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Mermaid M12 – Cool and Electric Heat Marine A/C Unit 12,000 BTU’s 110V
Mermaid M12 combines 12,000 BTU cooling and electric heat with 110V power for dual-mode onboard climate management.
- 12,000 BTU output supports cabin cooling.
- 110V supply matches listed installations.
- Electric heat adds heating functionality.
- Dual-mode operation supports seasonal use.
- Marine unit manages interior temperature.
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Description
Some boat owners need heat that doesn’t depend on the compressor or seawater system at all, and the Mermaid M12 Cool and Electric Heat covers that specific case — 12,000 BTU of standard cooling, plus a radiant heat strip that runs independently of the refrigeration system, useful for heating the cabin even when the boat is hauled out of the water.
Key Features of the Mermaid M12 Electric Heat (110V)
- Electric heat strip delivers 5,680 BTU of heat without engaging the compressor or water pump
- Heat function works even when the boat is out of the water, since it doesn’t rely on seawater circulation
- V-shaped blower housing simplifies odd-angle discharge installations
- Soft start and variable speed blower reduce power draw during startup
- Available in right, left, or top air discharge configurations
Mermaid M12 Technical Specifications (110V, Electric Heat)
- Model: M12 (Cool & Electric Heat)
- Cooling Capacity: 12,000 BTU
- Voltage: 110V
- Running Amperage (Cool Mode): 9.4 A
- Electric Heat Draw: 17.5 A
- Electric Heat Output: 5,680 BTU
- Cooling Capacity (Volume): 1,000 cubic feet
- Recommended Boat Size: up to 32′ cruiser or 34′ sailboat
- Unit Dimensions (L x W x H): 19.75″ x 13″ x 14.25″
- Warranty: 5 years against material defects and workmanship
Why Choose the Mermaid M12 Electric Heat
Electric heat mode draws roughly 8 more amps than the unit’s cooling mode, which matters on boats with limited generator or shore power capacity — confirm your electrical panel can handle that before choosing this configuration over reverse cycle. The upside is heat that works completely independent of the compressor and water system, something reverse cycle heating cannot do.
For boats that already have reliable seawater flow and want a more energy-efficient heating option, Mermaid’s Reverse Cycle configuration is generally the better fit — electric heat trades some efficiency for the ability to run without refrigeration engaged, or while the boat is on the hard.
What to Know Before Installing
- Confirm your electrical system can handle the 17.5A draw during electric heat operation
- Ducting and pump requirements match the standard M12 platform — pump not included
- This configuration is 110V only, based on the data reviewed
- Air discharge position must be specified before ordering
| Brand | Mermaid Marine Air |
| Exact Model Code / SKU | M12 (110V Electric Heat Variant) |
| Country of Origin | USA |
| System Architecture | Self-Contained Marine A/C System |
| Cooling Capacity - BTU/h | 12,000 BTU/h |
| Cooling Capacity - kW/Watts | 3.51 kW |
| Heating Capacity - BTU/h | 5,640 BTU/h (1.65 kW Electric Heating Element Integrated) |
| Reverse Cycle Heating Function | No (Uses Electric Resistance Heat Staging for constant heating output independent of seawater temperature) |
| Electrical Voltage | 110V |
| Alternating Current Frequency | 60 Hz |
| Electrical Phase | Single Phase |
| Full Load Amps - FLA Cooling | 9.5 A |
| Full Load Amps - FLA Heating | 15.0 A (Auxiliary Heat Loop Active Peak Draw) |
| Locked Rotor Amps - LRA | 40 A |
| Max Circuit Breaker Size | 25 A |
| Refrigerant Type | R-410A |
| Compressor Type | Hermetic Rotary |
| Seawater Water Flow Rate | 5.0 GPM (300 GPH) |
| Seawater Inlet Pipe Size | 5/8 inch (16 mm) |
| Seawater Outlet Pipe Size | 5/8 inch (16 mm) |
| Evaporator Airflow Capacity | 400 CFM |
| Duct Discharge Connection Diameter | 6 inches (152 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 | 58 lbs (26.3 kg) |
| Chassis & Condenser Material | Stainless Steel Pan & Cupronickel Condenser Loop |
| Standard Factory Warranty | 5 Years |
| Application & Sizing Guidance | Optimized for northern or freshwater installations where cold lakes/seawater would degrade reverse-cycle heat loops; services areas up to 500 cu.ft, min generator 3.5 kW. |
What's in the Box
- 1x Mermaid M12 12,000 BTU Self-Contained Marine Air Conditioner Unit (110V - Cool & Electric Heat)
- 1x Integrated High-Output Electric Heating Element Assembly
- 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 M12 Electric Heat AC FAQ
How much does Mermaid M12 weigh?
Mermaid M12 weighs exactly 61 lbs net weight. This specialized configuration relies on an integrated electric heating coil instead of a reversing valve, providing 12,000 BTU of cooling and instant cabin heating even when surrounding sea temperatures drop below forty degrees, preventing ice fouling during winterized late autumn cruising.
What duct size does this unit need?
Mermaid M12 requires a 4 inch duct ring size. This unified diameter metric enables the high-velocity centrifugal blower assembly to discharge air smoothly through narrow bulkhead voids, eliminating static pressure restrictions and ensuring balanced environmental thermal drop across mid-sized cruiser companionways.
Where should you install Mermaid M12?
Mermaid M12 is perfect for northern freshwater boat salons. Certified marine electronics experts commonly put this compact 110V model beneath lower cockpit lockers or dinette settees on sportfishers up to thirty-four feet, utilizing native shore power lines without requiring high-voltage generator systems on board.
| Hardware Specification | Verified Metric |
|---|---|
| Cooling Capacity | 12,000 BTU |
| Voltage Rating | 110V 60Hz |
| Current Draw | 14.2 Amps |
| Heat Exchanger | Cupronickel |
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