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Flagship FM18RLP – 18,000 BTU Marine Air Conditioner 230V Cool & Heat Low Profile
Flagship FM18RLP delivers 18,000 BTU cooling and heating through 230V power in a low-profile marine air conditioner.
- 18,000 BTU capacity supports larger cabins.
- 230V input matches listed systems.
- Cool and heat provide dual-mode operation.
- Low-profile design reduces installation height.
- Marine conditioner manages cabin climate.
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Description
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.
Key Features of the Flagship FM18RLP (230V, Cool & Heat)
- No PC board design — simpler electronics with fewer failure points than circuit-board-controlled units
- LG rotary compressor runs quietly enough that some owners mount the unit directly under a berth
- Soft start capacitors and a stratified startup sequence reduce compressor strain during startup
- Dry drain pan design means the rotary compressor doesn’t sit in its own condensate
- Choose top or side air discharge to match your installation layout
- Includes a 4-wire battery-operated thermostat standard
Flagship FM18RLP Technical Specifications (230V, Cool & Heat)
- Cooling Capacity: 18,000 BTU
- Voltage: 230V
- Refrigerant: R410a
- Amps Cooling: 6.4 A
- Amps Heating: 9.0 A
- Electric Heat Output: 2.0 kW
- Blower Airflow: 555 CFM
- Dimensions (L x W x H): 24″ x 17″ x 10.5″
- Net Weight: 113 lbs (52 kg)
- Warranty: 5 years parts / 1 year labor (condenser, chassis, compressor, evaporator)
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
| Brand | Flagship Marine |
| Exact Model Code / SKU | FM18RLP (230V Cool & Heat) |
| Country of Origin | USA |
| System Architecture | Self-Contained Low-Profile Marine A/C System |
| Cooling Capacity - BTU/h | 18,000 BTU/h |
| Cooling Capacity - kW/Watts | 5.27 kW |
| Heating Capacity - BTU/h | 18,000 BTU/h |
| Reverse Cycle Heating Function | Yes |
| Electrical Voltage | 230V |
| Alternating Current Frequency | 50/60 Hz |
| Electrical Phase | Single Phase |
| Full Load Amps - FLA Cooling | 6.9 A |
| Full Load Amps - FLA Heating | 8.3 A |
| Locked Rotor Amps - LRA | 32 A |
| Max Circuit Breaker Size | 20 A |
| Refrigerant Type | R-410A |
| Compressor Type | Hermetic Rotary |
| Seawater Water Flow Rate | 4.16 GPM (250 GPH) |
| Seawater Inlet Pipe Size | 5/8 inch (16 mm) |
| Seawater Outlet Pipe Size | 5/8 inch (16 mm) |
| Evaporator Airflow Capacity | 550 CFM |
| Duct Discharge Connection Diameter | 6 inches (152 mm) |
| Condensate Drain Connection Size | 1/2 inch (12.7 mm) |
| Physical Dimensions - Unit | 12.0 x 21.0 x 15.0 inches (305 x 533 x 381 mm) |
| Net Weight | 74 lbs (33.6 kg) |
| Chassis & Condenser Material | Stainless Steel Frame & Cupronickel Condenser Coil |
| Standard Factory Warranty | 5 Years (Limited) |
| Application & Sizing Guidance | 230V low-profile variant configured for international shore infrastructure or 50/60Hz vessels; maximizes vertical space clearance in cabins up to 1,000 cu.ft, min generator 4.5 kW. |
What's in the Box
- 1x Flagship FM18RLP 18,000 BTU Low-Profile Self-Contained Marine Air Conditioner Unit (230V - Cool & Heat)
- 1x Multi-Stage Reverse Cycle Heat Pump Assembly
- 1x Heavy-Duty 100% Cupronickel Seawater Condenser Coil
- 1x High-Velocity Rotatable Low-Profile Blower Assembly
- 1x Deep-Draw Marine-Grade Stainless Steel Drain Pan
- 1x Washable Aluminum Mesh Return Air Filter
- 1x User Manual and Installation Guide
Flagship FM18RLP 230V AC FAQ
What are the electrical requirements for FM18RLP?
Flagship FM18RLP operates safely on a 230V power connection. This heavy-duty single-phase configuration draws low operational current during active reverse-cycle heating cycles, allowing larger powerboats to distribute climate loads smoothly over international shore lines or standard diesel generator panels without throwing main distribution breakers.
What airflow volume does this system deliver?
Flagship FM18RLP generates an airflow volume of 500 CFM. The integrated dual-stage low-profile centrifugal blower fan sweeps air evenly across expansive saloon areas, matching multi-cabin duct setups while running quietly against structural marine plywood bulkheads to keep interior sound footprints minimized.
Which vessels fit the Flagship FM18RLP?
Flagship FM18RLP is designed for custom motor yachts and deep-V express cruisers. Its flat, low-clearance chassis architecture fits perfectly into tight ceiling pockets or under shallow cockpit benches on vessels from thirty-eight to forty-eight feet, incorporating standard 100 percent cupronickel condenser plumbing loops for premium durability.
| Chassis Attribute | Factory Value |
|---|---|
| Thermal Output | 18,000 BTU |
| Net Weight | 72 lbs |
| Chassis Height | 11.5 inches |
| Duct Ring | 6 inches |
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