♨️ Harvia The Wall SW80 8.0kW Sauna Heater – 7-12 m³ Capacity

Finnish Engineering Meets Minimalist Design: Space-Saving Power for Your Perfect Sauna Experience

📋 Product Overview

The Harvia The Wall SW80 is a premium 8.0kW electric sauna heater that perfectly balances powerful performance with sleek Scandinavian minimalism. Designed and manufactured in Finland by Harvia – the world’s leading sauna brand – this wall-mounted heater delivers exceptional heat output whilst occupying remarkably little space in your sauna room.

The Wall SW80 features built-in illuminated controls positioned at the top of the unit for effortless operation, even in dimly lit sauna environments. The thoughtful design allows for both left and right-handed installation configurations, giving you complete flexibility when planning your sauna interior. With its compact dimensions and ability to be integrated beneath sauna benches, The Wall SW80 is the ideal choice for home saunas where space is at a premium but performance cannot be compromised.

Engineered for sauna rooms between 7 and 12 cubic metres, this heater provides consistent, reliable heat for the authentic Finnish sauna experience. CE certified and backed by Harvia’s comprehensive 2-year domestic warranty, The Wall SW80 represents outstanding quality and value for discerning sauna enthusiasts.

✨ Key Features

✅ 8.0kW Power Output – Delivers powerful, efficient heating for sauna rooms from 7-12 m³, reaching optimal bathing temperature in approximately 45-60 minutes

✅ Built-in Illuminated Controls – Timer and thermostat switches feature integrated lighting for easy operation in low-light conditions

✅ Flexible Installation – Can be configured for left or right-handed operation; may be integrated beneath sauna benches for maximum space efficiency

✅ Reinforced Heating Elements – Proprietary support structure prevents element twisting, significantly extending operational lifespan

✅ Protected Components – Heat and moisture-sensitive parts positioned at the bottom of the unit for enhanced durability and reliability

✅ 20kg Stone Capacity – Generous stone compartment delivers excellent heat retention and authentic löyly steam production

✅ Compact Wall-Mount Design – Space-saving dimensions (700 × 430 × 260 mm) leave more room for benches and bathers

✅ Included Mounting Bracket – Purpose-designed wall rack establishes correct safety clearances automatically

✅ CE Certified & EAC Listed – Fully compliant with European safety standards and regulations

✅ 2-Year Domestic Warranty – Comprehensive manufacturer’s warranty for peace of mind

⚙️ Technical Specifications

Specification	Value
Model Number	HSW800400 / SW80
Power Rating	8.0 kW
Voltage	400V 3-phase / 230V single-phase*
Room Capacity	7 – 12 m³
Dimensions (H × W × D)	700 × 430 × 260 mm
Weight	13.6 kg
Stone Capacity	20 kg maximum
Stone Size	5-10 cm diameter
Heat-up Time	45-60 minutes (typical)
Timer Range	0-4 hours operation / 0-8 hours pre-set
Thermostat	Built-in, adjustable
Mounting	Wall-mounted
Control Type	Built-in illuminated controls
Construction	Steel outer casing
Certifications	CE, EAC
Warranty	2 years (domestic use)
Country of Origin	Finland

*Electrical connection must be carried out by a qualified electrician. Connection requirements depend on your specific electrical supply.

📏 Room Sizing Guide

Basic Sizing Formula: 1 kW heats approximately 1-1.5 m³ of well-insulated sauna space.

The Harvia The Wall SW80 at 8.0kW is engineered for sauna rooms between 7 and 12 cubic metres.

Adjustment Factors:

Condition	Adjustment
Glass door or window	Add 1.2 m³ per m² of glass
Uninsulated or log walls	Multiply room volume by 1.5
Outdoor/barrel sauna	Add 25-30% to calculated volume
Ceiling height above 2.3m	Add additional volume for excess height

Worked Example: 📍 Sample Room: 2.2m × 1.8m × 2.1m

• Base volume: 8.32 m³
• Glass door (0.8m × 2m = 1.6 m²): +1.92 m³
• Total calculated volume: 10.24 m³
• Harvia The Wall SW80 (7-12 m³): ✅ Ideal Match

Quick Reference:

Room Dimensions	Volume	SW80 Suitability
1.8m × 1.8m × 2.1m	6.8 m³	⚠️ Consider SW60
2.0m × 1.8m × 2.1m	7.6 m³	✅ Suitable
2.2m × 2.0m × 2.1m	9.2 m³	✅ Optimal
2.5m × 2.0m × 2.1m	10.5 m³	✅ Suitable
2.8m × 2.0m × 2.2m	12.3 m³	⚠️ Consider SW90

💷 Running Costs

Energy Rate Used: £0.27/kWh (UK average Q1 2026 – Source: Ofgem Price Cap)

Annual Cost Estimates:

Usage Level	Sessions/Week	Hours/Year	Annual Cost
🏠 Light Use	2	150	£324
🏠 Regular Use	4	300	£648
🧖 Heavy Use	6+	450	£972

Cost Calculation Formula:

Annual Cost = kW × Hours/Year × £0.27

Example (8.0kW heater, Regular Use):
8.0 kW × 300 hours × £0.27 = £648 per year

Per Session Cost (1.5 hour session):
8.0 kW × 1.5 hours × £0.27 = £3.24 per session

Cost Comparison with Other Models:

Heater Size	Light Use	Regular Use	Heavy Use
6kW	£243/year	£486/year	£729/year
8kW (This Model)	£324/year	£648/year	£972/year
9kW	£365/year	£729/year	£1,094/year

⚠️ Actual costs depend on usage patterns, session length, room insulation, and current energy rates. Prices shown are estimates based on Ofgem Q1 2026 price cap.

🔌 Installation Requirements

Electrical Requirements:

Requirement	Specification
Supply Options	400V 3-phase or 230V single-phase
Cable Type	H07RN-F rubber cable (or equivalent heat-resistant)
Dedicated Circuit	Required
Connection	Semi-permanent to junction box (max 500mm from floor)

Minimum Safety Clearances (from combustible materials):

Position	Distance
Front	30 mm
Left side	70 mm
Right side	70 mm
Rear (from wall)	80 mm
To ceiling	1200 mm
Minimum room height	1900 mm

Space Requirements:

Measurement	Value
Installation opening width	570 mm
Installation opening depth	290 mm
Total wall space required	C + 430 + C = 570 mm (width)

Ventilation Requirements:

• Fresh air inlet: Position near or below heater, 50-100 mm diameter
• Exhaust outlet: Position opposite heater, near floor level, minimum 100-150 mm diameter
• Air changes: Sauna air should change 6 times per hour minimum

⚠️ IMPORTANT: All electrical installation must be carried out by a qualified 
electrician in accordance with BS 7671 (IET Wiring Regulations) and local 
building regulations. The heater must be connected to a dedicated circuit 
with appropriate overcurrent protection.

🔒 Safety Features & Certifications

Built-in Safety Systems:

• ✅ Thermal cut-out protection (automatic shutdown if overheating detected)
• ✅ Overheat protection with manual reset
• ✅ Maximum 4-hour continuous operation timer (auto-shutoff)
• ✅ Reinforced element support structure (prevents element damage)
• ✅ Protected component positioning (heat/moisture-sensitive parts at bottom)

Certifications:

• ✅ CE Marked (European Conformity)
• ✅ EAC Certified (Eurasian Conformity)
• ✅ Designed and manufactured in Finland
• ✅ Compliant with European Low Voltage Directive

Safety Notes:

• Stones must be correctly loaded – never operate with empty or underfilled stone compartment
• Maintain all minimum clearance distances from combustible materials
• Never cover heater or place items on top
• Never operate heater without proper ventilation
• Children should be supervised at all times in the sauna

🎯 Ideal Applications

Application	Room Size	Bathers	Suitability
🏠 Home Sauna (Indoor)	7-10 m³	2-4 people	✅ Excellent
🏡 Home Sauna (Garden Room)	8-12 m³	2-4 people	✅ Excellent
🛖 Garden Sauna Cabin	8-12 m³	3-5 people	✅ Excellent
🪵 Barrel Sauna (6-8 person)	8-10 m³	4-6 people	✅ Good (check insulation)
🏋️ Small Gym/Fitness Sauna	7-12 m³	3-5 people	✅ Good
🧖 Private Spa	8-12 m³	2-4 people	✅ Excellent

Best For:

• Medium-sized domestic sauna rooms
• Spaces where wall mounting is preferred
• Installations requiring flexible left/right configuration
• Saunas where heater integration under bench is desired
• Users seeking illuminated controls for low-light operation

🪨 Sauna Stones

Specification	Details
Stone Capacity	20 kg maximum
Recommended Stone Size	5-10 cm diameter
Stones Included	No – sold separately
Recommended Type	Olivine diabase, peridotite, or vulcanite
Replacement Interval	Every 1-2 years with regular use

Stone Loading Guidelines:

• Wash stones thoroughly before loading to remove dust
• Stack stones loosely to allow air circulation between them
• Ensure heating elements are completely covered and not visible
• Do not overfill – maximum 20 kg
• Check stone condition annually; replace cracked or crumbling stones

⚠️ Important: Never use ceramic stones or soft soapstone. These materials do not retain heat effectively and may damage heating elements.

🎛️ Control Options & Accessories

Built-in Control System:

• Timer: 0-4 hours direct operation with illuminated indicator
• Pre-set Timer: 0-8 hours delay start function
• Thermostat: Adjustable temperature control with illuminated indicator
• Control Position: Top-mounted for easy access; configurable left or right

Compatible Accessories (sold separately):

• Safety rail/guard for benches near heater
• Sauna stones (20 kg required)
• Thermometer/hygrometer
• Sauna bucket and ladle set

Control Unit Versions: The SW80 features built-in controls. For external control panel operation, see the Harvia The Wall E series (SW45E, SW60E, SW90E) which requires a separate control unit such as:

• Harvia Xenio CX110
• Harvia Xafir CS110
• Harvia C150/C260

❓ Frequently Asked Questions

Q: What size room will this heater work for? A: The Harvia The Wall SW80 (8.0kW) is designed for sauna rooms between 7 and 12 cubic metres. For rooms with glass doors, windows, or uninsulated walls, add 1.2 m³ per square metre of glass/uninsulated surface to your 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 ambient starting temperature.

Q: What electrical supply do I need? A: This heater is available in 400V 3-phase and 230V single-phase variants. Professional installation by a qualified electrician is mandatory. The electrician will assess your electrical supply and specify the appropriate circuit protection.

Q: Are sauna stones included? A: No, sauna stones are sold separately. You will need approximately 20 kg of quality sauna stones (5-10 cm diameter). We recommend olivine diabase or peridotite stones.

Q: What is the warranty? A: Harvia provides a 2-year warranty for domestic/family use installations. Commercial installations (apartment buildings) have a 1-year warranty. Institutional use carries a 3-month warranty.

Q: Can I install this heater myself? A: The mechanical mounting can be completed as a DIY project following the installation manual. However, all electrical connections must be completed by a qualified electrician in compliance with BS 7671 (UK Wiring Regulations).

Q: Can this heater be installed in an outdoor sauna? A: Yes, The Wall SW80 can be used in outdoor sauna cabins provided the sauna room itself is fully enclosed and weatherproofed. The heater should not be exposed to direct moisture or rain.

Q: What’s the difference between SW and SWE models? A: SW models (like this SW80) have built-in controls. SWE models require a separate external control panel. Both have identical heating performance.

📥 Downloads & Resources

📄 Installation Manual (PDF) – Complete installation guide with wiring diagrams, safety clearances, and technical specifications

📄 Product Data Sheet (PDF) – Technical specifications and dimensions (Note: Reference 6kW datasheet for format; 8kW specs as per installation manual)

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

🏆 Why Choose The Harvia The Wall SW80

✅ Finnish Heritage – Designed and manufactured in Finland by Harvia, the world’s leading sauna and spa brand with over 70 years of expertise

✅ Space-Efficient Design – Compact wall-mounted format maximises usable sauna space; can be integrated under benches

✅ Built-in Controls – No need for separate control panel; illuminated switches for easy low-light operation

✅ Flexible Installation – Left or right-hand configuration options to suit any sauna layout

✅ Durable Construction – Reinforced element supports and protected components ensure long operational life

✅ Proven Performance – 8.0kW output reliably heats 7-12 m³ rooms to optimal temperature

✅ 2-Year Warranty – Comprehensive manufacturer backing for domestic installations

✅ CE Certified – Full compliance with European safety standards

🤝 Why Buy from Parts4Tubs

✅ UK-Based Company – Local support from Northamptonshire-based specialists

✅ Fast UK Delivery – Prompt dispatch to addresses throughout the United Kingdom

✅ Expert Advice – Knowledgeable team available for sizing advice and technical questions

✅ Competitive Pricing – Great value on genuine Harvia products

✅ Full Warranty Support – Authorised dealer with manufacturer warranty backing

✅ Easy Returns – 30-day returns policy for peace of mind

⭐ Summary

The Harvia The Wall SW80 8.0kW sauna heater combines Finnish engineering excellence with practical, space-saving design. Delivering powerful heating for rooms between 7 and 12 cubic metres, this wall-mounted heater features illuminated built-in controls, flexible left/right installation, and the option to integrate beneath sauna benches. With reinforced heating elements, comprehensive safety features, and Harvia’s 2-year domestic warranty, The Wall SW80 is the ideal choice for home sauna enthusiasts who demand reliability, performance, and authentic Finnish sauna quality. Order today from Parts4Tubs for fast UK delivery and expert support.