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.

Black Cube Premium interior showing face-to-face seating and hexagonal back wall

Upgraded for 2026

What's New in the Premium

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.

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.
Deconord Hexagonal Back Wall

A stunning geometric decorative panel transforms the interior into a true design statement.
Floor-Embedded Heater

The HUUM Drop 9kW is now centrally positioned between benches with a protective guard – maximising space and heat distribution.
4 Strips of Dimmable LEDs

Double the lighting of the Classic with wireless dimmer control – set the perfect mood for relaxation.

The Heart of Your Sauna

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.

9kW

Heating Power

60kg

Stone Capacity

5 Year

Warranty

Smart Control

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.

WiFi

App Control

110°C

Max Temperature

19hr

Max Timer

Premium Features

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.

Complete Package

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

Technical Details

Full Specifications

Sauna Cabin

Capacity 4-6 People

Outer Dimensions (W × D × H) 2.19m × 1.66m × 2.23m

Inner Dimensions (W × D × H) 2.04m × 1.38m × 2.04m

Sauna Volume 5.7 m³

Weight ~750 kg

Wall Thickness 40mm Thermowood

Bench Material Alder

Front & Door 8mm Black Tempered Glass

Roof Square Shingle, Black

Heater & Electrics

Heater Model HUUM Drop 9kW

Heater Position Floor-Embedded (Central)

Stone Capacity 60 kg

Control Panel UKU Glass WiFi

Electrical Supply Single or 3-Phase

Current Draw (Single Phase) ~40 Amps

Cable Size (Suggested) 6.0 mm² or higher

Heat-Up Time ~30 minutes to 80°C

Heater Warranty 5 Years

Side by Side

Classic vs Premium

See how the new Premium compares to our Classic model.

Capacity

Up to 6 People

4 People

Bench Layout

Face-to-Face

L-Shaped

Bench Levels

3 Levels

2 Levels

Back Wall

Deconord Hexagonal

Plain Wood

Heater Position

Floor-Embedded (Central)

Wall-Mounted

Heater Model

HUUM Drop 9kW

Dimmable LED Strips

4 Strips

2 Strips

WiFi Control

UKU Glass

Price

£9,499

£7,699

Delivery & Installation

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.

What's New in the Premium

Face-to-Face Seating

Deconord Hexagonal Back Wall

Floor-Embedded Heater

4 Strips of Dimmable LEDs

HUUM Drop 9kW Heater

UKU Glass WiFi Control

Crafted for Excellence

40mm Thermowood

8mm Privacy Glass

Alder Benches

Dimmable LED Lighting

Branded Accessories

Estonian Craftsmanship

Everything You Need

Sauna Cabin

HUUM Drop 9kW

UKU Glass Control

Hexagonal Back Wall

LED Lighting

Bucket & Ladle

Heater Guard

Treatment Kit

Full Specifications

Sauna Cabin

Heater & Electrics

Classic vs Premium

From Our UK Warehouse to Your Garden

Free UK Mainland Delivery

Pallet Delivery

Self-Assembly Kit

Professional Installation Available

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