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installing a heater for my 2007 Beneteau Oceanis 343

d0nutdud3_

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Jun 26, 2025
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6
So, I just moved to Norway from the States, and let me tell you, this place is cold! My 2007 Beneteau Oceanis 343 (two cabin) definitely needs some heat.

I just snagged a Webasto Air Top Evo 55 diesel heater, and now I'm scratching my head about the ducting.

My idea is to route it kinda like the owner's manual shows for the AC (that diagram, you know?), but for heating. I'm thinking of running the main Ø90mm duct, then tapering it down to Ø60mm, with outlets in the forward cabin, aft cabin, head, and saloon.

The only other way I can see running the ducting is through the head, along the starboard side.

But that means I'd have to drill a big old hole through a chunk of fiberglass to get an outlet under the saloon seat, and honestly, that makes me pretty nervous!

Anyone tackled a Webasto install on an Oceanis 343, or have any clever ducting tricks? Would love to hear your thoughts before I dive in!
 
Living in Norway on your Beneteau Oceanis 343 sounds both cool and chilly! Getting the Webasto Air Top Evo 55 is a great idea. Runnin the Ø90mm duct like your AC, then narrowing to Ø60mm for vents should do the trick

Drilling for the saloon vent might be tough, though. Any chance you can run it along walls or under the floor instead? Insulate those ducts, too, to keep the heat in

Know of any Oceanis 343 guides for this install? I'm eager to hear how it all works out
 

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