Saunasell Black Cube Premium 4 Person Outdoor Sauna Kit

We’ve taken your feedback on the previous version of the Black Cube to heart and are excited to introduce the new and improved Black Cube Premium.

This enhanced model boasts a striking black full glass front and gives you the option of either the Sawo 9kW Aries Free Standing Heater with safety guard or the HUUM Drop 9kW Wall Mounted Heater. It also includes the UKU WiFi Glass Control and comes with a complimentary bucket, ladle, and thermometer set.

Don't be deceived by its compact size or affordable price; this sauna is crafted with superior materials and can easily seat four people comfortably.

Back to Black

If you live by the motto “black goes with everything,” then the Black Cube premium is your new best friend. Wrapped in a sleek, all-black exterior, this sauna doesn’t just sit in your garden—it makes a statement. It’s the sauna Batman would choose (if he ever took a day off). With its tempered black glass, dimmable LED mood lighting, and a Sawo heater that heats things up as much as your style does, it’s not just a place to relax—it’s a conversation starter. Who knew sweating in style could look this good?

Build Your Sauna with Ease

As the name suggests the Black Cube comes as a kit for self assembly, hence the affordable price. But don't worry, it comes with very detailed assembly instructions (which you can find under the delivery and installation tab above) and should take no more than a few days to build if you know what you are doing.

Let Our Expert Team Handle the Assembly for You

Our expert assembly team can install the Black Cube Premium in your garden. A team of three skilled carpenters will complete the job in just one day. If you’d like a quote, please get in touch and let us know your location. Installation costs are calculated based on their travel time from London. See them in action below!

What’s Included in the Black Cube Kit:

• Black Cube Premium Sauna with Full Glass Front (worth £5,999)

• Your Choice of Heater:
   – Sawo Aries 9kW Free-Standing Heater with Guard (worth £1,199)
   – or HUUM Drop 9kW Wall-Mounted Heater (worth £1,699)

• UKU Glass WiFi Control Panel (worth £699)

• Heater Guard (worth £199)

• Dimmable LED Lighting (worth £249)

• Bucket, Ladle & Thermometer Set (worth £99)

Choose Your Package:

Sawo Package – £6,999
If purchased separately: £8,444
You save: £1,645

HUUM Package – £7,499
If purchased separately: £8,944
You save: £1,645

Sawo Aries Round 9kW Freestanding Heater

FAQ - Black Cube

If you have more questions please call us or let us know in the chat, we will then add these questions here.

Q. How is it delivered?

The Black Cube is delivered on a large pallet weighing approximately 750kg, using a tail lift truck. Upon arrival, the pallet will be transferred onto a pump truck trolley and carefully wheeled onto the tail lift. The tail lift will then be lowered, and our driver will move the pallet as far into your driveway as possible.

Please note: if you have a gravel driveway, this may present a challenge for the trolley. To help ensure smooth delivery, we recommend laying down mats or boards in advance if you’d like the pallet wheeled across the gravel.

Q. Should I choose the Sawo Aries or the HUUM Drop heater?

Both heaters are high-quality options, but they cater to different needs and preferences. The Sawo Aries 9kW is a free-standing heater with a modern industrial look. It includes a protective safety guard, making it a practical choice for families or compact setups where added protection is important. It delivers a strong, efficient heat and is included in the lower-priced version of the Black Cube kit (£6,799).

On the other hand, the HUUM Drop 9kW is a wall-mounted heater known for its sleek, award-winning design inspired by a water droplet. It holds up to 60 kg of stones, producing a softer, more traditional steam (löyly) and offering a more spa-like sauna experience. However, due to the compact interior of the Black Cube, it’s not possible to fit a safety rail on the HUUM Drop, which may be a consideration if safety barriers are a priority. This version of the kit is priced at £7,299.

Both heaters are compatible with the UKU Glass Wi-Fi Control, so you can start your sauna from your smartphone—whichever you choose.

Q. How big is the pallet it is delivered on?

The pallet measures approximately 1.2m (H) x 1.2m (D) x 2.12m (L). You’ll need enough space on your driveway for it to be dropped off. If that’s not possible, our drivers will leave it kerbside, and it will need to be unpacked by hand—either by you or our assembly team.
For reference, here’s a photo of our director Keith (5ft 10”) standing on top of one of the pallets.

Q. Can I assemble the sauna myself?

While it's technically possible to assemble the sauna yourself, we strongly recommend having a qualified carpenter or joiner assist you—especially if you don't have prior experience with carpentry or working with wood.

The assembly manual is detailed and user-friendly for those familiar with construction, but without that background, the process can be challenging and time-consuming. Most of our customers choose professional installation for peace of mind and to ensure everything is assembled correctly.

Please note: improper assembly or failure to follow the manual may void the warranty, so if in doubt, we recommend seeking professional help.

Q. How much does it cost to get it assembled by the Heracles Team?

Assembly for this model starts at £1,500 + VAT, with the final cost depending on your location—prices increase the further we travel from London. A team of 3 carpenters will build it for you in one full day. To get an accurate quote, just send us your postcode and we’ll confirm the exact cost.

Installation is invoiced separately and typically arranged closer to your delivery date. While it’s possible to hire a local carpenter for assembly, please note that our team has extensive experience building this exact model, ensuring everything is done efficiently and correctly.

Q. How long does it take to get hot?

Typically, it takes around 30 minutes to reach 80°C. However, this can vary depending on factors such as the outside temperature, wind conditions, ventilation settings, and the intensity level you choose. Most customers report their sauna reaches the desired temperature within 20-30 minutes.

Q. How many people does this hold?

The bench along the back is 2m and 1.2m in the side, so you could easily seat 4 people, 5 at a push. You could also have one person lying down along the back, and another with their back against the wall and legs fully extended.

Q. What base do I need?

When planning the base for your Black Cube, there are two key requirements to keep in mind.

First, the base must be completely level, and secondly, it must be able to support the weight of the sauna and the maximum number of users. The sauna itself weighs 750kg's, so be sure to account for an additional 400kg's for users when choosing your base material. This can include concrete, patio decking, tiles, asphalt, and more, as long as it is flat and sturdy enough to hold up to 1,150kg's.

To avoid any potential issues, it is recommended to avoid placing the base on a slope or an area prone to water pooling.

Q. What maintenance is required after I assemble my sauna?

Your Black Cube already comes with treatment oil, so after it's assembled there will be no maintenance for 12 months. We recommend then treating the wood every 12 months to prevent the colour from fading. You can use any breathable oil based treatment for this such as Osmo oil, linked below.

Q. Can the sauna be painted a different colour?

Yes, you can paint it any colour you like as long as it is a breathable treatment.

Q. Why is there no insulation in this sauna?

Most simply put, it's not necessary. This is a compact sauna, the thermowood is 40mm thick and has excellent insulation properties and the sauna is designed to minimise heat loss.

Q. How long will it take to assemble my Black Cube Kit?

If you are handy with tools and have someone helping you, it could be done in a couple of days. However, most do it in a week or so. Our install team will do it in one day.

Q. Do I need a 3 phase supply?

No, however, you must get a qualified electrician to connect your heater to your power supply. You will need an isolator as a minimum. 

Q. Do we have a showroom?

Not yet, however, we have a referral scheme where existing customers can let you view their sauna. If you let us know where you are based, we can see if there's an already installed sauna near you.

Q. Can I swap the heater or anything else in the kit?

Unfortunately not. These are prepackaged kits which are sitting in our warehouse and ready to go. We believe that everything in the kit is perfect for this sauna. If you would like to choose your own specification, you could look at the Dice range which is customisable.

Q. Why choose the Black Cube over other models like the Camilla?

The Black Cube features thicker wood, a WiFi-enabled heater, and a sleek black design. The Camilla is more budget-friendly but lacks some of these premium features, but it does have a more traditional look.

Q. What does the WiFi heater allow me to do?

You can control the sauna from anywhere via the Huum smartphone app, as long as your heater is connected to your home WiFi and your phone has internet.

Q. Does the WiFi control work on all networks?

The WiFi controller only supports 2.4GHz networks. Make sure your router can transmit this frequency.

Q. What electrical setup is required?

The sauna requires a qualified electrician to install. Wiring details are provided in the manuals under the “Electrical Supply” section. The heater is 7.5kW and operates on a single-phase setup. Make sure your electrician reviews the UKU control manual and Sawo Aries heater manual.