🌡️ Harvia The Wall SW80 8.0kW Black Steel Sauna Heater – 7-12 m³ Capacity

Scandinavian minimalism meets powerful performance – the compact wall-mounted heater that transforms medium-sized saunas into authentic Finnish wellness retreats

♨️ Product Overview

The Harvia The Wall SW80 represents the pinnacle of Finnish sauna engineering, delivering 8.0kW of heating power in a remarkably compact wall-mounted design. Crafted in Finland by Harvia – a company with over 75 years of sauna expertise – this Black Steel heater combines minimalistic Scandinavian aesthetics with robust functionality.

Designed specifically for medium-sized sauna rooms between 7-12 m³, The Wall SW80 features an innovative compact form that maximises space while maintaining exceptional heating performance. The distinctive black steel finish provides a contemporary touch that complements modern sauna interiors, whilst the illuminated control switches ensure effortless operation even in low-light conditions.

What sets The Wall apart is its versatile installation options – configure the control panel on either left or right side to suit your sauna layout, or integrate the heater directly into your sauna bench for a seamless appearance. Extra-long heating elements and intelligent airflow design guarantee steady, consistent warmth throughout your sauna session.

⭐ Key Features

✅ 8.0kW Power Output – Powerful heating capacity ideal for medium-sized sauna rooms from 7-12 m³, ensuring rapid heat-up times and consistent temperatures

✅ Premium Black Steel Construction – Stylish matt black finish provides a modern, sophisticated appearance whilst offering excellent durability and corrosion resistance

✅ Illuminated Control Switches – Easy-to-use backlit timer and thermostat controls for convenient operation in low-light sauna environments

✅ Flexible Installation Design – Control panel can be configured on left or right side; heater can also be integrated within sauna bench structure

✅ Extra-Long Heating Elements – Specially designed elements with dedicated support structure transfer heat more smoothly and provide extended service life

✅ 20kg Stone Capacity – Generous stone reservoir for excellent steam (löyly) production and heat retention

✅ Smart Airflow Design – Optimised internal structure promotes efficient air circulation for even temperature distribution throughout the sauna room

✅ Built-In Safety Protection – Thermal cut-out and overheat protection systems for safe, worry-free operation

✅ CE Certified – Fully compliant with European safety standards for electrical equipment

✅ 2-Year Warranty – Comprehensive manufacturer warranty for domestic/family use installations

✅ Finnish Quality – Designed, engineered and manufactured in Finland by Harvia, the world’s leading sauna manufacturer

🔧 Technical Specifications

Specification	Value
Model Number	HSW800400M (SW80)
Power Rating	8.0 kW
Voltage Options	230V 1N~, 230V 3~, 400V 3N~
Electrical Frequency	50/60 Hz
Fuse (400V 3N~)	3 × 16 A
Fuse (230V 1N~)	50 A
Fuse (230V 3~)	3 × 25 A
Supply Cable (400V 3N~)	5 × 2.5 mm²
Supply Cable (230V 1N~)	3 × 6 mm²
Room Capacity	7-12 m³
Dimensions (H × W × D)	700 × 430 × 260 mm
Net Weight	13.6 kg
Stone Capacity	20 kg
Stone Size	Ø 5-10 cm
Timer Range	1-4 hours (with 0-8 hour preset option)
IP Rating	IPX4 (splash-proof)
Certifications	CE, EAC
Mounting	Wall
Control Type	Built-in illuminated switches
Material	Steel (Black Steel finish)
Warranty	2 years (domestic use)

📐 Room Sizing Guide

Basic Formula:

1 kW of heater power = approximately 1-1.5 m³ of well-insulated sauna room

The Harvia SW80 8.0kW is suitable for rooms between 7-12 m³

Adjustment Factors

Condition	Adjustment
Glass door/windows	Add +1.2 m³ per m² of glass surface
Uninsulated or log walls	Add +50% to calculated volume
Outdoor/barrel sauna	Add +25-30% to calculated volume
High ceiling (above 2.3m)	Add additional volume compensation
Concrete/tile/brick surfaces	Add +1.2 m³ per m² of exposed surface

Worked Example

📍 Example Room: 2.5m × 2.0m × 2.2m

• Base volume: 11.0 m³
• Glass door (0.8m × 2.0m = 1.6 m²): +1.92 m³
• Total effective volume: 12.92 m³
• Harvia SW80 8.0kW: ✅ Suitable (rated for 7-12 m³, borderline – consider adding extra insulation)

📍 Ideal Installation: 2.0m × 1.8m × 2.2m

• Base volume: 7.92 m³
• Glass door (1.6 m²): +1.92 m³
• Total effective volume: 9.84 m³
• Harvia SW80 8.0kW: ✅ Perfect fit within 7-12 m³ range

💷 Running Costs

Energy Rate Used: £0.2635/kWh (UK Ofgem Price Cap Q4 2025 – Direct Debit average)

Annual Cost Estimates

Usage Level	Sessions/Week	Avg Session	Hours/Year	Annual Cost
🏠 Light Use	2	1.5 hrs	156 hours	£329
🏠 Regular Use	3-4	1.5 hrs	260 hours	£548
🧖 Heavy Use	6+	1.5 hrs	468 hours	£987

Calculation Formula

Annual Cost = Power (kW) × Hours per Year × Electricity Rate (£/kWh)

Example (Regular Use):
8.0 kW × 260 hours × £0.2635 = £548.08 per year

Per Session Cost (1.5 hour session):
8.0 kW × 1.5 hours × £0.2635 = £3.16 per session

💡 Cost Comparison: A typical 1.5-hour sauna session costs approximately £3.16 – comparable to a medium takeaway coffee!

⚠️ Actual costs depend on usage patterns, session duration, room insulation, and current energy rates. The heater does not run continuously at full power – it cycles on/off to maintain set temperature.

⚡ Installation Requirements

Electrical Requirements

Requirement	400V 3-Phase	230V Single Phase
Voltage	400V 3N~	230V 1N~
Circuit Breaker	3 × 16 A	50 A
Cable Size	5 × 2.5 mm²	3 × 6 mm²
Dedicated Circuit	✅ Required	✅ Required
RCD Protection	❌ Not recommended	❌ Not recommended

Cable Type: H07RN-F rubber cable or equivalent heat-resistant cable required. PVC-insulated cables are prohibited due to heat sensitivity.

Minimum Clearances

Position	Distance
Front (combustible materials)	30 mm
Front (non-combustible materials)	70 mm
Side walls (left & right)	70 mm
Ceiling	1,200 mm
Floor (via mounting bracket)	80 mm
Minimum room height	1,900-2,000 mm

Ventilation Requirements

• Fresh air intake: Position near or below heater, Ø 50-100 mm
• Exhaust vent: Position low on opposite wall, approximately twice diameter of intake
• Air changes: Sauna room air should change 6 times per hour

⚠️ IMPORTANT: Installation must be carried out by a qualified electrician 
in accordance with BS 7671 (IET Wiring Regulations) and local building codes.
Only one electric heater may be installed per sauna room.

🛡️ Safety Features & Certifications

Built-in Safety Systems

✅ Thermal Cut-Out Protection – Automatically shuts off heater if unsafe temperatures are detected

✅ Overheat Protection – Secondary safety system prevents overheating; can be reset after activation (see manual)

✅ Auto-Shutoff Timer – Maximum 4-hour continuous operation with 8-hour preset delay option

✅ IPX4 Splash Protection – Rated for wet sauna environments

✅ Element Support Structure – Protects heating elements from damage and prevents warping

Certifications

✅ CE Marked – Complies with European health, safety, and environmental protection standards

✅ EAC Certified – Eurasian Conformity certification

🎯 Ideal Applications

Application	Recommended Room Size	Typical Capacity	Notes
🏠 Home Sauna	7-10 m³	2-4 people	Perfect for residential installations
🛖 Garden Sauna	8-11 m³ (adjusted)	3-4 people	Account for outdoor temperature loss
🪵 Barrel Sauna	7-9 m³ (adjusted)	2-4 people	Compact power for cylindrical rooms
🏋️ Home Gym Sauna	7-12 m³	2-4 people	Post-workout recovery space
🏨 Small Spa	8-12 m³	3-5 people	Boutique wellness facilities

🪨 Sauna Stones

• Stone Capacity: 20 kg maximum
• Recommended Stone Size: Ø 5-10 cm diameter
• Stones Included: No – sauna stones sold separately
• Recommended Types: Peridotite, olivine diabase, or olivine (volcanic rocks designed for sauna use)
• Maintenance: Restack stones annually; replace damaged or crumbling stones
• Important: Never use ceramic “stones” or soft soapstone – these do not retain sufficient heat and may damage elements

💡 Tip: Always rinse stones before initial use to remove dust and debris. Stack loosely to allow proper airflow between stones.

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🎛️ Control Options & Accessories

Built-in Control System

• Timer Control: 1-4 hours direct operation, or 0-8 hours preset delay start
• Thermostat: Adjustable temperature control
• Illuminated Switches: Backlit for easy operation in low light
• Left/Right Configuration: Control panel can be installed on either side

Compatible Accessories

Accessory	Model/Description
Sauna Stones	20kg high-quality sauna stones (required, sold separately)
Safety Rail	Harvia safety guard rails available
Mounting Bracket	Included with heater

❓ Frequently Asked Questions

Q: What size room will this heater work for? A: The Harvia SW80 8.0kW heater is designed for well-insulated sauna rooms between 7-12 m³. For rooms with glass doors, uninsulated walls, or log construction, add 25-50% to your volume calculation.

Q: How long does it take to heat up? A: A properly insulated sauna room typically reaches optimal bathing temperature (65-80°C) within approximately 45-60 minutes, depending on room size, insulation quality, and ambient temperature.

Q: What electrical supply do I need? A: This heater can be connected to either 400V 3-phase (3 × 16A) or 230V single-phase (50A) supply. A dedicated circuit is required. Professional installation by a qualified electrician is mandatory.

Q: Are sauna stones included? A: No, sauna stones are sold separately. This heater requires approximately 20kg of sauna stones with 5-10cm diameter. We recommend volcanic rocks such as peridotite or olivine diabase.

Q: What is the warranty? A: Harvia provides a 2-year warranty for domestic/family use installations. Warranty covers manufacturing defects but does not cover damage from improper installation, use of unsuitable stones, or failure to follow maintenance instructions.

Q: Can I install this outdoors? A: The SW80 is designed for interior wet area use. For outdoor saunas (garden rooms, barrel saunas), the heater can be used but you must account for additional heat loss when sizing – add approximately 25-30% to your volume calculation.

Q: Can the heater be integrated into a bench? A: Yes, The Wall’s compact design allows integration into the sauna bench structure, providing a seamless appearance. Minimum clearances must still be observed.

📥 Downloads & Resources

📄 Installation & Operating Manual – Complete installation guide with wiring diagrams and safety instructions

📄 Product Data Sheet – Technical specifications and dimensions

📄 Harvia Electric Heaters Brochure – Full range overview and product information

🏆 Why Choose the Harvia The Wall SW80

✅ Finnish Heritage – Over 75 years of sauna expertise from the world’s leading sauna manufacturer

✅ Space-Efficient Design – Compact wall-mounted form maximises usable sauna space

✅ Modern Aesthetics – Sleek Black Steel finish complements contemporary sauna interiors

✅ Reliable Performance – Extra-long heating elements and robust construction ensure long service life

✅ Easy Operation – Illuminated controls make temperature and timing adjustments effortless

✅ Installation Flexibility – Left/right control configuration and bench-integration options

✅ Proven Quality – CE certified with comprehensive 2-year manufacturer warranty

✅ Excellent Value – Premium Finnish quality at competitive pricing

🤝 Why Buy from Parts4Tubs

✅ UK-Based Company – Local support and expertise from our Northamptonshire headquarters

✅ Fast UK Delivery – Quick dispatch on in-stock items

✅ Expert Advice – Knowledgeable team to help with sizing and technical queries

✅ Competitive Pricing – Great value on genuine Harvia products

✅ Full Warranty Support – We stand behind every product we sell

✅ Easy Returns – Hassle-free returns policy

✨ Summary

The Harvia The Wall SW80 8.0kW Black Steel sauna heater delivers authentic Finnish sauna performance in a remarkably compact, stylish package. With 8kW of heating power for rooms up to 12 m³, illuminated controls, flexible installation options, and a generous 20kg stone capacity, it’s the ideal choice for home saunas, garden rooms, and small spa applications. Backed by Harvia’s 75+ years of expertise and a comprehensive 2-year warranty, plus Parts4Tubs’ UK-based support – order today for fast delivery and start enjoying the wellness benefits of genuine Finnish sauna bathing.