Mermaid M6 – Cool Only Marine A/C Unit 6,500 BTU’s 220V

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.

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