Knaus Sun I 900 explained: A-class motorhome built for winter, comfort and long-haul touring
Knaus Sun I 900 brings winterized luxury to an A‑class motorhome: heated double floor, advanced insulation, 177‑liter fridge, Fiat Ducato power and a 10‑year leak‑proof guarantee. Get the key specs, layout tips and ownership notes for US readers.
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If winter is part of your travel plan, the Knaus Sun I 900 brings a true liner‑class experience to an A‑class motorhome. It combines a heated double floor, comprehensive insulation and upscale living spaces, then backs it with a 10‑year leak‑proof guarantee—rare peace of mind in the segment. The package rides on a Fiat Ducato chassis and comes with a 177‑liter refrigerator, a refined lighting concept and two practical floorplans for four. autoevolution+4knaus.com+4knaus.com+4
Key takeaways
The Knaus Sun I 900 is positioned as Knaus’s luxury liner for long seasons, not just summer weekends. Official equipment lists confirm a 132 kW (about 180 PS) power figure, interior height around two meters and a technical max mass of five tons. Autoevolution’s overview emphasizes winterization and the model’s comfort‑first brief. Together, these define a coach that prioritizes climate resilience, quiet cruising and premium fit‑and‑finish. knaus.com+1
Design and space
Inside the Knaus Sun I 900, the ambience targets “rolling penthouse” more than “weekend camper.” The brand highlights a yacht‑look heated double floor for even temperatures and extra storage, plus sophisticated ambient lighting integrated into the furniture. Two layouts are offered: rear twin beds or an alternative rear bed format, both paired with a drop‑down bed over the cab to keep capacity to four. The galley is full‑size by RV standards, headlined by a 177‑liter fridge with an oven set above it, a three‑burner cooker with glass cover and a recessed stainless sink. knaus.com+2knaus.com+2
Living ergonomics favor open sight lines from lounge to kitchen, and the heated double floor helps eliminate cold spots underfoot when temperatures fall. The Knaus Sun I 900 lighting design—called out specifically by reviewers—aims for a warm, hotel‑like feel rather than stark utility. knaus.com+1
Powertrain and road manners
Under the skin, the Knaus Sun I 900 uses the Fiat Ducato powertrain. Knaus lists 132 kW (≈180 PS) for the 900 LEG, paired with an automatic gearbox; Autoevolution’s article references the 2.3‑liter MultiJet 140 as a commonly seen configuration, illustrating how engines can vary by market and year. Expect relaxed highway pacing rather than sprinting performance, with the A‑class body emphasizing calm straight‑line stability and cabin isolation over quick steering response. knaus.com+1
For US readers, think in both metric and imperial as you plan routes. The coach’s exterior height is quoted at about 2.94 m (≈9.6 ft) and length around 8.82 m (≈28.9 ft), numbers that matter for campground and storage access as much as for lane discipline on narrow roads. knaus.com
Winterization and comfort tech
This is where the Knaus Sun I 900 separates itself. The model line is marketed with a heated double floor, robust insulation measures and a 10‑year leak‑proof guarantee across Knaus leisure vehicles, all backed by the brand’s published guarantee conditions. In plain English, the shell is designed to resist water ingress, which is critical for winter users who face freeze–thaw cycles. Pair that with the lighting concept and upscale materials, and the result is a coach ready for Colorado passes in January as well as Florida runs in March. knaus.com+1
Ownership notes for US buyers
The Knaus Sun I 900 is a European A‑class motorhome; US availability can vary and often involves specialty importers. Check height, width and length against your storage location and favorite parks, verify shore‑power adapters, and plan for metric‑to‑imperial conversions on service consumables. The fridge capacity translates to roughly 46.8 gallons, helpful for longer boondocking spells. Be sure to confirm warranty recognition with the selling partner and how the leak‑proof guarantee is administered on imported units. knaus.com+1
Quick spec snapshot
Chassis is Fiat Ducato with automatic transmission, engine output listed at 132 kW (≈180 PS). Exterior measures show about 8,820 mm length, 2,340 mm width and 2,940 mm height, with an interior height around 2,000 mm. Technical maximum authorized mass is 5,000 kg; payload and curb mass vary by equipment. These figures align with the 900 LEG equipment page and illustrate the liner’s substantial footprint. The Knaus Sun I 900 therefore feels planted on the highway and offers generous storage in practice. knaus.com
Brief road‑test perspective
Drive impressions from European testers characterize the Knaus Sun I 900 as a calm cruiser with excellent long‑distance manners. The A‑class body and insulation do their best work at speed by lowering noise and stabilizing cabin temperature, while the heated double floor keeps winter trips comfortable underfoot. Think of it less as a performance RV and more as a luxury apartment engineered to move confidently at motorway pace. knaus.com
Data box
Model name: Knaus Sun I 900 (example: 900 LEG)
Vehicle type: luxury A‑class motorhome, four‑berth layouts
Powertrain: Fiat Ducato, automatic transmission, 132 kW ≈ 180 PS listed
Body highlights: heated double floor, premium ambient lighting, extensive insulation
Key dimensions: length 8.82 m, width 2.34 m, exterior height 2.94 m, interior height 2.00 m
Cold‑weather credentials: winterization focus and 10‑year leak‑proof guarantee across Knaus leisure vehicles
Kitchen highlight: 177‑liter refrigerator with oven above, three‑burner cooker, recessed sink
Sources for figures: Knaus official equipment and highlights pages, Autoevolution model overview. knaus.com+2knaus.com+2
US‑centric buying tips
Hard numbers come first: measure your storage bay opening and campsite clearances before you fall in love with any luxury A‑class motorhome, including the Knaus Sun I 900. Then plan for cold‑weather use with a realistic electrical and heating setup—shore power adapters, battery capacity and propane or diesel heating strategies. Finally, confirm after‑sales support. The guarantee is impressive on paper; understanding how claims are handled for your specific VIN and selling partner is essential. knaus.com
One‑line verdict and ideal owner
The Knaus Sun I 900 is a winter‑ready premium liner that trades raw speed for silent, insulated comfort—ideal for travelers who want four‑season livability and a hotel‑grade interior on long tours. knaus.com
Sources
Autoevolution, “Survive Winter in Style With the Luxurious Knaus Sun I 900 Motorhome,” Jan 26, 2021. Emphasis on winterization, lighting and comfort; mentions 2.3‑liter MultiJet 140 and four‑berth layouts. autoevolution
Knaus official Sun I 900 LEG equipment page: dimensions, mass, power output and transmission. knaus.com
Knaus Sun I highlights: heated double floor and interior concept. knaus.com
Knaus “Structure & quality” page: 10‑year leak‑proof guarantee across Knaus leisure vehicles. knaus.com
Internal links
Get a feel for Knaus’s family-friendly layout logic in Knaus Van Wave 640 MEG — FoldXPanD 12 cm interior gain review before you dive into the Sun I.
To compare the FoldXPanD concept in a caravan setting, check Knaus Südwind 580 QS 60th — family caravan review side by side.
If you’re still deciding between body types, start with Motorhome vs. campervan — which one fits your life? to frame your use-case and budget.
For a benchmark on day-to-day usability in a popular competitor, see Why the VW California T7 became a global bestseller and map its strengths to your touring style.
External links
Knaus Sun I 900 LEG official equipment
Knaus Sun I highlights — heated double floor & insulation
Knaus 10-year leak-proof guarantee — structure & quality
Autoevolution overview of the Knaus Sun I 900
FAQ
Q1. What makes the Knaus Sun I 900 a winterized motorhome?
A1. The model line is promoted with a heated double floor and comprehensive insulation, features aimed at stable temperatures and protection in cold climates. knaus.com
Q2. What is the official power output and basic chassis?
A2. Knaus lists 132 kW (≈180 PS) on a Fiat Ducato chassis with automatic transmission for the 900 LEG; actual engine specs can vary by year and market. knaus.com
Q3. Is there a manufacturer guarantee against water ingress?
A3. Knaus publishes a 10‑year leak‑proof guarantee across its leisure vehicles, subject to conditions at delivery. knaus.com
Q4. How many people can sleep in it and what’s the fridge capacity?
A4. The layouts are designed for four, with a drop‑down bed over the cab and a rear sleeping area; the refrigerator is about 177 liters. autoevolution+1
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