Context: the mild alternative to the full-spectrum Oslo
The Artsauna Oslo Triplex shares its name, dimensions and wood with the classic Artsauna Oslo, but takes a different path on the most important question: the type of heat. While the standard Oslo works with full-spectrum heaters and delivers the typical, intense direct warmth with reddish light, the Triplex variant relies on a heating system that puts mild panel warmth first. That is exactly why we list it in our comparison of the best infrared cabins for 2 people as a recommendation for those sensitive to heat. This data check looks at what makes the Triplex system distinctive and for whom it is the better choice.
On method: a data check is not a laboratory measurement, but an honest compilation of the documented manufacturer and retailer information, compared with documented user experiences and translated into a transparent editorial rating. We invent neither wattages nor daily prices. Whether mild radiant warmth suits you at all, or whether you want the classic sauna climate with steam infusions, is clarified beforehand by our fundamentals article Infrared cabin or sauna.
The data at a glance
The following key data comes from the product information of the manufacturer and retailer as of August 2026. Where the manufacturer gives no reliable figure, nothing is listed here, rather than filling a gap with an estimate.
| Key data | Information according to manufacturer/retailer |
|---|---|
| Type | Infrared cabin, compact two-person format |
| People | 2 |
| Footprint | 120 x 100 cm |
| Heating system | Triplex heating system, panel and back warmth |
| Control | digital |
| Light | LED colour light |
| Material | Hemlock wood |
| Connection | 230 V socket |
| Price range | Entry-level two-person |
| Editorial rating | 4,2/5 |
A word on the 120 x 100 format: this is the compact standard size of two-person cabins and makes the Oslo Triplex easy enough to place in a bedroom corner, bathroom or hobby room. When measuring, the usual rules of this design apply: a few centimetres of wall clearance for rear ventilation, free swing space for the glass door, and a socket within reach that does not already have a washing machine or dryer connected. It is delivered in prefabricated elements that fit through normal room doors and are screwed together at the installation spot; plan on two people and a quiet afternoon for this.
What makes the Triplex heating system distinctive
The core of this cabin is in the name. According to Artsauna, the Triplex heating system combines broad, mild panel warmth with targeted back warmth, instead of relying solely on the concentrated direct radiation of a pure full-spectrum front. The difference is clearly noticeable in everyday use: full-spectrum heaters feel like sun burning on the skin at one spot, with visible reddish light and high initial intensity. Panel warmth, by contrast, comes from large, mildly heated panels and surrounds the body more like an evenly warm wall. Anyone who has ever found pure full-spectrum too harsh will know the appeal of the gentler variant.
The targeted back warmth is more than a detail. The back is the part of the body where many people feel tension and cold most strongly, and a heater that acts exactly there makes the difference between merely warming up and genuine well-being. Together with the digital control, which lets you set temperature and run time directly in the cabin, the result is a predictable, repeatable warmth experience. The LED colour light rounds off the equipment and provides the relaxed atmosphere many associate with a warmth cabin.
Important for an honest assessment: milder does not mean weaker in the sense of ineffective, but different in character. Panel warmth usually needs a little more time to feel well-rounded, but rewards you with a more even, less intrusive heat profile across the whole session. Anyone who wants to understand the principle behind the different heater philosophies in detail will find the differences explained at length in our infrared cabin buying guide.
Strengths in everyday use
The Oslo Triplex's greatest strength is precisely its warmth character. For anyone who reacts to pure full-spectrum with discomfort, a mild panel-warmth cabin is often the difference between a purchase that gathers dust in the cellar and one that becomes a fixed after-work habit. The gentle warmth invites longer, calmer sessions and takes away beginners' fear of the first intense wave of heat. The Triplex thereby addresses an audience that the full-spectrum-heavy comparison tables on the web often overlook.
The second strength is the well-thought-out basic equipment at no extra cost. Digital control and LED colour light are included from the factory, so nothing has to be retrofitted or bought separately to have the complete wellness programme. The digital control is more than a convenience: anyone who can set temperature and time exactly finds their own comfort curve faster and does not have to feel their way again at every session. This is especially valuable for mild panel warmth, which depends more on the right pre-heating and dwell time than the immediately intense full-spectrum front.
The third plus point is the everyday practicality of the compact format. At 120 x 100 centimetres, the Oslo Triplex fits into rooms where a full-size family cabin would have no chance, and operation on a standard household 230-volt socket makes an electrician unnecessary. A dedicated, adequately fused circuit is enough. Because relaxation is the real reason to buy: what regular warmth sessions can mean for well-being and where the limits lie is put into sober context by our article Is sauna healthy?.
Honest limits
The first limit is the same as with any compact two-person cabin: space. On 120 x 100 centimetres, two adults sit tightly side by side, with shoulder contact and little room to move. For a relaxed sauna session for two, the format is borderline, while for one person it is generous. Anyone who regularly wants to sweat as a pair with real side-by-side space is better served by a wider format such as the 140 class; our data check of the Dewello Hyder and the comparison of two-person cabins show the alternatives.
The second remark concerns exactly what makes the Triplex what it is: anyone looking for intense, immediately noticeable full-spectrum direct warmth is deliberately in the wrong place here. The mild panel warmth is a matter of taste, and anyone who loves the strong sun-on-the-skin feeling will go for the classic full-spectrum Oslo or straight to one of the stronger cabins from our comparison of the best full-spectrum infrared cabins. The Triplex approach is a deliberate choice for gentleness, not a compromise born of weakness, but it is not right for everyone.
And finally, the usual honest note on assembly and the data situation: the cabin arrives in packages and has to be screwed together at the installation spot, and a narrow stairwell can become a bottleneck. In addition, Artsauna is reticent about exact output figures for the Triplex system; we deliberately do not add an invented wattage, but state only what is documented. Anyone who needs a specific heating output for planning should ask the retailer for the exact figure before buying.
Who it is worth it for, and the alternatives
The Oslo Triplex is worthwhile above all for two groups: people sensitive to heat, for whom pure full-spectrum is too intense, and solo users who want a compact cabin with gentle, even warmth and complete basic equipment. Anyone in these groups gets a well-rounded package of mild panel warmth, digital control and colour light at an entry-level price, without paying extra for add-ons. Even for couples who prefer to sauna calmly and for long rather than short and hot, the Triplex's warmth character is often the more pleasant choice.
Two alternatives for other priorities: anyone who wants intense direct warmth sticks with the classic Artsauna Oslo with full-spectrum heaters, which is our favourite of the compact two-person class. Anyone who wants gentle warmth but more space and a complete multimedia package will find a well-equipped compact cabin in the Dewello Hyder. Anyone still torn between sizes and technologies will find the overview in our buying guide for two-person cabins helpful for an honest seating forecast.
As a rule of thumb from the editorial team: decide by how you feel heat, not by the data sheet. If you know that pure full-spectrum is too much for you, the Triplex is a smart and often underrated choice. If, on the other hand, you plan to use the cabin almost only as a two-person unit, check honestly whether the compact 120 format is really enough. What running it costs over a year is worked out in our article on the power consumption of saunas and infrared cabins.
How we assessed
Our editorial rating weighs four criteria: the heating technology (system, layout and character), the build quality of wood, glass and bench, the features from the controls through the colour light to ease of use, and everyday practicality in terms of dimensions, connection and assembly effort. The basis is manufacturer and retailer information as well as documented user experiences, not our own laboratory measurements, and that is exactly how we label it. For the Oslo Triplex, the distinctive, mild heat character and the complete standard equipment count towards the rating, while the tight two-person format and the reserved power specification mean small deductions. You will not find invented test results or fantasy prices here.
An honest note on health: infrared heat relaxes muscles and circulation in a mild way, but does not replace medical treatment. In the case of cardiovascular disease, pregnancy or acute infections, the question of whether and how you should sweat belongs first in a doctor's consultation.
Verdict: editorial rating 4.2 out of 5
That leaves the overall tally, and it is a friendly one. The Artsauna Oslo Triplex fills a niche that many comparisons forget: mild, well-tolerated heat for everyone who finds pure full-spectrum too intense. With its surface-plus-back system, digital controls and LED colour light, it offers a coherent package at an entry-level price that leaves nothing to be desired after assembly. That two people sit tightly on the compact 120 format and that Artsauna does not state the heating output clearly are the honest drawbacks. All in all, we give it an editorial rating of 4.2 out of 5, based on the documented data and the market comparison; how our ratings come about is explained on the page about our editorial team.
Artsauna Oslo Triplex
- Mild, large-area heat with targeted back warmth: the recommendation for the heat-sensitive
- Digital controls and LED colour light from the factory, no retrofitting needed
- Compact 120 x 100 format and operation on a normal 230-volt socket
- Two people sit tightly, and anyone looking for intense full-spectrum direct heat should go for the sister variant