Best Thru Hull Depth Transducers for Accurate Boat Depth Readings
Answering the question “which thru hull depth transducer should I buy?” this guide highlights five dependable options for American boaters. Whether you prioritize speed, temperature sensing, or ease of installation, these transducers deliver clear depth readings and reliable performance. Best for saltwater cruisers, powerboat racers, or anglers seeking steady shore-to-hull depth data, each option suits different hull types and installation needs. Below is a quick summary table followed by detailed product sections to help you compare features side by side.
| Product | Brand | Best For | |
|---|---|---|---|
| Airmar XDR-AMR-P19-9150 | Hawkeye | General depth with 200 kHz | Requires cutting a 2″ hole |
| HawkEye DT2BX-TH | Hawkeye | Integrated depth with air/water temp | Thru-hull, 2″ hole; temp sensors |
| Furuno 525T-BSD | Furuno | Temperature included bronze transducer | Includes fairing block |
| Airmar 31-338-1-01 | Airmar Transducers | High-performance 200 kHz depth | 3″ max hull thickness; 2″ cutout |
| Raymarine A22154 DST800 | Raymarine | Depth, Temp, Speed setup | Thru-hull model with multiple readings |
Airmar XDR-AMR-P19-9150 Universal Airmar 200Khz Thru-Hull Transducer
The Airmar XDR-AMR-P19-9150 is a 200 kHz thru-hull transducer designed for reliable depth readings. It is best for boaters who need a straightforward depth solution with a compatible display. Who should consider this: the captain seeking a robust, widely compatible 200 kHz option that can be integrated with existing displays. Caution: installation requires drilling a 2″ hole in the hull and may require modification to existing wiring by cutting the HawkEye plug to connect to your display.
HawkEye DT2BX-TH In-Dash Depth Sounder with Air and Water Temperature
The HawkEye DT2BX-TH combines depth with air and water temperature readings in a compact in-dash unit. It includes a thru-hull transducer and is well-suited for boaters who want a ready-to-install depth/sensor package in a single unit. Best for: anglers and recreational skippers who value quick depth reads plus temperature data. Limitation: like other thru-hull sensors, it requires a 2″ hull hole and may necessitate professional installation for some hulls.
Furuno 525T-BSD Bronze Thru-Hull Transducer with Temperature
The Furuno 525T-BSD is a bronze thru-hull transducer with built-in temperature sensing and a fairing block. It supports 50/200 kHz sonar and provides dependable depth readings with temperature data. Choose this if you need a bronze hull-compatible model built for durability and longer system life. Caution: installation requires precise hull modifications and sealing to prevent leaks in some hull designs.
Airmar Boat Thru Hull Transducer 31-338-1-01 | P19 Depth 200 kHz
Airmar’s 31-338-1-01 P19 depth transducer operates at 200 kHz with a 350 W rating, offering a durable 4″ length and a 2″ cutout. Best for boats needing a higher-wattage solution with reliable 200 kHz performance. Good for anglers and sport boats; max thru-hull thickness up to 3″. Note: installation requires a 2″ cutout and compatible cable length up to 30 feet.
Raymarine A22154 DST800 Nylon Thru Hull Transducer
The Raymarine A22154 DST800 offers depth, temperature, and speed in a thru-hull nylon transducer. It is suitable for boats requiring a compact, integrated sensor package with multiple reading capabilities. Best for: cruisers and fishing boats that want essential navigation data in one sensor. Caution: ensure your hull has a compatible mounting surface for the DST800’s shape and mounting method.
Garmin Transducer GT8Hw-Ih
The Garmin GT8Hw-Ih is designed for fiberglass hulls where a transducer inside the hull reduces cavitation issues. It supports high-speed operation and includes CHIRP sonar benefits. Best for bass boats and fast-moving vessels seeking reliable depth without external transducer exposure. Limitation: best installed on hulls with flat sections; not ideal for all hull shapes.
Buying Guide
What should I consider before buying a thru-hull depth transducer?
- Hull material and thickness: Some transducers tolerate thicker hulls or bronze housings; verify max thickness and required cutout.
- Frequency and power: Higher kHz (200 kHz) gives better shallow water detail; power rating affects signal strength at depth.
- Temperature sensing: If you want water and air temperature readings, choose models with integrated sensors.
- Installation complexity: Through-hull installs require drilling; consider professional help for certain hulls and sealing.
- Compatibility: Ensure your display and NMEA wiring can connect to the transducer’s plug type or seek adapters.
FAQ
- Q1: Do thru-hull transducers require drilling in the hull? A1: Yes, most require a hole of around 2 inches, plus proper sealing.
- Q2: Which frequency is best for depth accuracy at various depths? A2: 200 kHz provides good detail at shallower depths; 50/200 kHz options cover broader ranges for deeper water.
- Q3: Can I install a thru-hull transducer myself? A3: It’s possible, but professional installation is recommended for hull integrity and proper sealing.
- Q4: Do temperature sensors affect depth accuracy? A4: Temperature sensors provide air and water data but do not affect depth measurements directly.
- Q5: Will a bronze transducer last in saltwater? A5: Bronze is durable in saltwater environments with proper maintenance and sealing.
- Q6: Can I mix transducers from different brands? A6: Mixing is possible but verify compatibility with your display, power, and data protocol.