♨️ Harvia The Wall 6.0kW Electric Sauna Heater – 5-8 m³ Capacity

Scandinavian Elegance Meets Powerful Performance in a Sleek Black Steel Design

🧖 Product Overview

The Harvia The Wall (HSW600400M) is a 6.0kW wall-mounted electric sauna heater that combines minimalistic Scandinavian design with exceptional heating performance. Crafted in Finland by Harvia, one of the world’s leading sauna manufacturers, this compact yet powerful heater delivers reliable warmth for small to medium-sized sauna rooms between 5-8 m³.

Featuring a sophisticated black steel finish, The Wall transforms your sauna into a contemporary wellness retreat. The built-in illuminated controls eliminate the need for a separate control unit, offering intuitive operation with adjustable timer and thermostat functions. Whether you’re building a new home sauna, upgrading a garden cabin, or converting a compact space into your personal sanctuary, The Wall delivers authentic Finnish sauna heat with style and efficiency.

Designed for versatility, this heater can be installed in left or right-handed configurations and even integrated into the sauna bench for seamless aesthetic appeal.

✨ Key Features

✅ 6.0kW Power Output – Efficient heating capacity perfectly sized for 5-8 m³ sauna rooms, delivering consistent warmth throughout your space

✅ Black Steel Construction – Premium steel exterior in a modern black finish provides durability, corrosion resistance, and contemporary aesthetics

✅ Built-in Illuminated Controls – Integrated timer and thermostat with backlit switches for easy operation in low-light conditions without requiring a separate control unit

✅ 20kg Stone Capacity – Generous stone compartment retains heat effectively for superior steam production and traditional Finnish löyly experience

✅ Flexible Installation – Wall-mounted design with options for left or right-handed installation; can be integrated into sauna bench for seamless design

✅ Finnish Engineering – Manufactured by Harvia in Finland, backed by decades of sauna expertise and quality craftsmanship

✅ Compact Dimensions – Space-efficient design (610mm × 430mm × 260mm) perfect for smaller sauna rooms without compromising performance

✅ Overheat Protection – Built-in safety cut-out prevents overheating, ensuring safe operation at all times

✅ 2-Year Consumer Warranty – Comprehensive manufacturer warranty for domestic/family use provides peace of mind

✅ CE Certified – Meets European safety standards for electrical equipment

🔧 Technical Specifications

Specification	Value
Model	HSW600400M
Power Rating	6.0 kW
Voltage	220-240V single-phase
Room Capacity	5.0 – 8.0 m³
Dimensions (H × W × D)	610 × 430 × 260 mm
Net Weight	11.7 kg
Gross Weight (packaged)	13.4 kg
Stone Capacity	20 kg (max)
Recommended Stone Size	5-10 cm diameter
Mounting	Wall-mounted
Control Type	Built-in timer & thermostat
Timer Function	0-4 hours operation / 0-8 hours delay start
Material	Steel
Colour	Black Steel
Minimum Room Height	1900 mm
IP Rating	Splash-proof construction
Certifications	CE Marked
Warranty	2 years (consumer use)

📏 Room Sizing Guide

Basic Formula:

1 kW = approximately 1-1.5 m³ sauna room volume

The Harvia The Wall 6.0kW is designed for sauna rooms between 5.0 and 8.0 m³.

Adjustment Factors:

Condition	Adjustment
Glass door/windows	+1.5 m³ per m² of glass
Uninsulated/log walls	Multiply volume by 1.5
High ceiling (>2.3m)	Add additional volume accordingly

Worked Example:

📍 Example Room: 2.0m × 1.8m × 2.2m
- Base volume: 7.92 m³
- Glass door (0.8m × 2m = 1.6 m²): +2.4 m³
- Total calculated: 10.32 m³
- Recommendation: Consider the 8kW or 9kW model for this scenario

📍 Ideal Room for 6kW: 1.8m × 1.6m × 2.1m
- Base volume: 6.05 m³
- This 6.0 kW heater: ✅ Perfect fit within 5-8 m³ range

💷 Running Costs

Energy Rate Used: £0.245/kWh (UK average – based on Ofgem price cap October-December 2025)

Cost Calculation:

Usage Level	Sessions/Week	Hours/Year	Annual Cost
🏠 Light Use	2	150	£220.50
🏠 Regular Use	4	300	£441.00
🧖 Heavy Use	6	450	£661.50

Calculation Formula:

Annual Cost = kW × Hours/Year × £0.245

Example (6.0 kW heater, Regular Use):
6.0 kW × 300 hours × £0.245 = £441.00

Per session cost: Approximately £2.21 per 1.5 hour session

⚠️ Actual costs depend on usage patterns, session length, room insulation, and current energy rates. Rates as of Q4 2025.

⚡ Installation Requirements

Electrical Requirements:

Requirement	Specification
Voltage	220-240V single-phase
Connection Type	Semi-permanent to junction box
Cable Type	H07RN-F rubber cable (or equivalent)
Junction Box Height	Maximum 500mm from floor
Junction Box Rating	Splash-proof required
Dedicated Circuit	Required

⚠️ Important: PVC-insulated cables are prohibited for sauna heater connections due to heat sensitivity. Cables installed above 1000mm from floor level must withstand temperatures of at least 170°C.

Minimum Safety Clearances:

Position	Distance
Front (non-combustible surfaces)	30 mm
Front (combustible materials)	40 mm
Side walls (left & right)	40 mm
Ceiling	1200 mm
Minimum room height	1900 mm

Ventilation Requirements:

• Fresh air intake: 50-100mm diameter, positioned near or below the heater
• Exhaust vent: Twice the diameter of intake, positioned opposite side of room near floor level
• Air should exchange approximately 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 sauna heater may be installed per sauna room.

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🛡️ Safety Features & Certifications

Built-in Safety:

• ✅ Thermal cut-out protection with manual reset function
• ✅ Overheat protection (automatic shutdown)
• ✅ Built-in timer with 4-hour maximum continuous operation
• ✅ Splash-proof construction for wet sauna environments
• ✅ Mounting bracket ensures correct safety clearances

Certifications:

• ✅ CE Marked (European Conformity)
• ✅ Manufactured to EU safety standards
• ✅ Finnish quality manufacturing

Important Safety Notes:

• Do not leave children, elderly, or those with mobility issues unattended in the sauna
• Never sleep in a heated sauna
• Do not use the sauna while under the influence of alcohol or medication
• Keep combustible materials away from the heater at all times

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🎯 Ideal Applications

Application	Room Size	Capacity	Notes
🏠 Home Sauna	5-8 m³	2-3 people	Perfect for residential installation
🛖 Garden Sauna Cabin	5-7 m³	2-3 people	Add 25% to volume calculation for outdoor use
🪵 Small Barrel Sauna	5-6 m³	2-3 people	Compact power solution for barrel designs
🧖 Bathroom Conversion	5-8 m³	2 people	Ideal for en-suite sauna installations
🏢 Small Wellness Room	5-8 m³	2-3 people	Suitable for light commercial applications

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🪨 Sauna Stones

• Stone Capacity: 20 kg maximum
• Recommended Stone Size: 5-10 cm diameter
• Stones Included: No (sold separately)
• Recommended Type: Olivine diabase, peridotite, or olivine stones
• Stone Care: Rinse stones before installation to remove dust; re-stack annually
• Replacement: Every 1-2 years with regular use, more frequently with heavy use

⚠️ Important: Do not use ceramic stones or soft soapstone – these do not retain heat adequately and may damage heating elements. Only use natural volcanic stones recommended for sauna use.

View Harvia Sauna Stones

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🎛️ Control Options & Operation

Built-in Control System:

The Harvia The Wall features integrated illuminated controls mounted at the top of the unit for convenient access:

• On/Off Switch: Illuminated for visibility in dim sauna lighting
• Timer Control: 0-4 hours continuous operation, or 0-8 hours delay start function
• Thermostat: Adjustable temperature control for personalised comfort

How to Use:

1. Immediate Start: Turn timer dial clockwise to the operating range (0-4 hours)
2. Delayed Start: Turn timer dial to preset range (0-8 hours) – heater starts automatically when countdown completes
3. Temperature: Adjust thermostat dial to desired comfort level; start at maximum and reduce if needed
4. Shutdown: Turn timer to 0 position, or allow automatic shutoff after the set time

Note: This model features built-in controls and does not support external control panels or WiFi operation. For smart home integration or remote control functionality, consider the Harvia Wall E-series (SW60E) which is compatible with external control units.

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❓ Frequently Asked Questions

Q: What size room will this heater work for? A: This 6.0 kW heater is suitable for sauna rooms between 5.0 and 8.0 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: Typically 45-60 minutes to reach optimal bathing temperature (65-80°C), depending on room size, insulation quality, and outside temperature.

Q: What electrical supply do I need? A: This heater requires a 220-240V single-phase supply with a dedicated circuit. Professional installation by a qualified electrician is mandatory.

Q: Are sauna stones included? A: No, sauna stones are sold separately. You will need up to 20kg of suitable sauna stones (5-10cm diameter). We recommend Harvia olivine diabase stones for optimal performance.

Q: What is the warranty? A: Harvia provides a 2-year warranty for consumer/family use. The warranty does not cover damage from improper installation, use of non-recommended stones, or failure to follow operating instructions.

Q: Can I install this outdoors? A: This heater is designed for indoor sauna rooms. For outdoor or garden sauna cabins, ensure the sauna structure provides adequate weather protection and insulation. The heater itself should not be exposed to direct weather.

Q: Do I need a separate control unit? A: No, The Wall features built-in controls with timer and thermostat. No external control unit is required.

Q: How do I reset the overheat protection? A: If the overheat protector trips, allow the heater to cool to approximately 18°C, then press the reset button located on the unit. Refer to the installation manual for detailed instructions.

📥 Downloads & Resources

📄 Product Data Sheet (PDF) – Official Harvia specifications and dimensions

📄 Installation Manual (PDF) – Complete installation guide with wiring diagrams and safety distances

📄 Electric Heaters Brochure (PDF) – Harvia electric heater range overview

⭐ Why Choose Harvia The Wall 6.0kW

• ✅ Finnish Quality – Manufactured by Harvia, Finland’s leading sauna company with over 70 years of expertise
• ✅ Contemporary Design – Sleek black steel finish complements modern sauna interiors
• ✅ All-in-One Solution – Built-in controls mean no additional control unit purchase required
• ✅ Perfect for Smaller Spaces – Compact dimensions ideal for home saunas, bathroom conversions, and small cabins
• ✅ Proven Reliability – Backed by Harvia’s 2-year consumer warranty
• ✅ Energy Efficient – 6kW output delivers excellent heating without excessive energy consumption
• ✅ Flexible Installation – Left or right-handed mounting; bench integration option

🤝 Why Buy from Parts4Tubs

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

🔥 Summary

The Harvia The Wall 6.0kW (HSW600400M) delivers authentic Finnish sauna performance in a sophisticated black steel package. Designed for rooms between 5-8 m³, this compact wall-mounted heater features built-in illuminated controls, 20kg stone capacity, and integrated safety features. Backed by Harvia’s Finnish heritage and a 2-year consumer warranty, The Wall is the ideal choice for home saunas, garden cabins, and bathroom conversions where space efficiency meets premium quality. Order today from Parts4Tubs for fast UK delivery and expert support.