March 5, 2026
The Sunreef 55 ULTIMA: When Speed Meets Silence on the Water
Narrower than many monohulls its length and drawing under a metre. The ULTIMA range exists to solve the one real problem with owning a catam…
Read the articleSunreef ULTIMA 55
Expert Review, Technical Specifications & Market Analysis
The Essentials
| Feature | Specifications |
|---|---|
| Overall Length | 16.6 m (55 ft) |
| Beam | 5.6 m (18 ft 4 in) |
| Draft | 0.9 m (2 ft 11 in) |
| Engines | Volvo Penta D6 IPS 650 classic; 2 × e-350 kW + 2 × 600 hp hybrid |
| Fuel Capacity | 1,500 l (396 US gal) |
| Water Capacity | 300 l (79 US gal) |
Source: Spec & Photos courtesy of Sunreef. Specs verified by Tony Smith, USCG 100 Ton Master, on August 11, 2026.
You want catamaran stability and an eleven-inch-under-a-metre draft without the beam that locks you out of every marina you like. The ULTIMA 55 is Sunreef's answer.
Part of the Sunreef ULTIMA series — see how owners step up through the lineup.
Quick Verdict
- 0.9 m (2 ft 11 in) of draft, the shallowest figure Sunreef publishes across all fourteen models, on a 5.6 m beam narrower than many monohulls of the same length
- The most completely specified electric drivetrain in the range: 2 × e-350 kW alongside 2 × 600 hp, with a 220 kWh bank at 625 V
- 300 l of water is a day boat's tankage — this is a coastal boat by design, not a passage-maker
Our Take
The ULTIMA range exists to solve the one real problem with owning a Sunreef: the beam. A sixty-foot Sunreef Power is ten and a half metres wide and your marina options collapse. The ULTIMA 55 is five point six metres wide — narrower than plenty of monohulls of the same length — and still draws only ninety centimetres. That is the whole pitch and it is a good one.
This is also the only model in the fourteen where Sunreef publishes a battery figure and a hybrid drivetrain specification together: 220 kWh at 625 volts, twin 350 kW electric motors alongside twin 600 hp diesels. Everywhere else in the range the Eco version is described rather than specified. Here you get numbers.
What you give up is water — three hundred litres is a day boat's tankage, not a cruiser's. Know what you are buying. This is a fast, shallow, beautifully engineered coastal boat, not a passage-maker.
Official Sunreef Premiere: Inside the Sunreef ULTIMA 55
Video courtesy of Sunreef.
Sunreef ULTIMA 55 Photo Gallery
Photos courtesy of Sunreef.
Sunreef ULTIMA 55 Overview
The Sunreef ULTIMA 55 is the smallest boat in the yard's ULTIMA range, a line of narrow-beam performance catamarans built around a different premise from the rest of the fleet. Sunreef publishes 16.6 m (55 ft) overall on a 5.6 m (18 ft 4 in) beam, with 0.9 m (2 ft 11 in) of draft.
Tankage is 1,500 l of fuel and 300 l of water. The hybrid specification is published in full: 2 × e-350 kW electric motors alongside 2 × 600 hp, with a 220 kWh battery bank at 625 V. The classic version runs Volvo Penta D6 IPS 650.
Sunreef files the ULTIMA range under Power Yachts. The yard also builds a BRABUS ULTIMA 55, a separate collaboration model.
Performance & Handling
Sunreef publishes no speed or cruise figure for the ULTIMA 55, and that is genuinely surprising on a boat the yard markets on pace — the range is described on Sunreef's own pages as solar speed boats. Those rows are empty because no figure is given.
What is published is unusually complete elsewhere. The hybrid drivetrain is specified as 2 × e-350 kW electric motors plus 2 × 600 hp, fed by a 220 kWh bank at 625 V. The classic version is Volvo Penta D6 with IPS 650 pods.
Draft is 0.9 m (2 ft 11 in) — the shallowest figure Sunreef publishes anywhere across the fourteen models we cover.
Interior & Accommodations
The ULTIMA trades beam for access, and the interior reflects that. At 5.6 m across, this is not the full-beam saloon of a 60 Sunreef Power; it is a sleeker, lower boat built around the cockpit and the helm.
Sunreef equips the range with folding bulwark platforms, custom sea-stairs and smart stowage for water toys, and finishes the hulls with ultralight flexible solar panels and non-toxic bottom paint.
No cabin or head count is published. With 300 l of water aboard, the accommodation is best understood as supporting day and weekend use rather than extended time at anchor.
Market Position
The ULTIMA range is Sunreef's answer to the objection that catamarans cannot be berthed. At 5.6 m of beam the 55 fits berths that a conventional power catamaran of the same length cannot, while keeping the shallow draft and the deck area that make multihulls attractive.
It competes less with other catamarans than with fast monohull day boats and sportsyachts, where it offers more stability at rest and dramatically less draft.
Within the ULTIMA range the 55 is the entry point, below the 66, 77 and 88. Sunreef also lists an ULTIMA 44 that sits below it.
Who the ULTIMA 55 Is For
Buy the ULTIMA 55 if you want catamaran stability and a sub-metre draft in a package that will actually fit your marina, and your use is coastal — days out, weekends, tenders and toys.
Step up to the ULTIMA 66 if you want the same idea with real tankage and guest accommodation. Step across to the 60 Sunreef Power if deck space and twelve guests matter more than berthing. Look elsewhere if you need a published top speed on a boat sold as a speed boat.
Sunreef ULTIMA 55 Articles & Guides
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Frequently Asked Questions
What is the Sunreef ULTIMA 55's hybrid system?
2 × e-350 kW electric motors alongside 2 × 600 hp, fed by a 220 kWh battery bank at 625 V. This is the most completely specified electric drivetrain Sunreef publishes on any model in the range — elsewhere the Eco version is described rather than specified. The classic version runs Volvo Penta D6 with IPS 650 pod drives.
How shallow does the Sunreef ULTIMA 55 draw?
0.9 m (2 ft 11 in) — the shallowest figure Sunreef publishes across the fourteen models we cover, on a 16.6 m (55 ft) hull. Combined with a 5.6 m (18 ft 4 in) beam that is narrower than many monohulls of the same length, it produces a boat that berths conventionally and anchors where far smaller craft would struggle.