Celsium sauna buying guide
The five Celsium saunas we carry are outdoor saunas handcrafted in Lithuania by Celsium, in two designs: three from Celsium's Jonas line, with an aspen interior and a bronze-tinted glass front, and two Ula models, with ThermoWood® inside and out and a full bronze-tinted glass front. Each arrives as a flat-pack kit for assembly on your own foundation, and the heater is sold separately, paired by our specialists with your cabin and your electrical service. This guide compares the five on seating, size, heater output, foundation, delivery and setup, from each product page. Sauna Republic is an authorized Celsium dealer.
The Celsium saunas at a glance
Three of the five come from Celsium's Jonas line: the Celsium Jonas Grand 6-Person Outdoor Sauna seats up to six, the Celsium Jonas Classic 4-Person Outdoor Sauna up to four and the Celsium Jonas Mini 2-Person Outdoor Sauna up to two. The two Ula models, the Celsium Ula Mini 2-Person Outdoor Sauna and the Celsium Ula Micro Compact 2-Person Outdoor Sauna, each seat up to two. Our Celsium Saunas collection shows all five together.
All five share a ThermoWood® exterior in Beige, Grey, Ebony, Teak or Hazel, a bronze-tinted glass front, a full-height tempered glass door and an indoor LED strip, which is included and installed on site. Celsium is a member of Sauna from Finland, the North American Sauna Society and the Australian Sauna Association.
| Product | Design | Seats | Exterior (W × L × H) | Footprint | Heater (sold separately) | Warranty |
|---|---|---|---|---|---|---|
| Celsium Jonas Grand 6-Person Outdoor Sauna | Jonas line; aspen interior, PIR insulation, EPDM rubber roof | Up to 6 | 85.0" × 109.6" × 98.0" | About 64 sq ft | At least 11 kW (Celsium) | 5 years on the structure, 2 years on all other parts |
| Celsium Jonas Classic 4-Person Outdoor Sauna | Jonas line, square footprint; aspen interior, PIR insulation, EPDM rubber roof | Up to 4 | 85.0" × 85.0" × 98.0" | About 50 sq ft | At least 9 kW (Celsium) | 5 years on the structure, 2 years on all other parts |
| Celsium Jonas Mini 2-Person Outdoor Sauna | Jonas line; aspen interior, PIR insulation (Celsium's product sheet) | Up to 2 | 85.0" × 60.4" × 98.0" | About 36 sq ft | 4.5 to 6 kW (Celsium's product sheet) | 5 years on the structure, 2 years on all other parts |
| Celsium Ula Mini 2-Person Outdoor Sauna | Ula; ThermoWood® inside and out, rounded corners | Up to 2 | 49" × 81" × 83" | About 27.6 sq ft | 6 kW (Celsium's product sheet) | 2 years |
| Celsium Ula Micro Compact 2-Person Outdoor Sauna | Ula; ThermoWood® inside and out, capsule shape | Up to 2 | 49.2" × 53.1" × 90.6" | About 18.1 sq ft | 3.5 to 4.5 kW (Celsium's product sheet) | 2 years |
The Jonas Classic, Jonas Mini and Ula footprints are calculated from the exterior dimensions. The heater figures for the Jonas Grand and Jonas Classic come from Celsium's US listings; the other three come from Celsium's product sheets.
The saunas, model by model
Celsium Jonas Grand 6-Person Outdoor Sauna
The Jonas Grand seats up to six on Celsium's standard layout: two straight aspen benches, an upper and a lower tier, each 72.2" × 23.6" (1,835 × 600 mm). Celsium sets the bench heights to Finnish sauna standards. The cabin measures 85.0" W × 109.6" L × 98.0" H (2,160 × 2,785 × 2,490 mm), a footprint of about 64 sq ft, and the interior 73.2" W × 97.8" D × 84.3" H (1,860 × 2,485 × 2,140 mm), about 349 cu ft calculated from those dimensions.
One large bronze-tinted glass panel covers most of the 85" end wall. The full-height 8 mm tempered glass door is in the left-hand long side, at the end nearest the glass, and opens outward. Celsium insulates the walls, ceiling and floor with 5 cm (about 2") PIR insulation boards and covers the roof with EPDM rubber roofing; the exterior is ThermoWood® and the interior aspen.
The heater is sold separately: Celsium specifies at least 11 kW. Celsium's US listing gives the weight as approximately 1,984 lbs (about 900 kg), and Celsium covers the structure for 5 years and all other parts for 2 years.
Celsium Jonas Classic 4-Person Outdoor Sauna
The Jonas Classic seats up to four on a square footprint of about 50 sq ft; it measures 85.0" W × 85.0" L × 98.0" H (2,160 × 2,160 × 2,490 mm). Its two straight aspen benches, an upper and a lower tier, are each 72.2" (1,835 mm) long; the upper bench is 22.8" (580 mm) deep and the lower 20.3" (515 mm). Celsium sets the bench heights to Finnish sauna standards. The product page gives no interior dimensions, so if you need them, we confirm them with your quote.
The front is one large bronze-tinted glass panel covering most of the wall, and the full-height 8 mm tempered glass door is in the left-hand side wall, at the end nearest the glass. The construction matches the Jonas Grand's: a ThermoWood® exterior, an aspen interior, 5 cm PIR insulation boards in the walls, ceiling and floor, and EPDM rubber roofing.
The heater is sold separately: Celsium specifies at least 9 kW. Celsium's US listing gives the weight as approximately 1,543 lbs (about 700 kg), and Celsium covers the structure for 5 years and all other parts for 2 years.
Celsium Jonas Mini 2-Person Outdoor Sauna
The Jonas Mini seats up to two, side by side on a full-width upper bench, facing the glass. Celsium's drawing shows the upper bench at 71.7" × 23.6" (1,820 × 600 mm), with a lower bench of 39.4" × 11.8" (1,000 × 300 mm) and a footrest of 39.4" × 7.9" (1,000 × 200 mm) beneath it. The cabin measures 85.0" W × 60.4" L × 98.0" H (2,160 × 1,535 × 2,490 mm), a footprint of about 36 sq ft, and the interior 73.2" W × 48.4" D × 82.7" H (1,860 × 1,230 × 2,100 mm), about 170 cu ft calculated from those dimensions.
Its glass runs across the 85" wide face: one large bronze-tinted panel covers most of it, and the full-height 8 mm tempered glass door is in the left-hand 60.4" side wall, at the end nearest the glass. The exterior is ThermoWood® and the interior aspen, and Celsium's Jonas Mini sheet lists 5 cm PIR insulation in the walls, ceiling and floor.
The heater is sold separately: Celsium's product sheet recommends 4.5 to 6 kW of heater output. Celsium's US listing gives the weight as approximately 1,213 lbs (550 kg), and Celsium covers the structure for 5 years and all other parts for 2 years.
Celsium Ula Mini 2-Person Outdoor Sauna
The Ula Mini seats up to two, side by side on the upper bench, facing the glass. Celsium's drawing shows an L-shaped upper bench, 62.8" × 19.7" (1,595 × 500 mm) along the back wall with a 38.2" × 14.6" (970 × 370 mm) section along one side, and a lower bench in front of it, marked 38.4" × 20.5" (975 × 520 mm). Rounded corners give the cabin its distinctive look. It measures 49" W × 81" L × 83" H (1,250 × 2,050 × 2,100 mm), a footprint of about 27.6 sq ft, and Celsium's product sheet gives the interior as 41.3" W × 76.8" L × 74.8" H (1,050 × 1,950 × 1,900 mm).
The front is bronze-tinted glass across the 81" side, with a full-height tempered glass door at its center; Celsium's product sheet gives the door as 8 mm tempered glass. Celsium's US listing specifies ThermoWood® inside and out, with aspen benches, and Celsium's product sheet gives the wall boards a thickness of 44 mm (about 1.7").
The heater is sold separately: Celsium's product sheet recommends 6 kW of heater output. Celsium's US listing gives the weight as approximately 1,213 lbs (550 kg) and the warranty as 2 years.
Celsium Ula Micro Compact 2-Person Outdoor Sauna
The Ula Micro Compact seats up to two, side by side on its 46.9" upper bench, facing the glass. Celsium's drawing shows the upper bench at 46.9" × 19.7" (1,190 × 500 mm) along the back wall, with a lower step in front of it, marked 26.8" × 10.8" (680 × 275 mm). An arched top and rounded base give the cabin its capsule shape. It measures 49.2" W × 53.1" L × 90.6" H (1,250 × 1,350 × 2,300 mm), a footprint of about 18.1 sq ft, and Celsium's product sheet gives the interior as 39.4" W × 49.2" L × 82.7" H (1,000 × 1,250 × 2,100 mm).
The front, on the 53.1" side, is bronze-tinted glass set within the rounded timber frame, with a full-height tempered glass door at its center (8 mm, per Celsium's product sheet). Like the Ula Mini, it has ThermoWood® inside and out per Celsium's US listing, with an aspen bench and, per Celsium's product sheet, 44 mm (about 1.7") wall boards.
The heater is sold separately: Celsium's product sheet recommends 3.5 to 4.5 kW of heater output. Celsium's US listing gives the weight as approximately 1,213 lbs (550 kg) and the warranty as 2 years.
Jonas or Ula: how the two designs differ
Beyond the features all five share, the two designs differ in these ways:
| Feature | Jonas Grand, Jonas Classic and Jonas Mini | Ula Mini and Ula Micro Compact |
|---|---|---|
| Interior | Aspen walls and benches | ThermoWood® inside and out, per Celsium's US listings, with aspen benches (Ula Mini) or an aspen bench (Ula Micro Compact) |
| Walls | 5 cm (about 2") PIR insulation boards in the walls, ceiling and floor; for the Jonas Mini, per Celsium's product sheet | 44 mm (about 1.7") wall boards, per Celsium's product sheets |
| Glass front | One large bronze-tinted glass panel on the 85" side | A full bronze-tinted glass front: along the 81" side of the Ula Mini and on the 53.1" side of the Ula Micro Compact |
| Door | Full-height 8 mm tempered glass door in the left-hand side wall, at the end nearest the glass | Full-height tempered glass door at the center of the glass front (8 mm, per Celsium's product sheets) |
| Profile and height | 98" tall | Rounded corners on the Ula Mini (83" tall); an arched top and rounded base on the Ula Micro Compact (90.6" tall) |
| Warranty | 5 years on the structure, 2 years on all other parts | 2 years, per Celsium's US listings |
ThermoWood® is thermally modified timber: wood treated with high heat and steam instead of chemicals. The process makes it more stable and more resistant to moisture and decay than untreated wood, which suits outdoor cladding. Our guide to the best wood for a sauna covers thermally modified wood and aspen in more depth.
All five come in the same five exterior colors: Beige, Grey, Ebony, Teak and Hazel. Every Celsium sauna is crafted from natural wood, so the final color and grain may vary slightly from the images. On the product page, the configurator lets you pick a color or choose "Not sure yet" and decide with your quote.
Celsium's photos and renderings are for illustration. Some Jonas photos show the door on the opposite side, and some Ula images show a timber front with a central glass door; the Jonas models come with the left-hand door, and both Ula models with the full bronze-tinted glass front. The heaters and controls in the images are sold separately, and the lighting in Celsium's photos may differ from the included LED strip. Each product page's specifications describe what's included.
Which Celsium sauna fits your space
Start with the number of bathers, then the space and the way the glass will face, then the heater and its circuit, covered in the next section. All five are outdoor saunas: our sauna size guide covers how much space a sauna needs, and our indoor vs outdoor sauna guide covers what an outdoor installation involves.
Choosing between the three two-person saunas
The Jonas Mini, the Ula Mini and the Ula Micro Compact each seat up to two. They differ in shape, size, benches and heater output:
| Model | Exterior (W × L × H) | Footprint | Interior (Celsium's product sheet) | Benches | Glass and door | Heater output (Celsium's product sheet) | Warranty |
|---|---|---|---|---|---|---|---|
| Celsium Jonas Mini 2-Person Outdoor Sauna | 85.0" × 60.4" × 98.0" | About 36 sq ft | 73.2" × 48.4" × 82.7" | Full-width upper bench, lower bench and footrest | Glass across the 85" face; door in the left-hand side wall | 4.5 to 6 kW | 5 years on the structure, 2 years on all other parts |
| Celsium Ula Mini 2-Person Outdoor Sauna | 49" × 81" × 83" | About 27.6 sq ft | 41.3" × 76.8" × 74.8" | L-shaped upper bench and a lower bench | Full glass front on the 81" side; central door | 6 kW | 2 years |
| Celsium Ula Micro Compact 2-Person Outdoor Sauna | 49.2" × 53.1" × 90.6" | About 18.1 sq ft | 39.4" × 49.2" × 82.7" | Upper bench and a lower step | Full glass front on the 53.1" side; central door | 3.5 to 4.5 kW | 2 years |
The Ula Micro Compact has the smallest footprint of the five we carry and stands taller than the Ula Mini: 90.6" against 83" outside and, per Celsium's product sheets, 82.7" against 74.8" inside. The Ula Mini is longer, with its glass along the 81" side. The Jonas Mini has the same aspen interior as the Jonas Grand and Jonas Classic and, per Celsium's product sheet, 5 cm PIR insulation, in a cabin 85" wide.
For closer comparisons, see our Jonas Grand, Jonas Classic and Jonas Mini comparison and our Ula Mini and Ula Micro Compact comparison.
Heaters and electrical service
None of the five includes a heater. The heater is sold separately so it can be matched to your site and electrical service, and our specialists pair the heater, control and stones with your cabin and your electrical service. Each product page gives Celsium's heater figure:
Apart from the heater output, every page lists the same items as required for operation and sold separately: an electric sauna heater, a heater control (if not built into the heater) and sauna stones sized to the heater, a dedicated electrical circuit installed by a licensed electrician, and the solid, level foundation. The heaters in Celsium's photos and renderings are sold separately and are not a recommended pairing for the cabin they appear in.
The electrical service depends on the heater you choose. The heater is hardwired on a dedicated circuit, and a licensed electrician should size the breaker and wire to the heater's nameplate rating; our installer and electrician directory lists electricians near you. Requirements for outdoor structures and electrical work vary by location, so check with your local building department before installation; your electrician can advise on permits for the heater circuit.
When you request pricing, we put a heater, control and stones on the quote, sized to the cabin and to your electrical service, or check a heater you already have against the cabin before anything ships.
We carry electric heaters from Harvia, HUUM and other brands in Electric Sauna Heaters, including the Harvia and HUUM collections, and our electric sauna heater comparison covers the brands. General sizing rules, such as those in our heater sizing guide, can give a different figure from Celsium's; for these cabins, the Celsium figures on each product page apply. For running costs, see how much electricity a sauna heater uses.
Planning a Celsium sauna?
Tell us the model, where it will stand and the electrical service available. We confirm your site, power supply and configuration, then send a delivered price with the heater pairing and financing options.
Get PricingFoundation, delivery and assembly
Each Celsium sauna needs a solid, level foundation of at least the size its product page gives. Have it ready before delivery so the kit can be assembled straight onto it.
| Model | Minimum foundation (Celsium) | Exterior footprint |
|---|---|---|
| Celsium Jonas Grand 6-Person Outdoor Sauna | 86.6" × 110.2" (2.2 × 2.8 m) | 85.0" × 109.6"; about 64 sq ft |
| Celsium Jonas Classic 4-Person Outdoor Sauna | 86.6" × 86.6" (2.2 × 2.2 m) | 85.0" × 85.0"; about 50 sq ft |
| Celsium Jonas Mini 2-Person Outdoor Sauna | 63.0" × 86.6" (1.6 × 2.2 m) | 85.0" × 60.4"; about 36 sq ft |
| Celsium Ula Mini 2-Person Outdoor Sauna | 47.2" × 78.7" (1.2 × 2.0 m), per Celsium's product sheet | 49" × 81"; about 27.6 sq ft |
| Celsium Ula Micro Compact 2-Person Outdoor Sauna | 39.4" × 39.4" (1.0 × 1.0 m), per Celsium's product sheet | 49.2" × 53.1"; about 18.1 sq ft |
The two Ula models rest on base runners within their foundation area: the Ula Mini's 49" × 81" body can overhang its base slightly, and on a minimum-size base the Ula Micro Compact's 49.2" × 53.1" body extends past the edges. How to build the foundation depends on your site, so ask a local contractor; our installation directory lists contractors near you. If the sauna will stand on a deck, patio, rooftop or other raised surface, that surface must carry the sauna's weight plus its bathers, and a qualified professional should check it before installation.
All five ship flat-packed: the Jonas models are delivered securely on pallets and the Ula models on a pallet. Celsium's product sheets list flat-pack pallet sizes of about 86.6" × 102.4" × 51.2" (2.2 × 2.6 × 1.3 m) for the Jonas Grand, 86.6" × 98.4" × 47.2" (2.2 × 2.5 × 1.2 m) for the Jonas Classic, 70.9" × 98.4" × 47.2" (1.8 × 2.5 × 1.2 m) for the Jonas Mini and 43.3" × 94.5" × 47.2" (1.10 × 2.40 × 1.20 m) for each Ula model. We confirm the shipping weight and pallet details with your quote.
Delivery is curbside, and liftgate service can be added so the carrier lowers the pallet to the ground. Moving the components from the curb to your site is up to you, so plan for helpers or equipment. Our Shipping Policy describes freight delivery in more detail.
Celsium doesn't publish an assembly time. The kit arrives with Celsium's step-by-step installation guidelines; you can assemble it yourself or hire a local contractor, and a licensed electrician connects the heater. We supply the sauna and coordinate its delivery, and installation is arranged locally. The indoor LED strip is installed on site.
Our guide to planning a Celsium outdoor sauna covers each of these steps in more detail. For the space around the sauna, including seating, changing space and where a cold plunge can go, see our backyard sauna setup guide.
Adding a Revive cold plunge
For hot-and-cold contrast sessions, pair a Celsium sauna with one of our cold plunges, and add robes and towels for the walk between them. The configurator on each Celsium product page can add a Revive cold plunge to the same request, so one reply prices both: the Revive Luxury Plunge, Revive Acrylic Plunge, Revive Inflatable Plunge, Revive Inflatable Barrel Plunge, Revive Inflatable Pod Plunge or Revive Inflatable Party Plunge, or "Not sure yet" if you would like us to suggest one. We confirm the fit for your space and your electrical service with the quote.
Each plunge needs a level surface rated for its filled weight plus the people using it; have a deck, balcony, rooftop or upper floor checked by a qualified professional before you fill it. Our Revive cold plunge buying guide compares the six, the Revive Cold Plunges collection lists them, and Contrast Therapy at Home covers alternating heat and cold, including who should check with a doctor first.
Warranty, pricing and buying
Celsium covers the structure of the Jonas Grand, Jonas Classic and Jonas Mini for 5 years and all other parts for 2 years. Celsium's US listings give the Ula Mini and the Ula Micro Compact a 2-year warranty. As an authorized Celsium dealer, we handle warranty support with you directly.
Frequently asked questions
Is a heater included with a Celsium sauna?
No. On all five, the heater is sold separately so it can be matched to your site and electrical service, and our specialists pair the heater, control and stones with your cabin and your electrical service. Celsium specifies at least 11 kW for the Jonas Grand and at least 9 kW for the Jonas Classic; Celsium's product sheets recommend 4.5 to 6 kW for the Jonas Mini, 6 kW for the Ula Mini and 3.5 to 4.5 kW for the Ula Micro Compact.
What electrical service does a Celsium sauna need?
That depends on the heater you choose. The heater is hardwired on a dedicated circuit, and a licensed electrician should size the breaker and wire to the heater's nameplate rating. You can find one through our installer and electrician directory.
Which of the five has the smallest footprint?
The Ula Micro Compact: 49.2" × 53.1", about 18.1 sq ft. Celsium's product sheet specifies a solid, level base of at least 39.4" × 39.4" (1.0 × 1.0 m); the cabin rests on base runners within that area, so on a minimum-size base its body extends past the edges. At 90.6", it stands taller than the Ula Mini, which is 83" tall on a 49" × 81" footprint.
What foundation does a Celsium sauna need?
Celsium specifies a solid, level base of at least 86.6" × 110.2" for the Jonas Grand, 86.6" × 86.6" for the Jonas Classic and 63.0" × 86.6" for the Jonas Mini; Celsium's product sheets give 47.2" × 78.7" for the Ula Mini and 39.4" × 39.4" for the Ula Micro Compact, whose cabins rest on base runners within those areas. Have it ready before delivery so the kit can be assembled straight onto it.
How long does assembly take?
Celsium doesn't publish an assembly time. The kit arrives with step-by-step installation guidelines, and you can hire a local contractor for assembly and a licensed electrician for the heater connection.
What warranty comes with a Celsium sauna?
Celsium covers the structure of the three Jonas models for 5 years and all other parts for 2 years. Celsium's US listings give the Ula Mini and the Ula Micro Compact a 2-year warranty. As an authorized Celsium dealer, we handle warranty support with you directly.
Which side is the door on?
On the Jonas models, the full-height glass door is on the left-hand side: facing the glass front, it's in the side wall on your left, at the end nearest the glass, and on the Jonas Grand it opens outward. On the Ula models, the door is at the center of the glass front. Some photos show the door elsewhere; images are for illustration purposes only.
Where are Celsium saunas made?
All five are handcrafted in Lithuania by Celsium. Celsium is a member of Sauna from Finland, the North American Sauna Society and the Australian Sauna Association.
Get pricing on a Celsium sauna
Tell us the model, the exterior color and where it will stand. We confirm your site, power supply and configuration, then send a delivered price with the heater pairing.
Request pricingBrowse all five in Celsium Saunas and the plunges in Revive Cold Plunges, or compare other brands in Outdoor Saunas and Traditional Saunas.
Celsium, ThermoWood®, Revive, Harvia and HUUM are trademarks of their respective owners. Sauna Republic is an authorized Celsium dealer. This article is for educational purposes and is not medical advice. If you are pregnant, managing a heart, blood-pressure or circulation condition, or taking medication, consult a healthcare professional before using a sauna or cold plunge, and follow the manufacturer's safety guidance.
