🌲 Quadro Fasssauna 4.5×2.3 m Barrel Sauna by Thermowood Production: Expert Review 2026 | Thermowood, Package Contents, Price, Installation.

🔍 Why the Quadro Fasssauna 4.5×2.3 m is an engineered solution, not just a "sauna made of planks"

The Quadro Barrel combines the aerodynamic stability of a classic round design with the maximum usable volume of a square section. The Quadro Fasssauna 4.5 x 2.3 m model from Thermowood Production is designed for those seeking durability, energy efficiency, and aesthetics without the hassle of middlemen.

By ordering directly from a full-cycle manufacturer, you receive:

• ✅ Save 15–20% due to the absence of dealer markups
• ✅ Direct quality control at every stage: from wood drying to final electrical testing
• ✅ Opportunity to visit the production facility in Zhytomyr to see first-hand the 215°C thermal modification technology and the assembly of the structure

This review provides a detailed analysis of materials, engineering, safety, cost and operating conditions, based on actual plant specifications.

📊 Technical specifications of the Quadro Fasssauna 4.5×2.3 m

🌲 Material and Processing – Why 215°C Thermally Modified Wood is a Game Changer

🔬 Thermal modification technology

The wood is processed at 215°C in an oxygen-free environment. This results in:

• Hemicellulose breakdown → water absorption drops from 12–18% to 3–5%
• Crystallization of lignin → the cell wall becomes rigid and resistant to deformation
• Extraction of nutrients for insects and fungi → rot resistance class 1 (highest EN 350)

🛡️ Tikkurila coating

• Outside : Permeable impregnation + weather-resistant varnish → protection from UV, precipitation, temperature changes
• Inside : Natural sauna oil → hypoallergenic, does not release toxins when heated, emphasizes the texture of the wood.
• Advantage : No annual sanding or repainting required. Basic maintenance every 3-5 years is sufficient.

🛋️ Planning, comfort and engineering

💡 Engineering note : The square shape reduces wind load by 30% compared to rectangular modules, while maintaining 90% of the usable interior space. This is the optimal balance between aerodynamics and comfort.

🔒 Safety and fire protection

🛡️ Important : The base price of €6,760 does not include the stove . The wood-burning stove is selected individually based on the room's power (6–9 kW recommended for a steam room of ~12–14 m³).

💰 Transparent pricing and optional equipment

📌 Final formula :
Base (€6,760) + Selected options + Oven + Delivery/Installation = Final turnkey price
. All prices are fixed, with no hidden fees. The manufacturer provides detailed specifications upon signing the contract.

⚖️ Expert Table "Advantages and Nuances"

❓ FAQ — Engineer's Answers

❓ Is a Quadro 4.5×2.3 m foundation required?

Yes, but a major overhaul isn't necessary. Optimally:

• Screw piles (4–6 pcs.) or FBS concrete blocks
• A level area with a sand and gravel cushion
• Distance from ground to bottom trim: ≥15cm for ventilation

❓ Is it possible to use a sauna in winter?

Yes. Thermowood is stable at temperatures from -30°C to +40°C. Recommendations:

• Heat the oven gradually (at minimum for the first 15 minutes)
• Check the tightness of windows and doors before the season
• Install additional thermal insulation for floors if used continuously in winter.

❓ What's included in the "basic package for €6,760"?

• ✅ Thermowood frame
• ✅ Exterior and interior cladding, finishing Tikkurila
• ✅ Hallway 1,870 mm + additional partition/door
• ✅ LED lighting (under benches + wall lights)
• ✅ Fire protection (Superizol, stainless steel overlay, MasterFlash)
• ✅ Turnkey windows and locks

❌ Oven, stones, external electrical wiring, delivery, foundation installation

❓ Is it possible to order custom options?

Yes. The manufacturer offers:

• Changing the location of windows/doors
• Additional insulation (100 mm basalt wool + foil)
• Improved ventilation (100mm Ø valves)
• Outdoor LED facade lighting

❓ How to visit the production facility?

Book by phone or messenger. We offer tours daily (by prior arrangement). You'll see:

• Drying and thermal modification chambers
• Assembling frames under controlled conditions
• Electrical and fire testing
• Ready-made warehouses and packaging line

📋 Step-by-step ordering process

1. Consultation (1 day) → Clarification of dimensions, options, furnace selection
2. Contract and 30% advance payment (2–3 days) → Price fixed in €, production launch
3. Production (3-5 weeks) → Photo/video reports weekly, quality control
4. Final testing and packaging (2 days) → Electrical, fire safety, and air tightness testing
5. Delivery and installation (1–3 days depending on the region) → Manipulator, installation on the foundation, connection of utilities
6. Warranty and support → 5 years for the structure, 2 years for electrical parts/hardware

🎯 Final Conclusion: Why the Quadro Fasssauna 4.5×2.3 m is an investment in durability

"Buying directly from the manufacturer isn't about saving money. It's an investment in control, quality, and transparency.

Quadro Fasssauna 4,5×2,3 м от Thermowood Production.

• ✅ Thermowood 215°C — stability, no rot, zero shrinkage
• ✅ Engineering safety - full fire protection, certified electricity, moisture-resistant materials
• ✅ User comfort – spacious entrance hall, ergonomic benches, LED lighting, panoramic windows
• ✅ Transparent price — €6,760 per database, no hidden fees, saving 15–20% off the market
• ✅ Full production cycle – from wood drying to final testing. We invite you to the factory!

🏆 Expert verdict : If you're looking for a sauna that will last 25-40 years without major repairs, doesn't require annual maintenance, and guarantees the safety of your family, the Quadro Fasssauna from Thermowood Production is the optimal choice in its segment.

📞 Contact us for orders and consultations

• 🔹 Phone / WhatsApp / Viber / Telegram : + 38067 201 50 50
• 🔹 Email : info@thermowood-production.de
• 🔹 Website : lestorg.org.ua | thermowood-production.de

📩 Write "QUADRO 4.5" on WhatsApp - and receive in 24 hours:

• ✅ Detailed 3D visualization and drawing of support points
• ✅ Personalized cost estimate including delivery and installation
• ✅ Catalog of stoves and accessories with engineer recommendations
• ✅ Production schedule and warranty conditions

🎁 Bonus with your order : Free site preparation consultation with an engineer + a free basic care kit for thermally modified wood!

🌐 We are on social networks:

• 🔸 Instagram: @thermowoodproduction
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• 🔸 YouTube: ThermowoodProduction
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• 🔸 LinkedIn : Thermally Modified Wood Production