Mermaid M12 – Cool & Reverse Cycle Marine A/C Unit 12,000 BTU’s 230V

For boats in the 32 to 34-foot range that want the option of onboard heating alongside cooling, the Mermaid M12 Cool and Reverse Cycle delivers 12,000 BTU of both from a compact, hand-built unit — sized specifically for cruisers up to 32 feet or sailboats up to 34 feet.

Why Choose the Mermaid M12 Reverse Cycle

One unit handling both cooling and heating simplifies wiring and reduces the number of onboard systems to maintain, compared to pairing a cool-only AC with a separate heat source. An alternative anchoring setup exists too — a Statpower 1,800-watt pure sine wave inverter with 450 amp-hours of battery can typically run this unit off-grid for about one night.

Before ordering, it’s worth confirming the exact voltage specification directly with Mermaid given the inconsistency noted above between this listing’s title and its published spec table — an easy phone or email confirmation that avoids any mismatch with your boat’s electrical system.

What to Know Before Installing

• Confirm exact voltage and amperage specifications directly with Mermaid or a dealer before finalizing your electrical plan, due to a data inconsistency in the published spec sheet for this listing
• 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 must be selected before ordering