The Leil Black Cube Premium is a 4-6 person outdoor sauna kit featuring face-to-face seating with three-level alder benches, Deconord hexagonal back wall, floor-embedded HUUM Drop 9kW heater with WiFi control, and 4 strips of dimmable LED lighting. 40mm thermowood, 8mm black tempered glass. Estonian craftsmanship, UK stock. £9,499.

What's New in the Premium
The first batch of the new and improved Black Cube Premiums will reach our warehouse from early February 2026 and are now available for pre-order.
We listened to your feedback on the Classic and completely redesigned the interior. The result is a more social, more refined, and more immersive sauna experience. The new 3-step, tiered bench layout improves accessibility and seating flexibility, while the 1.3m long opposing benches allow you to seat up to 6 people, with excellent comfort for smaller groups.
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Face-to-Face Seating
Opposing benches maximise internal space and encourage a relaxed, social atmosphere. Designed to seat up to 6 people, with optimal comfort for 4 adults.
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Deconord Hexagonal Back Wall
A stunning geometric decorative panel transforms the interior into a true design statement.
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Floor-Embedded Heater
The HUUM Drop 9kW is now centrally positioned between benches with a protective guard – maximising space and heat distribution.
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4 Strips of Dimmable LEDs
Double the lighting of the Classic with wireless dimmer control – set the perfect mood for relaxation.
HUUM Drop 9kW Heater
The HUUM Drop is renowned for producing soft, long-lasting steam thanks to its innovative design. The stones are in direct contact with the heating elements, creating an authentic löyly that traditional Finnish sauna enthusiasts appreciate.
In the Premium, the heater is floor-mounted centrally between the benches with a protective heater guard, optimising heat distribution throughout the cabin while keeping you safe.


UKU Glass WiFi Control
The sleek black glass UKU control panel complements the Premium's aesthetic perfectly. Pre-heat your sauna from anywhere using the HUUM smartphone app – perfect for having it ready when you arrive home.
The intuitive touchscreen lets you set your preferred temperature, timer, and lighting with ease. Compatible with 2.4GHz WiFi networks.
Crafted for Excellence
Every detail of the Black Cube Premium has been considered to deliver an authentic, luxurious sauna experience.
40mm Thermowood
Premium grade thermowood walls and roof provide exceptional insulation and durability. No additional insulation needed.
8mm Privacy Glass
Black tempered safety glass on the front and door – provides privacy while letting in natural light.
Alder Benches
Premium alder wood benches stay comfortable to touch even at high temperatures. Three-level design for different heat intensities – an upgrade from the Classic's two levels.
Dimmable LED Lighting
4 LED light strips with wireless dimmer control. Create the perfect ambience for relaxation.
Branded Accessories
Includes Heracles Wellness branded black bucket and wooden ladle set – premium quality sauna essentials.
Estonian Craftsmanship
Manufactured by Leil Saunas in Estonia – a country with deep sauna traditions and exceptional woodworking expertise.
Everything You Need
The Black Cube Premium arrives as a complete kit with all components included. No hidden extras or missing parts.
Sauna Cabin
Complete 40mm thermowood structure
HUUM Drop 9kW
With heater guard & side panel
UKU Glass Control
WiFi-enabled touchscreen
Hexagonal Back Wall
Deconord decorative panels
LED Lighting
4 strips with wireless dimmer
Bucket & Ladle
Heracles branded set
Heater Guard
Protective safety rail
Treatment Kit
Paint & oil for finishing
Full Specifications
Sauna Cabin
Heater & Electrics
Classic vs Premium
See how the new Premium compares to our Classic model.
From Our UK Warehouse to Your Garden
The Black Cube Premium is held in stock at our Essex warehouse for fast UK delivery. It arrives flat-packed on a pallet with comprehensive assembly instructions.
Free UK Mainland Delivery
In stock and ready to ship from our Essex warehouse. 3-5 working days.
Pallet Delivery
Arrives on a pallet (~1.2m H × 1.2m D × 2.12m L) via tail lift truck.
Self-Assembly Kit
Detailed instructions included. DIY in a few days, or 1 day with our team.
Professional Installation Available
Our expert team of 3 carpenters can build your Premium in just one day. Prices start from £1,500 + VAT, depending on your location from London.