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Mermaid M6 – Cool Only Marine A/C Unit 6,500 BTU’s 220V
Mermaid M6 provides 6,500 BTU cool-only operation with 220V power for onboard areas requiring dedicated marine air conditioning.
- 6,500 BTU capacity supports compact spaces.
- 220V input suits compatible vessel systems.
- Cool-only design does not heat.
- Marine unit focuses on cabin cooling.
- Voltage requirement affects installation planning.
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Description
The Mermaid M6 Cool & Reverse Cycle in 230V trim brings 6,500 BTU of cooling and heating to smaller cabins — cruisers up to 27 feet or sailboats up to 30 feet — using the same compact stainless steel platform as Mermaid’s other single-zone units. It’s built for spaces where a full-size 9,000 or 12,000 BTU system would be overkill.
Key Features of the Mermaid M6 (230V, Reverse Cycle)
- Reverse cycle heating produces 10-15% more BTU output in heat mode than the unit’s rated cooling capacity
- Compact footprint uses 4″ ducting, smaller than the 6″/4″ combination on larger Mermaid models
- Soft start technology and variable speed blower reduce startup strain and improve comfort control
- Available in right, left, or top air discharge configurations
- Runs off a Honda EU1000i 1,000-watt portable generator in cool mode
Mermaid M6 Technical Specifications (230V, Reverse Cycle)
- Model: M6 (Cool & Reverse Cycle)
- Cooling Capacity: 6,500 BTU
- Voltage: 230V
- Running Amperage: 7.5 A
- Cooling Capacity (Volume): 550 cubic feet
- Recommended Boat Size: up to 27′ cruiser or 30′ sailboat
- Unit Dimensions (L x W x H): 16″ x 11.5″ x 12″
- Ducting: 4″, minimum two 4″ round supply grilles recommended
- Warranty: 5 years against material defects and workmanship
Why Choose the Mermaid M6 Reverse Cycle
One unit doing both cooling and heating simplifies wiring and cuts down the number of onboard systems to maintain, compared to pairing a cool-only AC with a separate heat source. Boats that only need cooling year-round might find the M6 Cool Only configuration a slightly simpler, marginally less complex option instead.
An alternative anchoring setup exists for this unit too — a Statpower 1,000-watt inverter paired with 450 amp-hours of battery can typically run it off-grid for about one night, useful for boats without shore power or a generator running constantly.
What to Know Before Installing
- Pump is not included and must be sourced separately
- 4″ ducting with at least two 4″ round supply grilles is the minimum Mermaid recommends
- Air discharge position (right, left, or top) must be selected before ordering
- Installation guide and M6-series spec sheet are available as downloads from the manufacturer
| Brand | Mermaid Marine Air |
| Exact Model Code / SKU | M6 (220V Cool Only Variant) |
| Country of Origin | USA |
| System Architecture | Self-Contained Marine A/C System |
| Cooling Capacity - BTU/h | 6,500 BTU/h |
| Cooling Capacity - kW/Watts | 1.90 kW |
| Heating Capacity - BTU/h | 0 (Cool Only Model - No Heat Cycle) |
| Reverse Cycle Heating Function | No |
| Electrical Voltage | 220V |
| Alternating Current Frequency | 50/60 Hz |
| Electrical Phase | Single Phase |
| Full Load Amps - FLA Cooling | 2.9 A |
| Locked Rotor Amps - LRA | 12 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 | 250 CFM |
| Duct Discharge Connection Diameter | 4 inches (102 mm) |
| Condensate Drain Connection Size | 1/2 inch (12.7 mm) |
| Physical Dimensions - Unit | 11.5 x 14.0 x 11.5 inches (292 x 356 x 292 mm) |
| Net Weight | 44 lbs (20.0 kg) |
| Chassis & Condenser Material | Stainless Steel Pan & Cupronickel Condenser Loop |
| Standard Factory Warranty | 5 Years |
| Application & Sizing Guidance | International 220V cooling module optimized for low-amperage draws in small cabin envelopes up to 250 cu.ft, min generator footprint 1.5 kW. |
What's in the Box
- 1x Mermaid M6 6,500 BTU Self-Contained Marine Air Conditioner Unit (220V - 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 M6 Cool Only 220V FAQ
How much cooling does this unit provide?
Mermaid M6 provides a total of 6,500 BTU cooling. This dedicated cool-only variant removes the added mechanics of heating assemblies, offering an streamlined tropical environment control option that decreases internal relative humidity settings rapidly during intense summer mid-day heatwaves out on open ocean channels.
What is the weight of this unit?
Mermaid M6 features an exact weight of 47 lbs. Bypassing internal heating elements lowers its net structural footprint, making it an excellent lightweight choice for racing sailboats and micro-cruisers where saving space and eliminating dead weight above the waterline is vital for performance.
Where is Mermaid M6 applied onboard?
Mermaid M6 is ideal for small localized crew quarters. It provides focused cooling comfort on motor yachts or sailboats under twenty-eight feet, dropping effortlessly into open storage lockers beneath companionway steps where structural equipment noise is easily managed using acoustic marine insulation panels.
| Product Metric | Official Value |
|---|---|
| Voltage Circuit | 220V 50Hz |
| Amps Cooling | 2.5 Amps |
| Blower Style | Rotatable Centrifugal |
| Duct Rings | 4 inches |
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