Hern Marine
7341 Dixie Highway (Rt. 4),
Fairfield Ohio, 45014
Tel:(513) 874-2628
Supreme S21 - main image

2018 Supreme S21

Year 2018
Length 20'11 ft

Designed with the professional in mind, it’s priced for the weekend warrior. The S21 first introduced Supreme’s QuickFill ballast system, which is a 750-pound capacity ballast tooled into the hull that fills with water in two minutes. In other words, it’s ready when you are to chase those goals. Optional Plug and Play ballast in the back is available to elevate your wake riding. It has room for 12, with safety and spacious seating prioritized.


Year Built 2018
Category Power
Length Overall 20'11 ft
Beam 8'6 ft
Max Draft 2'6 ft
Number of Passengers 12
Construction Fiberglass
Engines 1
Fuel Tanks 1
Fuel Tank Cap. 45 gal
Dry Weight 4,200 lb

Engine 1 Specifications

Make: PCM
Engine Power: 340hp
Type: Inboard
Standard Features
  • Custom designed interiors with top of the line marine vinyl and foam
  • Massive amounts of storage
  • Custom Vinyl Wrapped with Full Instrumentation
  • 40 oz Marine Carpet
  • Digital Speed Control
  • Depth Finder
  • Air – Water Temperature Display
  • Supreme Altitude Control System
  • Pro S4 Tower System (White or Black)
  • Swivel Flip up Bolster Driver’s Seat
  • Dual Fuel Fills
  • Stainless Cup Holders
  • Quickfill Ballast 1000lbs hull-flooding
  • Clarion Bluetooth Stereo
  • Snap-In 40oz Marine Carpet
  • Wake Plate.