Flagship FM18RLP – 18,000 BTU Marine Air Conditioner 230V Cool & Heat Low Profile

Catamarans and boats with tight overhead clearance rarely have room for a standard-height AC unit, and Flagship built the FM18RLP specifically around that constraint — just 11 inches tall, delivering 18,000 BTU of both cooling and heating on 230V power without the printed circuit board that tends to be the first thing to fail on other units.

Why Choose the Flagship FM18RLP

At 11 inches tall, this unit fits into low-clearance spaces that would rule out most 16,000+ BTU systems entirely — the trade-off is a made-to-order build with a longer lead time (typically 5-6 days) rather than something that ships same-day off a shelf. Flagship has built these in Stuart, Florida since 1995, and the no-PC-board design is a deliberate choice to reduce the kind of electronic failures that plague more complex control systems.

This 230V configuration draws less current than the equivalent 115V version for the same output — worth factoring in if your boat’s 230V circuit capacity is limited compared to what a 115V setup would need.

What to Know Before Installing

• Units are made-to-order with a typical 5-6 day lead time before shipping
• Ships via LTL freight on a semi-tractor trailer to a commercial address only — residential delivery is not standard
• An optional install kit is available separately for a complete setup
• Confirm whether top or side discharge better fits your installation before ordering, since this is a build-to-order selection