♨️ Harvia Cilindro 20 Steel Wood-Burning Sauna Stove

17 kW Finnish craftsmanship meets modern design – powerful wood-fired heating for saunas up to 20 m³

🔥 Product Overview

The Harvia Cilindro 20 Steel represents the pinnacle of contemporary wood-burning sauna technology, delivering commanding 17 kW heat output for larger sauna spaces from 8 to 20 m³. This striking pillar-style stove combines the primal appeal of wood-fired heating with sophisticated Finnish engineering, creating an unforgettable sauna experience.

Designed and manufactured in Muurame, Finland, the Cilindro 20 features a robust stainless steel exterior that ensures exceptionally quiet operation while resisting the demanding sauna environment. The substantial 120 kg stone capacity generates magnificent steam production – the soft, enveloping löyly that defines authentic Finnish sauna culture.

What sets the Cilindro 20 apart is its innovative rear ventilation duct system, engineered to accelerate heat distribution and dramatically reduce warm-up times. The elegant glass door transforms your sauna into a visual sanctuary, casting dancing firelight across the room while allowing effortless fire management. User-replaceable air control plates within the firebox ensure decades of reliable service. For discerning sauna enthusiasts who demand both aesthetic excellence and serious heating performance, the Harvia Cilindro 20 Steel delivers without compromise.

💫 Key Features

✅ 17 kW Heat Output – Commanding wood-burning power for sauna rooms from 8 to 20 m³

✅ 120 kg Stone Capacity – Exceptional stone mass delivers superior heat retention and luxurious steam

✅ Stainless Steel Exterior – Premium finish ensures quiet operation and lasting durability

✅ Glass Fire-Viewing Door – Creates captivating ambiance with mesmerising flame visibility

✅ Rear Ventilation Duct System – Innovative design accelerates heat-up and optimises air circulation

✅ Replaceable Air Control Plates – Serviceable internal components for extended stove lifespan

✅ Dual Flue Connection Options – Back or top chimney connection suits various installation layouts

✅ Adjustable Legs Included – Enables precise levelling on uneven surfaces

✅ Flue Gas Heat Regulator – Fine-tune combustion efficiency and heat output

✅ Finnish Design & Manufacturing – Proudly crafted in Muurame, Finland with Key Flag certification

✅ CE Certified – Full compliance with European safety and quality standards

⚙️ Technical Specifications

Specification	Value
Model	WKPC20S
GTIN	6417659043328
Heat Output	17 kW
Fuel Type	Wood
Sauna Room Size	8–20 m³
Dimensions (H×W×D)	773 × 557 × 557 mm
Net Weight	62 kg
Gross Weight	65 kg
Stone Capacity	120 kg
Recommended Stone Size	Ø10–15 cm
Main Material	Stainless Steel
Chimney Connection Diameter	Ø115 mm
Flue Connection Locations	Back or Top
Minimum Room Height	1900 mm
Certification	CE
Country of Manufacture	Finland

Package Dimensions

Dimension	Value
Package Width	580 mm
Package Height	810 mm
Package Depth	580 mm

🏠 Room Sizing Guide

Recommended Room Size: 8–20 m³

Adjustment Factors for Wood-Burning Stoves

Condition	Adjustment
Glass door/windows	Add 1.2–1.5 m³ per m² of glass
Uninsulated surfaces (brick, concrete)	Add 1.2 m³ per m²
Log/timber walls	Multiply total volume by 1.5
High ceiling (above 2.3m)	Add additional volume

Worked Examples

📍 Standard Home Sauna: 2.5m × 2.2m × 2.3m

• Base volume: 12.65 m³
• Glass door (0.8m × 2.0m = 1.6 m²): +2.0 m³
• Total calculated: 14.65 m³
• This 17 kW stove: ✅ Ideal fit within 8–20 m³ range

📍 Large Garden Cabin: 3.0m × 2.5m × 2.4m

• Base volume: 18.0 m³
• Glass window (1.0 m²): +1.2 m³
• Total calculated: 19.2 m³
• This 17 kW stove: ✅ Suitable

📍 Log Cabin Sauna: 2.2m × 2.0m × 2.2m

• Base volume: 9.68 m³
• Log wall multiplier: × 1.5 = 14.52 m³
• This 17 kW stove: ✅ Excellent match

🔒 Safety Clearances

Clearances from Combustible Materials

Position	Minimum Distance
Front	500 mm
Right Side	150 mm
Left Side	150 mm
Back/Behind	200 mm
Ceiling	1000 mm

Clearances from Non-Combustible Materials

Position	Minimum Distance
Front	500 mm
Right Side	100 mm
Left Side	100 mm
Back/Behind	100 mm

Installation Opening Requirements

Dimension	Value
Opening Height	1770 mm
Opening Width	857 mm
Opening Depth	1257 mm
Minimum Room Height	1900 mm

⚠️ IMPORTANT: Installation must comply with local building regulations and fire safety codes.
A qualified installer should assess chimney requirements and ensure proper ventilation.
All clearances must be strictly observed to prevent fire hazards.

🛠️ Installation Requirements

Chimney/Flue Requirements

Requirement	Specification
Chimney Diameter	Ø115 mm
Connection Options	Back or Top
Chimney Type	Class A insulated chimney recommended

Ventilation

• Fresh air intake required near floor level for combustion
• Exhaust ventilation positioned appropriately for air circulation
• Adequate combustion air supply essential for efficient, clean burning

Floor Protection

• Non-combustible hearth required beneath and in front of stove
• Extend hearth minimum 300 mm in front of loading door
• Heat-resistant materials: natural stone, ceramic tile, or sheet metal on cement board

General Requirements

• Professional installation strongly recommended
• Building regulations approval may be required
• Chimney sweep inspection before first use
• Carbon monoxide detector installation recommended
• Regular ash removal and chimney maintenance essential

🪨 Sauna Stones

Specification	Value
Capacity	120 kg
Recommended Stone Size	Ø10–15 cm diameter
Stones Included	No – sold separately

Recommended Stone Types

• ✅ Olivine diabase
• ✅ Peridotite
• ✅ Vulcanite
• ✅ Dense igneous rocks

Stone Installation Guidelines

• Use larger stones (10–15 cm) designed for wood-burning stoves
• Pack stones loosely to allow proper air circulation around the firebox
• Ensure stones do not obstruct ventilation paths
• Leave adequate space between stones for heat convection and steam generation

Maintenance Schedule

• Inspect stones annually for cracks and deterioration
• Replace damaged, crumbling, or fractured stones promptly
• Rearrange stone arrangement periodically to ensure even heating
• Remove ash and debris from stone compartment after each use

🎯 Ideal Applications

Application	Room Size	Capacity	Notes
🏠 Large Home Sauna	8–20 m³	4–8 people	Spacious family installations
🛖 Garden Sauna Building	10–18 m³	6–8 people	Purpose-built outdoor structures
🪵 Log Cabin Sauna	8–14 m³	4–6 people	Traditional wood-on-wood aesthetic
🏕️ Off-Grid Retreat	8–20 m³	4–8 people	Remote locations without electricity
🏋️ Sports Club Sauna	12–20 m³	6–10 people	High-usage environments

🔥 Wood-Burning vs Electric: Why Choose Wood?

Advantages of Wood-Burning Sauna Stoves

Benefit	Description
Authentic Ritual	Traditional Finnish sauna ceremony with fire-building tradition
Energy Independence	No electricity required – ideal for off-grid and garden installations
Superior Löyly Quality	Larger stone mass and radiant heat create softer, more enveloping steam
Atmospheric Excellence	Crackling fire sounds and warm glow through glass door
Economical Operation	Wood fuel often more affordable than electricity, especially with own supply
Power Resilience	Unaffected by power outages or electricity price fluctuations

Considerations

• Requires chimney installation and building regulations compliance
• Manual fire management and fuel preparation needed
• Longer heat-up time (typically 45–90 minutes depending on conditions)
• Regular ash removal and annual chimney sweeping required

❓ Frequently Asked Questions

Q: What size sauna room is this stove suitable for? A: This 17 kW wood-burning stove is designed for sauna rooms between 8 and 20 m³. For rooms with glass surfaces or uninsulated walls, add approximately 1.2 m³ per m² of non-insulated area to your volume calculation.

Q: How long does it take to heat the sauna? A: Typically 45–90 minutes depending on room size, insulation quality, outdoor temperature, and wood quality. The innovative rear ventilation duct helps accelerate heat-up compared to conventional designs.

Q: What type of wood should I use? A: Use well-seasoned hardwood (birch, oak, ash, beech) with moisture content below 20%. Avoid softwoods like pine or spruce which produce excessive creosote, resinous smoke, and faster tar build-up in the chimney.

Q: Are sauna stones included? A: No, stones are sold separately. This stove requires 120 kg of sauna stones, Ø10–15 cm diameter. Use only recommended stone types rated for high-temperature wood-burning applications.

Q: What chimney specification do I need? A: A Class A twin-wall insulated chimney with Ø115 mm diameter is recommended. The stove offers both back and top flue connection options for installation flexibility. Always consult a qualified installer.

Q: Do I need planning permission or building regulations approval? A: Chimney installations typically require building regulations approval in the UK. Check with your local authority. Using a HETAS-registered installer ensures compliance and may satisfy regulations.

Q: What maintenance is required? A: Regular ash removal after each use, annual chimney sweeping by a qualified sweep, periodic stone inspection and replacement, and occasional glass door cleaning. Replace worn or damaged spare parts as needed.

Q: How does this compare to the Cilindro 16? A: The Cilindro 20 offers 17 kW output (vs 16 kW) and handles larger rooms up to 20 m³ (vs 13 m³). It’s taller (773mm vs 750mm), heavier (62 kg vs 54 kg), and includes additional accessories such as adjustable legs and flue gas heat regulator.

📄 Downloads & Resources

📄 Product Datasheet (PDF) – Complete specifications and technical details

🏆 Why Choose Harvia Cilindro 20 Steel

• ✅ Powerful 17 kW Performance – Efficiently heats larger saunas up to 20 m³
• ✅ Authentic Finnish Engineering – Designed and manufactured in Muurame, Finland
• ✅ Exceptional Steam Quality – 120 kg stone capacity produces soft, luxurious löyly
• ✅ Contemporary Pillar Design – Striking stainless steel aesthetic with glass fire-viewing door
• ✅ Innovative Heat Distribution – Rear ventilation duct accelerates warm-up times
• ✅ Complete Accessory Package – Comprehensive kit includes levelling legs, heat regulator, and all installation components

🤝 Why Buy from Parts4Tubs

• ✅ UK-based company with local customer support
• ✅ Fast UK delivery
• ✅ Expert advice from sauna specialists
• ✅ Competitive pricing
• ✅ Full warranty support
• ✅ Easy returns within 30 days

✨ Summary

The Harvia Cilindro 20 Steel wood-burning sauna stove delivers commanding 17 kW heating performance for larger sauna rooms from 8 to 20 m³. Featuring a striking stainless steel pillar design, 120 kg stone capacity for exceptional löyly, and an innovative rear ventilation duct for rapid heat distribution, this Finnish-crafted stove transforms any space into an authentic wood-fired sanctuary. The integrated glass door creates mesmerising fire-glow ambiance, while replaceable air control plates and included flue gas heat regulator ensure decades of reliable service. Complete with adjustable legs, ash tray, and full installation accessories, the Cilindro 20 is the definitive choice for serious sauna enthusiasts. Order from Parts4Tubs for fast UK delivery and expert support.