Flagship FM18RLP – 18,000 BTU Marine Air Conditioner 115V Cool & Heat Low Profile
The Flagship FM18RLP provides 18,000 BTU cool-and-heat operation from 115V power in a low-profile marine climate unit.
- 18,000 BTU output handles substantial cooling.
- 115V supply suits compatible vessels.
- Heating function extends seasonal usability.
- Low-profile housing fits restricted spaces.
- Dual-mode operation shares equipment.
$2,265.25
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Not every boat has 230V power available, and the Flagship FM18RLP in 115V trim brings the same 18,000 BTU, 11-inch-tall low-profile design to boats running standard US shore power — cooling and heating from a single unit built for catamarans and other vessels with limited installation height.
Why Choose the Flagship FM18RLP (115V)
This is the standard-voltage option for most domestic US boats, avoiding the need to step up to 230V shore power just for this unit. The current draw is notably higher than the 230V version — 12.9A versus 6.4A cooling — which is expected given the voltage difference, but it’s worth confirming your panel and breaker can comfortably handle that load, especially with the heating function’s 18.1A draw.
Given the low-profile 11-inch height, this unit is really built for a specific installation constraint — catamarans, shallow bilges, under-berth mounting. If height clearance isn’t an issue on your boat, Flagship’s standard-height FM16 or FM18 models may offer more straightforward serviceability.
What to Know Before Installing
- Confirm your electrical panel supports the 18.1A heating draw, the highest current requirement on this unit
- Made-to-order with a 5-6 day typical lead time
- Ships via LTL freight to a commercial address — residential delivery is not standard
- An optional install kit is available separately
Product Specifications
Product Specifications
| Brand | Flagship Marine |
|---|---|
| Exact Model Code / SKU | FM18RLP (115V 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 | 115V |
| Alternating Current Frequency | 60 Hz |
| Electrical Phase | Single Phase |
| Full Load Amps - FLA Cooling | 13.8 A |
| Full Load Amps - FLA Heating | 16.5 A (Electric Heat Peak Load) |
| Locked Rotor Amps - LRA | 63 A |
| Max Circuit Breaker Size | 35 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 | Low-profile configuration engineered for tight overhead spaces or under-bunk installations in mid-to-large cabins up to 1,000 cu.ft, min generator 4.5 kW. |
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