Yamaha HARMO Outboards
Yamaha HARMO Outboards represent Yamaha’s significant stride into the electric marine propulsion market. It’s not just an electric motor; it’s a next-generation integrated boat control system platform. This system aims to offer a quieter, more enjoyable, and environmentally conscious boating experience.

First launched in Europe in spring 2022, Yamaha continues to evolve HARMO. They have introduced the HARMO 2.0 version. Furthermore, they are expanding its availability to markets like Japan (June 2025) and the U.S. (early 2025).

Revolutionary Features of Yamaha HARMO
HARMO is a completely electric system. It targets zero emissions and silent operation on the water. This makes it ideal for ecologically sensitive areas or quiet lakes. Moreover, it suits boaters seeking a more serene experience.

Rim Drive Technology: Efficient and Quiet Propulsion
This is a core innovation of HARMO. Unlike traditional outboards, the propeller is not driven by a shaft from a central motor. Instead, HARMO’s electric motor mounts around the outer edge of the propeller (the “rim”). This design offers several advantages. It ensures higher efficiency in electric propulsion. It also provides increased thrust at low speeds. Consequently, users gain excellent control for docking and navigating confined spaces. This unique mechanism also results in ultra-quiet operation. Therefore, users can fully immerse themselves in nature’s sounds.

Integrated Digital Electric Steering (DES): Precise Control
HARMO features DES integrated directly into the propulsion unit. This eliminates external steering components. Thus, it leads to a cleaner transom. It also provides precise steering and enhanced reliability. The system offers a wide 140-degree total steering angle. This enables impressive maneuverability. For instance, single-engine setups can achieve on-the-spot rotation. Twin setups allow true lateral movement.

Helm Master EX® Integration: Advanced Boat Control
HARMO seamlessly integrates with Yamaha’s advanced Helm Master EX® boat control system. This system provides intuitive joystick control. Joystick control simplifies docking and maneuvering in tight spaces. Thus, it makes boating accessible for all skill levels. Users also gain access to advanced features like SetPoint™ (to hold the boat in a fixed position) and Autopilot™ functionalities. These features significantly enhance convenience for cruising and fishing.

Power and Versatility: Broad Application
A single HARMO unit provides approximately 3.7 kW of power. This translates to a static thrust equivalent of a 9.9 horsepower gasoline-powered outboard. It achieves around 225-227 pounds of static thrust. HARMO is available in both single and twin configurations. This caters to a variety of boat sizes and applications. Users can effectively maneuver boats up to 21 feet with a single unit. Twin units handle boats up to 32 feet in most conditions.

Physical Design and Installation: Practicality and Ease
New HARMO models offer both 20-inch and 25-inch shaft lengths. This ensures compatibility with a broader range of boats. This includes pontoons and various transom heights. Furthermore, HARMO features a conventional mounting bracket. It also includes a low-profile rigging tube, similar to traditional outboards. These design choices simplify installation on diverse transoms. The system also incorporates a tilt function. This allows users to lift the unit clear of the water.

Battery Requirements: Powering Your Electric Journey
HARMO systems require a 48-volt DC power supply. They are compatible with Yamaha-approved traditional 12-volt batteries (connected in series for 48V). Alternatively, users can opt for specifically designed lithium-ion battery solutions for HARMO.

Target Applications: Who Benefits from HARMO?
Yamaha HARMO is particularly suited for:

Boaters seeking a quiet, peaceful experience on the water.
Areas with horsepower or internal combustion engine restrictions.
Tenders, rental boats, and small to medium-sized recreational boats.
Some commercial sightseeing vessels.
Eco-tourism operators who prioritize environmental responsibility.
Current Availability: Global Rollout
The new generation of Yamaha HARMO electric outboards, including HARMO 2.0, has been rolling out globally. It first launched in the European market in late 2024. Releases in Japan are set for June 2025. Expected availability in the U.S. is early 2025. While currently often available as OEM-installed units through boat builders, its increasing market presence suggests wider accessibility.

Yamaha HARMO marks a significant step in sustainable marine propulsion. It combines Yamaha’s renowned engineering with a strong commitment to an eco-conscious future on the water.