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Introducing the Leil® Celto M Outdoor 3-4 Person Cabin Sauna — from a distinguished sauna manufacturer hailing from Estonia, renowned for over 15 years of unparalleled expertise in production.
The Leil® Celto series brings solid cross-laminated timber construction to a genuinely accessible price point, and the Celto M is where that approach hits its stride. An additional 15 inches of interior width over the Celto S transforms the bathing experience: the upper bench runs a full 73 inches, long enough to lie down on, and a dedicated corner step opens up the lower level for a second seating position.
Where most saunas in this category rely on thin panelling over a stud frame, the Celto M is built from 60mm solid CLT spruce panels — the same structural material used in contemporary timber architecture. The result is a cabin with real thermal mass and structural rigidity, not a clad box. Floor-to-ceiling bronze glazing across the front elevation keeps the interior open to the landscape, while concealed LED backlighting behind the backrest washes the rear wall in warm indirect light.
Because the Celto M arrives as a set of pre-manufactured CLT panels rather than hundreds of individual components, assembly is measured in hours rather than days. Two people, basic tools, and a level pad are all that is required — no framing, no separate insulation layer, no interior cladding to install.
Features:
WALLS Constructed from 2.4" (60mm) solid cross-laminated timber panels in natural spruce, delivering structural rigidity and thermal mass in a single element — no framing, no separate insulation layer, no interior cladding required.
ROOF Comprised of four solid CLT roof panels finished with a fully adhered EPDM membrane for long-term weather protection, with covering slats sealed along the entire perimeter against water ingress.
FLOOR Engineered from solid CLT floor panels mounted on treated timber bearers, raising the cabin off the ground for ventilation and moisture management beneath the structure.
DOOR A 72.8" x 22.8" (1850 x 580mm) door with 8mm tempered bronze glass, hinged within a solid CLT frame for a seamless transition into the sanctuary of relaxation.
GLAZING Four panels of 8mm tempered bronze glass measuring 70.7" x 22" (1795 x 560mm), set into the front elevation with aluminum retaining profiles for a full-width panoramic outlook.
BENCHES Two-level bench configuration with a 73.2" (1860mm) run across the upper and lower tiers, a full-width backrest above the upper bench, and a dedicated 15.7" x 18.5" (400 x 470mm) corner step for easy access to the upper level.
LIGHTING Optional LED set mounted behind the backrest, casting indirect warm light across the rear wall. Includes LED strip, cable, transformer, dimmer switch, and installation box.
VENTILATION Complete two-point ventilation system with a lower intake and an adjustable upper exhaust, both fitted with exterior grilles for controlled airflow through the sauna room.
HEATER STAND A purpose-designed heater stand developed specifically for the Celto series, engineered to accept both HUUM Drop and Harvia KIP heaters.
Indulge in the epitome of outdoor bathing with the Leil® Celto M — where solid timber construction meets genuine accessibility.
Specifications:
- Capacity: 3-4 people
- Room: 1
- Construction: 2.4" (60mm) solid CLT spruce panels
- Exterior Finish: Natural spruce, untreated
- Exterior Dimensions:
- Height: 82.7" (2100mm)
- Width: 79.4" (2016mm)
- Depth: 55" (1396mm)
- Sauna Room Dimensions: 73.2" x 48.8" (1860 x 1240mm)
- Interior Height: 74.8" (1900mm)
- Door: 72.8" x 22.8" (1850 x 580mm), 8mm tempered bronze glass
- Roof: EPDM membrane over solid CLT panels
- Crate Dimensions: REPLACE_CRATE_DIMENSIONS
- Assembly Time: Approximately 4 hours (2 people)
- Warranty: 1 year
- Weight: REPLACE_WEIGHT
Compatible Heaters:
The Celto M is engineered around a 74.8" (1900mm) internal height, which requires a compact-format heater. The following units are confirmed compatible and mount directly to the included Leil heater stand:
- HUUM DROP 7 kW
- HUUM DROP 9 kW
- Harvia KIP 8 kW
Taller heater formats are not suitable for this cabin. Our team can confirm the right pairing for your climate and usage pattern — call or text us before ordering.
Natural Wood Character:
The Celto M is built from natural, untreated spruce. This is a living material, and two characteristics are entirely normal and expected across the lifespan of the sauna:
- Surface checking: Fine cracks may appear along the panel faces as the timber responds to seasonal humidity and temperature cycles. This is inherent to solid wood and does not affect the structural integrity of a CLT panel.
- Resin bleed: Spruce contains natural resin, and small amounts of sap may weep from knots and grain, particularly during the first heating cycles. This can be removed with a plastic scraper once cooled, or simply left to crystallize.
Neither is a defect. Both are the signature of solid, natural timber rather than engineered composite panelling. We recommend applying a quality exterior weatherproof finish to the outer surfaces after assembly to protect against moisture, UV, and temperature swings.
Set Includes:
- Cabin (pre-manufactured CLT panel set)
- Two-level benches, backrest, and corner step
- Ventilation set (upper and lower)
- Heater stand (HUUM Drop & Harvia KIP compatible)
- EPDM roof membrane
- Installation drawings
- Hardware


