Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 boat specs
Harris Flotebote
Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010
2010
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VS
Harris Flotebote Sunliner 240 I/O 2006 boat specs
Harris Flotebote
Harris Flotebote Sunliner 240 I/O 2006
2006
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Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 vs Harris Flotebote Sunliner 240 I/O 2006: Same Brand, Different Boat

The Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 vs Harris Flotebote Sunliner 240 I/O 2006 comparison sits squarely in the category of decisions where specs alone won't tell the whole story: intended use, storage, and long-term ownership costs all factor in.

On paper these two are close siblings in the size department - Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 at 25,0 ft versus Harris Flotebote Sunliner 240 I/O 2006 at 24,0 ft. Weight tells a clearer story for trailering families: the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 tips the scales at 3 200 lbs - 200 lbs more than the Harris Flotebote Sunliner 240 I/O 2006 at 3 000 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.

The power gap is worth calling out. Rated to 300 hp, the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 has a 165-hp advantage over the Harris Flotebote Sunliner 240 I/O 2006's 135-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load.

For family outings this is probably the sharpest distinction between the two. The Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 is rated for 14 passengers, while the Harris Flotebote Sunliner 240 I/O 2006 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 could be the deciding factor.

Bottom line: Choose the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 if your priority is putting more people on the water - it handles 14 passengers and at 25,0 ft it has the deck room to back that rating up comfortably. The Harris Flotebote Sunliner 240 I/O 2006 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 7 that costs less to run day-to-day.
General Boat Info
MakeHarris Flotebote
MakeHarris Flotebote
ModelGrand Mariner SL 250 (3-Tube)
ModelSunliner 240 I/O
Model Year2010
Model Year2006
Measurements / Dimensions
Beam8 ft. 6 in.
Beam8 ft. 6 in.
Beam - Meters2.59
Beam - Meters2.59
Beam - Inches102
Beam - Inches102
Bridge clearance - Detail62 in.
Bridge clearance - Detail62 in. (Bimini/stern light down)
Bridge clearance - Meters1.57
Bridge clearance - Meters1.57
Bridge clearance - Inches62
Bridge clearance - Inches62
Draft [drive up] - Detail13 in.
Draft [drive up] - Detail13 in.
Draft [drive up] meters0.33
Draft [drive up] meters0.33
Draft [drive up] inches13
Draft [drive up] inches13
Draft [max] - Detail21 in.
Draft [max] - Detail22 in.
Draft [max] - Meters0.53
Draft [max] - Meters0.56
Draft [max] - Inches21
Draft [max] - Inches22
Weight - Detail3,200 lbs. with Performance III Package
Weight - Detail3,000 lbs.
Weight - kg1451.49
Weight - kg1360.78
Weight - lbs.3200
Weight - lbs.3000
Length - Feet25
Length - Feet24
Length overall - Detail26 ft. 4 in. Pontoon: 25 ft.
Length overall - Detail24 ft. 0 in.
Length overall - Meters8.03
Length overall - Meters7.32
Length overall - Inches316
Length overall - Inches288
Body / Hull
Hull materialAluminum
Hull materialnot available
Hull typePontoon
Hull typenot available
Pontoon and Inflatable Specific
Tube diameter25 in.
Tube diameter25 in.
Number of tubes3
Number of tubesnot available
Engine and Drivetrain
Fuel typeGas
Fuel typenot available
Drive typeOutboard
Drive typeOutboard
Engine max300 hp
Engine max135 hp w/ Performance-III Package: 135 hp
Operational Info
Maximum capacity1,918 lbs. with Performance III Package
Maximum capacitynot available
Maximum people14 with Performance III Package
Maximum peoplenot available

Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 vs Harris Flotebote Sunliner 240 I/O 2006 - Common Questions

Which is the larger boat - the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 or the Harris Flotebote Sunliner 240 I/O 2006?
The Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 is the longer of the two at 25,0 feet overall. The Harris Flotebote Sunliner 240 I/O 2006 comes in at 24,0 feet, making it roughly 1,0 ft shorter - a meaningful difference in deck room and overall on-water presence.
Which is easier to trailer - the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 or the Harris Flotebote Sunliner 240 I/O 2006?
For trailering, the Harris Flotebote Sunliner 240 I/O 2006 has the edge at 3 000 lbs dry weight versus 3 200 lbs for the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010. Add a motor (typically 300–500 lbs for an outboard in this class), gear, and a partial fuel load and the difference grows. Lighter is friendlier on smaller tow vehicles and on fuel economy while hauling.
Which boat can handle a bigger outboard?
The Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 is rated to a maximum of 300 hp, giving it the larger power ceiling. The Harris Flotebote Sunliner 240 I/O 2006 tops out at 135 hp. Keep in mind that maximum ratings are just that - matching the motor to the actual load and usage pattern usually matters more than chasing the ceiling.
How many people can each boat hold?
The Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 is Coast Guard rated for 14 passengers, while the Harris Flotebote Sunliner 240 I/O 2006 is certified for 7. Note that legal capacity and comfortable capacity aren't always the same thing - on a full day out, most experienced boaters aim for about 80% of the rated number to keep things comfortable.
Do these boats require an oversize trailer permit to tow on US highways?
Both the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 and Harris Flotebote Sunliner 240 I/O 2006 share an 8 ft. 6 in. beam - meaning both sit right at the 8’6" threshold that most US states use for standard-width loads. In most states you can tow at that width without a special permit, but regulations vary. Always check the rules for your state and any states you'll be passing through before your first long haul.
Are the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 and Harris Flotebote Sunliner 240 I/O 2006 from the same manufacturer?
Yes - both the Harris Flotebote Grand Mariner SL 250 (3-Tube) 2010 and the Harris Flotebote Sunliner 240 I/O 2006 are built by Harris Flotebote. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.