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Mermaid M9 – Cool Only Marine A/C Unit 9,000 BTU’s 230V
The Mermaid M9 specifies 9,000 BTU cool-only output with 230V power for marine spaces requiring dedicated air conditioning.
- 9,000 BTU capacity suits smaller spaces.
- 230V input matches listed power systems.
- Cool-only operation excludes heating functions.
- Dedicated cooling serves onboard cabins.
- Voltage requirement guides installation planning.
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Description
For boats with 230V power and no need for reverse cycle heating, the Mermaid M9 Cool Only strips the unit down to its core function — 9,000 BTU of cooling for roughly 800 cubic feet of cabin space, sized for cruisers up to 30 feet or sailboats up to 32 feet, without the added mechanical complexity of a reversing valve.
Key Features of the Mermaid M9 Cool Only (230V)
- Simpler mechanical design than the reverse cycle version, with one less system to maintain
- Shares its compact stainless steel base with the smaller M6 (6,500 BTU) unit
- Soft start technology and variable speed blower reduce startup strain and improve comfort precision
- Available in right, left, or top air discharge configurations
- Resettable 30-amp circuit breaker simplifies field maintenance versus the older glass fuse design
Mermaid M9 Technical Specifications (230V, Cool Only)
- Model: M9 (Cool Only)
- Cooling Capacity: 9,000 BTU
- Voltage: 230V
- Running Amperage: 7.0 A
- Cooling Capacity (Volume): 800 cubic feet
- Recommended Boat Size: up to 30′ cruiser or 32′ sailboat
- Unit Dimensions (L x W x H): 16″ x 11.5″ x 11.5″
- Ducting: 6″ and 4″ combination, minimum three 4″ round supply grilles recommended
- Warranty: 5 years against material defects and workmanship
Why Choose the Mermaid M9 Cool Only
Skipping the reverse cycle mechanism means fewer moving parts and one less system that can eventually need service, which appeals to owners in consistently warm climates who have no real use for onboard heating. If your cruising plans ever extend into cooler weather, the Reverse Cycle or Electric Heat versions of the M9 cover that need instead, at a similar footprint and price point.
At 7.0A running amperage on 230V, this is a lighter electrical draw than the 110V Cool Only variant, which pulls more current to deliver the same cooling output — worth factoring in if your boat’s 230V circuit capacity is limited.
What to Know Before Installing
- Pump is not included and must be sourced separately
- Ducting requires both 6″ and 4″ runs, with at least three 4″ round supply grilles
- Air discharge position must be selected before ordering
- Since this model has no heating function, confirm it fits your climate needs before purchase — there’s no upgrade path without swapping the full unit
| Brand | Mermaid Marine Air |
| Exact Model Code / SKU | M9 (230V Cool Only Variant) |
| Country of Origin | USA |
| System Architecture | Self-Contained Marine A/C System |
| Cooling Capacity - BTU/h | 9,000 BTU/h |
| Cooling Capacity - kW/Watts | 2.64 kW |
| Heating Capacity - BTU/h | 0 (Cool Only Model - No Heat Cycle) |
| Reverse Cycle Heating Function | No |
| Electrical Voltage | 230V |
| Alternating Current Frequency | 50/60 Hz |
| Electrical Phase | Single Phase |
| Full Load Amps - FLA Cooling | 3.6 A |
| Locked Rotor Amps - LRA | 15 A |
| Max Circuit Breaker Size | 15 A |
| Refrigerant Type | R-410A |
| Compressor Type | Hermetic Rotary |
| Seawater Water Flow Rate | 3.33 GPM (200 GPH) |
| Seawater Inlet Pipe Size | 5/8 inch (16 mm) |
| Seawater Outlet Pipe Size | 5/8 inch (16 mm) |
| Evaporator Airflow Capacity | 300 CFM |
| Duct Discharge Connection Diameter | 5 inches (127 mm) |
| Condensate Drain Connection Size | 1/2 inch (12.7 mm) |
| Physical Dimensions - Unit | 11.5 x 16.0 x 12.0 inches (292 x 406 x 305 mm) |
| Net Weight | 49 lbs (22.2 kg) |
| Chassis & Condenser Material | Stainless Steel Pan & Cupronickel Condenser Loop |
| Standard Factory Warranty | 5 Years |
| Application & Sizing Guidance | 230V dedicated tropical cooling layout for international power distribution profiles; ideal for stateroom environments up to 350 cu.ft, min generator footprint 2.0 kW. |
What's in the Box
- 1x Mermaid M9 9,000 BTU Self-Contained Marine Air Conditioner Unit (230V - Cool Only)
- 1x Heavy-Duty Cupronickel Condenser Tube-in-Tube Heat Exchanger
- 1x High-Velocity Centrifugal Blower Assembly
- 1x Marine-Grade Condensate Drain Pan Base Assembly
- 1x Mechanical/Digital Thermostat Interface Terminal Block
- 1x Removable and Washable Composite Air Filter
- 1x Operation Manual and Detailed Installation Guide
Mermaid M9 Cool Only 230V FAQ
How much does Mermaid M9 weigh?
Mermaid M9 weighs exactly 51 lbs total net weight. This streamlined cool-only variation removes heavy internal reversing valves, reducing structural weights on small luxury watercraft while delivering a full 9,000 BTU of heat-reversing air conditioning capacity to combat brutal tropical climates over long open water summer cruises.
What duct size does this unit need?
Mermaid M9 requires a 4 inch duct ring size. This unified diameter metric allows the high-velocity centrifugal blower to exhaust immense cold air volume continuously, bypassing static friction traps inside tight bulkhead voids and providing efficient, uniform interior climate reduction throughout your small boat interior cabins.
Where should you install Mermaid M9?
Mermaid M9 is perfect for small guest staterooms and mid-cabins. Marine electronics experts typically mount this standalone 230 Volt system inside cockpit storage benches or beneath lower salon berths on performance boats up to thirty feet, keeping vital walking companionways clear of machinery obstructions during offshore voyages.
| System Attribute | Factory Value |
|---|---|
| Cooling Capacity | 9,000 BTU |
| Voltage Rating | 230V 60Hz |
| Current Draw | 3.5 Amps |
| Chassis Length | 16.00 inches |
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