The 15 to 20 HP range is one of the most practical buying decisions in boating. These motors have enough power to plane a wide range of aluminum fishing boats, jon boats, and inflatables. They are light enough to tilt by hand and priced where the investment makes sense for a secondary motor or a boat that does not need more power than this.
The most important thing to get right is not which brand you choose. It is matching the motor to your hull. Operating significantly below rated HP on a planing hull means the motor runs near wide-open throttle constantly, which causes accelerated wear and poor fuel economy. If your hull is rated for 20 HP, do not put a 15 HP motor on it and expect it to run efficiently with any real load aboard.
The Top Picks
Yamaha F15
Price range: $2,200 to $2,600
The motor we most often recommend when a customer does not have a specific constraint. Yamaha reliability at this size class is well-proven, parts are widely available, and the long-term ownership cost is predictable. If you are not sure what to buy, the F15 is the safe choice.
Best for: buyers who want a proven motor with no surprises.
Mercury 15 FourStroke
Price range: $2,100 to $2,500
The Mercury four-stroke at this displacement handles cold-season starts better than most in the class, relevant for early spring and late fall use in New England. Solid reliability record and good dealer coverage.
Best for: boaters who use the motor in cold weather or want the Mercury service network.
Honda BF15
Price range: $2,300 to $2,700
Honda builds the BF15 for long service life. The motor is smooth, quiet, and well-engineered. Higher upfront cost than Yamaha or Mercury, with a smaller dealer network, but Honda owners report strong durability over time.
Best for: owners who want maximum long-term reliability and do not mind a premium upfront.
Tohatsu 15 HP
Price range: $1,900 to $2,300
The best value in this class. The Tohatsu 15 HP delivers reliable four-stroke performance at a price point that is $300 to $400 less than comparable Yamaha and Mercury options. As a Tohatsu dealer, we rig and service these regularly; the reliability matches the value.
Best for: buyers who want a quality four-stroke at the lowest cost of entry in this HP range.
Suzuki DF15A
Price range: $2,100 to $2,500
The Suzuki DF15A delivers the lowest fuel consumption per hour at cruise RPMs in this class. The lean-burn system actively adjusts mixture based on operating conditions.
Best for: boaters who cover distance at moderate speeds and prioritize fuel economy.
Mercury 20 HP EFI
Price range: $2,600 to $3,000
If your boat is near the upper end of the 15 HP range in terms of load and hull weight, the 20 HP gives you room to cruise at efficient RPMs instead of working the 15 hard. Electronic fuel injection improves cold-start performance and fuel delivery consistency.
Best for: heavier hulls or boaters who want the step up in power without going to the 25 HP class.
Features Worth Considering at This Power Level
Electric start becomes practical at 15 HP and above. Pull-start is fine on a smaller motor; at 15 HP and up, electric start is worth having.
Power trim lets you adjust the motor angle while underway, optimizing trim for load and conditions. Noticeably useful on a motor you will use regularly.
EFI systems improve cold-start reliability and fuel delivery precision compared to carburetor-based motors, relevant for New England conditions from April through November.
Shaft Length
Measure your transom height before ordering:
- Short shaft (15 inches): most aluminum fishing boats and small jon boats
- Long shaft (20 inches): most fiberglass hulls and deeper transoms
- Extra-long shaft (25 inches): select deep-V and pontoon applications
Wrong shaft length causes ventilation and cavitation problems. Measure before ordering.
Frequently Asked Questions
Which motor is right for my boat?
Tell us your hull, typical load, and how you use it and we will recommend the right motor and HP. Do not size by price; size by what the hull actually needs.
What does annual service cost in this range?
$175 to $300 depending on motor size and what is due. Impeller replacement every two years adds to that.
Tohatsu vs. Yamaha, what is the real difference?
For most recreational boaters, both deliver equivalent reliability. Yamaha has a larger dealer network nationally. Tohatsu costs $300 to $400 less for comparable specifications. We sell and service both; the choice usually comes down to budget and brand preference.