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Swell Black Eco 4
Traditional Sauna For Four
Rated 4.9 out of 5 stars
37 Reviews
Built from Western Red Canadian Cedar, inside and out
No VOC or toxic glues
6kW Harvia Wall Heater — reaches 100°C
Best looking sauna on the market
Installation Team Australia Wide
Your sauna package
Choose your heater package
Your selection updates the sauna price automatically.
Swell Black Eco 4
Package price
AUD, including GST. Contact our team for delivery and optional extras.
Harvia Sauna Stones (20kg)
$142.00
Included for a limited time
Harvia Black Sauna Speaker
$158.00
Swell Signature Merino Wool Sauna Hat
$98.00
Have a question? We’ve got you.Contact Us
Have a question?
Speak with one of our Australian Sauna Reps
Australian Dispatch Schedule
Confirmed dispatch windows for Australia-wide delivery
July 5-10
SOLD OUT
100% allocated
July 25-30
SOLD OUT
100% allocated
August 28-30
SOLD OUT
100% allocated
August 28-30 (Extra Stock)
SOLD OUT
100% allocated
October 20-30
SOLD OUT
100% allocated
January 2027
SOLD OUT
100% allocated
16-week lead time
Installation in Your Home
Compare the three heater packages. Swipe sideways on mobile to view all columns.
| Requirements | Base SW60 | Smart Heat SW60E + Fenix Wi-Fi | Pro Spirit SP60E + Xenio Wi-Fi |
|---|---|---|---|
| Temperature range | 65–80°C | 65–100°C | 65–100°C |
| Voltage | 220–240 V | 220–240 V | 220–240 V |
| Heater power | 6,000 W | 6,000 W | 6,000 W |
| Heater supply | 32 A | 32 A | 32 A |
| Lighting supply | Separate 10 A | Shared 32 A | Shared 32 A |
| Circuits required | 2 circuits | 1 circuit | 1 circuit |
| Wi-Fi panel included | ✕ | ✓ | ✓ |
| Heater & lighting share one supply | ✕ | ✓ | ✓ |
| Separate lighting circuit required | ✓ | ✕ | ✕ |
| Power cord / plug supplied | ✕ | ✕ | ✕ |
| Licensed electrician required | ✓ | ✓ | ✓ |
Electrical requirements: All packages must be hardwired by a licensed electrician. The Base package requires a 32 A circuit for the heater and a separate 10 A circuit for lighting. Smart Heat and Pro use one 32 A circuit for the heater and lighting.
Your electrician must verify the supplied heater and controller models, circuit ratings and installation requirements against the manufacturer’s instructions and applicable electrical standards before installation.
Installation support, Australia-wide.
We work with installation partners across Australia. At-home installation for the Eco-4 typically costs $599, excluding electrical works. All electrical work must be completed by a licensed electrician.
Please contact our team to confirm installation availability and pricing for your home. You’ll receive our installation team’s contact details once you’ve made a purchase.
Overview
Inclusions
Specifications, Drawings & Dimensions
Guarantee & Shipping
Heat up time
20min
Heat up time is to 80°C with our 6kW Harvia heater and insulated wall system, including a premium aluminium vapour barrier inside the wall cavity for fast heat-up times and long-term durability.
Western Red Canadian Cedar
30day kiln-dried
Our Canadian-sourced Western Red Canadian Cedar is kiln-dried for this long to help assure outdoor durability.
Swell sauna sales
80%
The ECO 4 is the best-selling sauna on the market.
Sold Australia-wide
3,000+
Units sold Australia-wide.
Warranty
5year*
Backed by Swell’s 5-year warranty for long-term peace of mind.
Insulating Technology
Industry-leading design. Industry-leading construction.
The ECO 4 is engineered as a layered outdoor sauna system, not a simple timber box. Each wall layer is designed to hold heat, manage moisture and protect the structure through year-round Australian conditions.
Double wall construction
A layered wall system creates a stronger thermal envelope than single-skin designs, helping the ECO 4 retain heat more efficiently while improving long-term rigidity outdoors.
Insulated interior
Insulation sits behind the internal cedar lining to reduce heat loss through the wall cavity, supporting faster warm-up, steadier session temperatures and a more comfortable sauna experience.
Aluminium vapour barrier
A reflective aluminium vapour barrier helps direct radiant heat back into the sauna while protecting the wall system from moisture movement inside the heated space.
Built for outdoor performance
Premium cedar, considered wall layers and a proven Harvia heater work together to deliver the proper traditional heat Swell customers expect — with the durability needed for Australian backyards.
Premium timber
Western Red Cedarwood.
Sourced from Canada, Western Red Cedar is one of the best timbers for outdoor saunas — naturally durable, weather-stable and premium in finish.
PRESENTING OUR PREMIUM SAUNA.
SWELL ECO4
You have been looking for a while now. heres australia's #1 premium sauna. ask around.
THE BENCHMARK FOR HOME SAUNAS IN AUSTRALIA
SUBTLE. PREMIUM. BUILT TO LAST
Welcome to Premium Sauna Living
The interior of the Eco 4 is finished with premium Canadian Western Red Cedar cladding, responsibly sourced and rich in natural character. The timber releases a warm, natural aroma and refined finish that makes the sauna feel as good as it looks.
ITS HOT. AS HOT AS 100°C.
Feel the Power of Harvia
Swell saunas use premium Harvia Wall heaters, a 6kW heater in the Eco 4 model. Heat is never a limitation, with consistent, even performance reaching up to 100°C to deliver a true traditional sauna experience session after session.
TIMBER STRAIGHT FROM CANADA
Built From Cedar, Designed For Stillness
The Eco 4 is crafted with clear-grade cedarwood cladding, selected for its natural durability, stability, and timeless appearance. Inside, the sauna remains completely chemical free, allowing the timber to breathe and release its natural aroma as the space warms. Built for outdoor use, the Eco 4 is designed to handle year round conditions while maintaining its refined finish. Every element is considered, with Swell’s signature details throughout to deliver a calm, considered recovery experience.
PREMIUM ENGINEERING. FULL CONTROL.
Designed With The Best Technology
Choose the heater package that suits your Eco 4. The Base package features the Harvia The Wall 6kW SW60E. The Smart Heat package pairs the SW60E with the Harvia Fenix Wi-Fi panel, while the Pro package pairs the Harvia Spirit 6kW SP60E with the Harvia Xenio Wi-Fi panel.
Wi-Fi control is included with the Smart Heat and Pro packages. Your selected package updates the sauna price.
ECO 4 FAQ
Frequently Asked Questions
Answers to the most common questions about power, installation, delivery and daily use for the Swell Black Eco 4 outdoor traditional sauna.
What power does the Swell Black Eco 4 need?
The Swell Black Eco 4 uses a premium Harvia The Wall 6kW traditional sauna heater and requires a dedicated 25A single-phase circuit installed by a licensed electrician. We intentionally oversize the heater for reliability, strong performance and fast heat-up times, while keeping the sauna below the larger three-phase requirements that are not universal for Australian homes.
Do I need three-phase power?
No. The ECO 4 does not require three-phase power. It is designed so it can be installed in standard Australian homes with the correct dedicated single-phase circuit added by a licensed electrician.
Is the ECO 4 a traditional sauna or infrared sauna?
The ECO 4 is a traditional Finnish-style sauna, not an infrared sauna. It uses a Harvia heater and sauna stones to create full-room heat and steam when water is poured over the stones.
What base or surface does it need?
The sauna simply needs a level, compacted surface. Concrete, pavers, decking or a prepared compacted area can all work well. We recommend avoiding direct placement on grass because grass can hold moisture under the base.
What are the ECO 4 dimensions?
The ECO 4 body measures 163cm wide x 159cm deep, with a sloped roof height of 220cm at the front and 210cm at the rear. The roof measures 206cm wide x 189cm deep.
How is the sauna delivered?
Swell saunas are dispatched from our Melbourne warehouse in protective cartons. Once your order is on the way, you will receive tracking details so you can follow the delivery and plan around its arrival.
Can I install the ECO 4 myself?
The ECO 4 is made for DIY setup, with pre cut components and clear, step by step instructions. Most customers can move the cartons into position and complete the assembly with two people over a few hours. If you would prefer a hands off setup, we have a team available Australia-wide to handle the assembly for an extra cost. Please reach out and we can help arrange it. A licensed electrician is still required to connect the heater.
How hot does it get and how fast does it heat up?
The ECO 4 heats to 80°C in around 20 minutes and reaches 90–100°C+ with extended use depending on conditions. It uses a premium Harvia The Wall 6kW heater to deliver strong traditional heat for a 3–4 person outdoor sauna.
How many people does the ECO 4 fit?
The Swell Black Eco 4 is designed for 3–4 people, making it suitable for couples, families and shared recovery sessions at home.
What warranty is included?
The Swell Black Eco 4 includes a 5-year warranty for long-term confidence. It is built with premium materials and designed for Australian outdoor conditions.
Speak With A Swell Specialist
A brief consultation to help you choose the right ice bath and sauna setup.
97%would recommend this product
Slide 1 selected
37 reviews
- ZZoëVerified ReviewerRated 5 out of 5 starsLOVE LOVE LOVE
Had the Eco4 for a few months now & we use it every night, if not day. It really is a treat. Unlike large gym saunas, its quick to heat & provides such a special space. Its my go to sanctuary. After a long (or short) day I can't wait to hop in & get this special time. The wifi is fab so it can be turned on remotely from anywhere, ready to hop in when home or otherwise. Can also listen to music/podcasts/whatever. Solid as, smells delightful. Couples well with a cold outdoor shower. Best purchase ever. Its my favourite room in the house🙌🏼
- MJMarcus J.Rated 5 out of 5 starsGood!
Order has been received and installed and everything is going great so far.
- EPEsada P.Verified ReviewerRated 5 out of 5 starsLove it!
We Love it!
- MCMacy C.Rated 5 out of 5 starsBeautiful Spa
Love my Swell Black eco4. Experience was wonderful and enjoying it every day
- GMGerald M.Rated 5 out of 5 starsEco 4 Traditional Sauna
Very happy with the purchase. Sauna looks great and has been getting used nightly - heats very hot.
