movement, in-hull transducers are more accurate than thru-hull transducers, but they are not as durable.

Since through-hull transducers are exposed to water and are less likely to be damaged by boat movement, they are typically more durable than in-hull transducers. The boat’s movement affects them, however, so they are not as accurate as in-hull transducers.

FAQs on In-Hull and Thru-Hull Transducer

Can I install an in-hull transducer in a fiberglass boat?

Using a fiberglass epoxy designed for use with in-hull transducers is necessary when installing transducers in fiberglass boats.

Can I install a thru-hull transducer in a wooden boat?

In wooden boats, thru-hull transducers can be installed, but they need to be sealed with a wood-specific sealant.

Can I use an in-hull transducer for fish finding?

Due to their lack of exposure to the water and lower accuracy, in-hull transducers are not suitable for fish finding.

Can I use a thru-hull transducer for depth sounder?

Yes, thru-hull transducers can be used for depth sounder.

Will a thru hull transducer work through aluminum?

Depending on the type of transducer and the thickness of aluminum, through-hull transducers can work through aluminum. It is possible to mount thru-hull transducers through an aluminum boat’s hull if they are designed specifically for use with aluminum. When choosing a transducer, make sure to review the manufacturer’s specifications and recommendations for the specific transducer you intend to purchase because the thickness of the aluminum can affect its accuracy. Thinner aluminum hulls are recommended to use transducers with a higher frequency to obtain better results.

Additionally, a through-hull transducer should be installed by a professional on an aluminum boat using an epoxy designed specifically for aluminum.

Conclusion

Two types of transducers are used in boats: in-hull transducers and thru-hull transducers. In-hull transducers are mounted inside the hull of a boat and do not protrude through the hull. It is important to note that there is a significant difference between these two types of transducers in the location and performance of the transducers. Through-hull transducers are mounted through the hull of the boat and they are exposed to the water. They are both different types of transducer, and both have their own advantages and disadvantages.

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