Mermaid M3 3500 BTU 120V Cool Only Marine A/C Unit

Mermaid M3 3500 BTU 120V Cool Only Marine A/C Unit

The Mermaid M3 offers 3,500 BTU cool-only output from 120V power for dedicated cooling aboard compact marine cabins.

3,500 BTU output addresses small spaces.
120V supply suits listed installations.
Cool-only operation excludes heating functions.
Dedicated cooling serves onboard cabins.
Compact format fits limited interiors.

$1,560.00

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SKU: M3CO110 Category: Marine Air Conditioners Brand: Mermaid Marine Air

SKU:

M3CO110

Description

Some boat owners want heat that doesn’t depend on the compressor at all, and the Mermaid M6 Cool & Electric Heat in 110V trim covers that case — 6,500 BTU of standard cooling, plus an electric 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 M6 Electric Heat (110V)

Electric heat strip operates without engaging the compressor or seawater pump
Heat function works even when the boat is out of the water, since it doesn’t rely on seawater circulation
Compact 4″ ducting matches the footprint of Mermaid’s other M6 configurations
Soft start and variable speed blower reduce power draw during startup
Available in right, left, or top air discharge configurations

Mermaid M6 Technical Specifications (110V, Electric Heat)

Model: M6 (Cool & Electric Heat)
Cooling Capacity: 6,500 BTU
Voltage: 110V
Running Amperage (Cool Mode): 6.4 A
Electric Heat Draw: 17.5 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 11.5″
Warranty: 5 years against material defects and workmanship

Why Choose the Mermaid M6 Electric Heat

Electric heat mode pulls significantly more current than the unit’s cooling mode — 17.5A versus 6.4A — which matters on boats with limited generator or shore power capacity. Confirm your electrical panel can handle that draw before choosing this configuration over reverse cycle, which typically runs more efficiently but can’t operate independent of the compressor and seawater system.

For boats that already have reliable water flow and want a more energy-efficient heating option, the Reverse Cycle version of the M6 is generally the better fit — electric heat trades some efficiency for the ability to run without refrigeration engaged.

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 M6 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 Conditioning
Full Model SKU/Code	M-3-C / M3-120V (Micro Cool Only Class)
Country of Origin	USA
AC System Type	Self-Contained Direct-Expansion (DX) Marine AC
Cooling Capacity	3,500 BTU/h (1.0 kW)
Refrigerant Type	R-410A Pre-Charged Environmentally Graded Gas
Compressor Technology	Ultra-Compact Hermetic Rotary Compressor Assembly
Operating Voltage / Frequency	110-120 Volts AC / 60 Hz Single Phase Matrix Line
Full Load Amps / Running Current	Cooling Duty: 3.2 Amps at 115V Operational Duty Cycle
Locked Rotor Amps / Starting Current	11.0 Amps LRA Micro-Grid Start Draw
Recommended Circuit Breaker Rating	10 Amps Heavy-Duty Marine Breaker
Required Sea Water Flow Rate	150 GPH / 9.5 Liters per minute minimum loop
Sea Water Inlet/Outlet Size	5/8" (16mm) Outer Diameter Hose Barb Connections
Duct Display / Air Discharge Size	3.0" (76mm) Low-Profile Air Discharge Collar
Condenser Coil Material	Corrosion-Resistant Cupronickel (CuNi 90/10) Coaxial Heat Exchanger Tube
Control Interface Connectivity	Digital Multi-Speed Thermostat or Single Analog Switch Harness
Dimensions (L x W x H)	33.0 cm x 26.7 cm x 26.7 cm / 13.0" x 10.5" x 10.5"
Dry Weight	14.5 kg / 32.0 lbs (Industry Leading Lightweight Footprint)
Application	Micro climate control zones for pocket cruisers, small boat sleeping v-berths, day-cruiser cuddy pockets, and premium marine trailer configurations (14-24 ft boat lengths)