You are standing on the aft deck of a fifty-foot catamaran that has thirty feet of beam, and the thing that strikes you is not the width. It is the quiet. No generator. No diesel rattle. Just a boat sitting at anchor running its systems off stored sunlight.
That is the pitch for every Eco model Sunreef builds. What makes the Sunreef 50 Sail NEXT different is that it is the one you might actually run yourself.
Who It's For
The 50 Eco is the entry point to the Sunreef range and the most owner-operable boat the shipyard makes. If you have chartered catamarans, know what you like, and want something built to your brief rather than picked off a production line, this is where that conversation starts without immediately requiring a professional crew.
It suits the owner who wants space more than length. Sunreef publishes 167 m² of living space on a 15.2 m (50 ft) hull, and that number comes from an unusually wide 9.1 m (30 ft) beam. You get the deck area of a much longer boat and the berthing bill of a fifty-footer.
Design and Layout
Nine point one metres of beam on a fifty-foot hull is a lot. On a conventional monohull of this length the saloon is a corridor; here it is a room with sightlines out both sides, and the two hulls carry accommodation without the saloon having to give anything up.
Sunreef does not publish a cabin or head count for the 50, and that is not an omission. Every hull is built to its owner's brief, so the general arrangement is contract documentation rather than a brochure page. Most owners take a full-hull owner's suite on one side with guest cabins opposite; boats intended for charter go symmetrical.
The rig is modest for the length — a 80 m² mainsail with a 79 m² genoa — which is consistent with a boat designed for comfortable cruising rather than performance sailing.
The Eco Package, Honestly
Sunreef offers this hull in a classic version with 2 × 80 hp diesels and an Eco version that replaces them with electric motors, a lithium bank, hydrogeneration from the propellers under sail, and the shipyard's own solar panels.
Those panels are worth understanding. Sunreef designs and manufactures them in Gdansk and laminates them into the composite structure rather than bolting a third-party array to the roof. They are flexible enough to mount on hulls, biminis and masts, which is why Sunreef can scale the array with the boat instead of being limited to flat surfaces.
Here is the honest part. Sunreef does not publish a solar figure for the 50 the way it does for the 100, and physics limits what a fifty-foot boat can carry. Treat the electric drive here as a quiet-harbour and short-hop system backed by tankage, not as the indefinite off-grid promise you get further up the range. If silent anchoring for a week is the entire reason you are buying, look at the 60 or the 70.
The One Model Without a NEXT
Sunreef began rolling out a design generation it calls NEXT across its ranges in 2025 — new superstructures, reworked saloons, better cockpit flow. On the shipyard's own sailing range page the 60, 70, 80 and 100 all carry the NEXT suffix. The 50 does not.
That is worth knowing rather than worrying about. It means the 50 is the current drawing of a proven hull rather than a restyled one, and if you are comparing brokerage boats you are not looking at two visually different generations the way you might be on the 80.
What Sunreef Does Not Tell You
Sunreef publishes no speed figure for any boat in its current range. No top speed, no cruise speed, no range — not on this model and not on any of the other thirteen we cover. That is unusual. Most yards at this level publish at least a cruise figure, and several publish full performance tables.
We have left those rows empty on the specification table rather than filling them with an estimate. If a broker or a listing hands you a precise Sunreef speed, ask where it came from, because it did not come from the shipyard.
The same applies to displacement, which Sunreef publishes for nothing in the range, and to draft, which it publishes for only three of the fourteen models. Get the numbers you need in writing before you sign a build contract. Sunreef will provide them — they simply are not on the website.
Where to Start
The Sunreef 50 Sail NEXT is the most usable boat in the range. Buy it for the space, the bespoke build and the realistic prospect of running it yourself. Do not buy it as the greenest Sunreef, because it is not — that argument belongs to the 70, the 80 and the 100.
Get the general arrangement drawn and the draft figure confirmed in writing before you commit, and you will know exactly what you are ordering.