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

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.

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