Mermaid M9 – Cool Only Marine A/C Unit 9,000 BTU’s 230V

For boats with 230V power and no need for reverse cycle heating, the Mermaid M9 Cool Only strips the unit down to its core function — 9,000 BTU of cooling for roughly 800 cubic feet of cabin space, sized for cruisers up to 30 feet or sailboats up to 32 feet, without the added mechanical complexity of a reversing valve.

Why Choose the Mermaid M9 Cool Only

Skipping the reverse cycle mechanism means fewer moving parts and one less system that can eventually need service, which appeals to owners in consistently warm climates who have no real use for onboard heating. If your cruising plans ever extend into cooler weather, the Reverse Cycle or Electric Heat versions of the M9 cover that need instead, at a similar footprint and price point.

At 7.0A running amperage on 230V, this is a lighter electrical draw than the 110V Cool Only variant, which pulls more current to deliver the same cooling output — worth factoring in if your boat’s 230V circuit capacity is limited.

What to Know Before Installing

• Pump is not included and must be sourced separately
• Ducting requires both 6″ and 4″ runs, with at least three 4″ round supply grilles
• Air discharge position must be selected before ordering
• Since this model has no heating function, confirm it fits your climate needs before purchase — there’s no upgrade path without swapping the full unit