🧖 Harvia The Wall Combi SW45S 4.5kW Sauna Heater – 3-6 m³ Capacity

Premium Finnish steam sauna heating with precision humidity control for the ultimate wellness experience

♨️ Product Overview

The Harvia Wall Combi SW45S represents the pinnacle of Finnish sauna engineering, combining traditional dry sauna heating with an integrated steam generation system in one compact, wall-mounted unit. Designed for those who appreciate the full spectrum of sauna bathing, from crisp dry heat to gentle humid warmth, this versatile heater transforms your sauna room into a multi-sensory wellness sanctuary.

Manufactured by Harvia, Finland’s leading sauna company celebrating over 75 years of excellence, the Wall Combi delivers uncompromising quality in a space-saving design that suits homes, garden saunas, and small spa installations. The integrated steamer maintains humidity with remarkable precision (up to 1% accuracy), whilst the robust stainless steel construction ensures years of reliable service. Controlled via a separate Xenio Combi control unit (sold separately), you gain complete command over both temperature and humidity settings from outside the sauna room.

⭐ Key Features

✅ Integrated Steam Generator – Built-in steamer produces up to 2.5 kg/h of steam, allowing seamless transition between dry Finnish sauna and humid steam bathing without additional equipment

✅ Precision Humidity Control – Maintains sauna humidity with up to 1% accuracy when paired with Xenio Combi control unit, ensuring consistent and comfortable steam sessions every time

✅ Premium Stainless Steel Construction – Durable stainless steel exterior resists corrosion and heat damage whilst providing a contemporary aesthetic that complements any sauna interior

✅ Compact Wall-Mounted Design – Space-efficient form factor (710 × 380 × 355 mm) frees up valuable floor space and enables installation in smaller sauna rooms

✅ Generous 20 kg Stone Capacity – Substantial stone load delivers excellent heat retention and produces quality löyly (steam) when water is thrown on the stones

✅ Fragrance Stone Cup – Dedicated cup on the front allows addition of aromatic essences for enhanced sensory experience during bathing

✅ Safe Water Drainage – Easy and safe drainage of steamer water container prevents standing water and simplifies maintenance

✅ Full-Opening Front Panel – Complete access to internal water container for thorough cleaning and maintenance

✅ Quick Installation System – Harvia wall mounting bracket included, ensuring correct safety distances and straightforward fitting

✅ CE Certified – Fully compliant with European safety standards, backed by Harvia’s quality assurance

🔧 Technical Specifications

Specification	Value
Model Number	HSW450400S (SW45S)
Power Rating	4.5 kW
Voltage Options	400V 3N~ / 230V 1N~
Fuse Size (400V 3N~)	3 × 10 A
Fuse Size (230V 1N~)	25 A
Supply Cable (400V 3N~)	5 × 1.5 mm²
Room Capacity	3 – 6 m³
Dimensions (H × W × D)	710 × 380 × 355 mm
Net Weight	16 kg
Gross Weight (Packaged)	13.5 kg
Stone Capacity	20 kg
Recommended Stone Size	Ø 5–10 cm
Steam Output	2.5 kg/h
Mounting Type	Wall (vertical orientation)
IP Rating	IPX4
Control Type	Separate control unit required
Certifications	CE, EAC
Use Environment	Interior – wet area
User Group	Households
Main Material	Stainless Steel

📐 Room Sizing Guide

Basic Formula:

1 kW = approximately 1–1.5 m³ sauna room volume

The Harvia Wall Combi SW45S is rated for sauna rooms between 3 m³ and 6 m³.

Adjustment Factors:

Condition	Adjustment
Glass door or windows	Add +1.5 m³ per m² of glass
Uninsulated or log walls	Add +25–50% to base volume
Outdoor or barrel sauna	Add +25–30% to base volume
High ceilings (above 2.3 m)	Calculate additional volume

Worked Example:

📍 Example Room: 1.8 m × 1.5 m × 2.1 m

• Base volume: 5.67 m³
• Glass door (0.7 m × 2.0 m = 1.4 m²): +2.1 m³
• Effective volume: 7.77 m³
• Recommendation: This room is at the upper limit for the SW45S. Consider the 6 kW model for rooms with significant glass areas.

📍 Example Room: 1.5 m × 1.3 m × 2.0 m

• Base volume: 3.9 m³
• No glass, well-insulated
• Effective volume: 3.9 m³
• This 4.5 kW heater: ✅ Ideal match within the 3–6 m³ range

💷 Running Costs

Energy Rate Used: £0.245/kWh (UK Ofgem price cap rate, Q1 2026)

Annual Cost Estimates:

Usage Level	Sessions/Week	Hours/Year	Annual Cost
🏠 Light Use	2	150	£165
🏠 Regular Use	4	300	£331
🧖 Heavy Use	6	450	£496

Cost Calculation Formula:

Annual Cost = kW × Hours/Year × £0.245

Example (4.5 kW heater, Regular Use):
4.5 kW × 300 hours × £0.245 = £330.75

Per session cost (1.5-hour session):
4.5 kW × 1.5 hours × £0.245 = approximately £1.65 per session

⚠️ Actual costs depend on usage patterns, session length, insulation quality, and current energy rates. The heater does not run at full power continuously once target temperature is reached.

⚡ Installation Requirements

Electrical Requirements:

Requirement	Specification
Voltage (3-phase)	400V 3N~
Voltage (single-phase)	230V 1N~
Fuse Size (3-phase)	3 × 10 A
Fuse Size (single-phase)	25 A
Cable Size (3-phase)	5 × 1.5 mm²
Dedicated Circuit	Required
IP Rating	IPX4

Minimum Safety Clearances:

Position	Distance
Front (all materials)	20 mm
Left side (all materials)	35 mm
Right side (all materials)	35 mm
Ceiling	1,200 mm
Floor	80 mm
Minimum room height	2,000 mm
Installation opening height	2,000 mm

Ventilation:

• Fresh air intake should be positioned below or beside the heater
• Exhaust vent recommended at high level on opposite wall
• Refer to installation manual for detailed ventilation guidance

⚠️ IMPORTANT: Installation must be carried out by a qualified electrician in accordance with BS 7671 (IET Wiring Regulations) and local building codes. The heater requires a dedicated circuit and appropriate isolation switch.

🛡️ Safety Features & Certifications

Built-in Safety:

✅ Thermal cut-out protection – Automatically shuts down if unsafe temperatures are detected

✅ Overheat protection – Secondary safety system prevents overheating

✅ IPX4 splash protection rating – Suitable for wet sauna environments

✅ Safe water container drainage – Prevents accidental burns during maintenance

✅ Wall mounting bracket – Ensures correct installation height and safety distances

Certifications:

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

✅ EAC Certified – Eurasian Conformity certification

🎯 Ideal Applications

Application	Room Size	Suitability	Notes
🏠 Home Sauna	3–6 m³	✅ Excellent	Perfect for compact residential saunas
🛖 Garden Sauna	3–5 m³	✅ Very Good	Account for heat loss in calculation
🪵 Barrel Sauna	3–4 m³	✅ Good	Calculate curved wall volume carefully
🧖 Small Spa	4–6 m³	✅ Good	Suitable for light commercial use
💆 Wellness Room	3–5 m³	✅ Excellent	Ideal for dedicated steam bathing

🪨 Sauna Stones

Stone Specifications:

Detail	Specification
Stone Capacity	20 kg
Recommended Stone Size	Ø 5–10 cm diameter
Stones Included	No (sold separately)
Recommended Type	Olivine diabase, Vulcanite, or Harvia branded stones
Replacement Interval	Every 1–2 years with regular use

Stone Care Tips:

• Arrange stones loosely to allow air circulation
• Place larger stones at the bottom, smaller at the top
• Check stones annually for cracks or deterioration
• Replace any crumbling or damaged stones promptly

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🎛️ Control Options & Accessories

Control System:

The Harvia Wall Combi SW45S requires a separate control unit (not included). This heater is designed to work with:

Compatible Control Unit	Features
Xenio Combi CX110C	Touch control panel, temperature 40–110°C, humidity control, timer 1–6 hours (family) / 1–12 hours (commercial), lighting and fan control
Xenio Combi CX110CXW WiFi	All CX110C features plus WiFi connectivity and MyHarvia app control
Xenio Combi CX1104CXWIP	IPX5 rated for in-sauna installation, WiFi, door sensor included

Control Features (with Xenio Combi):

• Temperature range: 40–110°C
• Timer: 1–6 hours (household) / 1–12 hours (commercial)
• Pre-set delay: 0–12 hours
• Steam humidity: Adjustable in 1% increments
• Lighting control: Up to 100W
• Fan control: Up to 100W

Optional Accessories:

• Harvia Sauna Stones (20 kg required)
• Safety rail/heater guard
• WiFi-enabled control panel upgrade

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❓ Frequently Asked Questions

Q: What size sauna room will this heater work for? A: The Wall Combi SW45S is designed for sauna rooms between 3 and 6 m³. For rooms with glass doors, uninsulated walls, or outdoor installations, add 25–50% to your base volume calculation to determine if this model is suitable.

Q: How long does it take to heat up the sauna? A: Typically 30–45 minutes to reach optimal bathing temperature, depending on room size, insulation quality, and target temperature. Well-insulated smaller rooms will heat faster.

Q: What electrical supply do I need? A: This heater can operate on either 400V 3-phase (3 × 10A fuse, 5 × 1.5 mm² cable) or 230V single-phase (25A fuse) supply. A dedicated circuit is required. Professional installation by a qualified electrician is mandatory.

Q: Are sauna stones included? A: No, stones are sold separately. This heater requires 20 kg of sauna stones sized Ø 5–10 cm. We recommend high-quality olivine diabase or Harvia branded stones.

Q: Do I need a separate control unit? A: Yes, the Wall Combi SW45S requires a separate Harvia Xenio Combi control unit (CX110C or WiFi variant) to operate. This allows flexible installation of the control panel outside the sauna room.

Q: Can I use this as a traditional dry sauna heater? A: Yes, the Wall Combi can be used as a traditional dry Finnish sauna heater without activating the steam function. You get full flexibility to choose your preferred bathing style.

Q: What is the warranty? A: Please contact Parts4Tubs for full warranty terms and conditions applicable to UK purchases.

Q: Can I install this heater myself? A: Electrical installation must be carried out by a qualified electrician in accordance with BS 7671 regulations. The wall mounting bracket simplifies physical installation but electrical connection requires professional expertise.

📥 Downloads & Resources

📄 Installation Manual (EN) – Complete installation guide with wiring diagrams

📄 Harvia Electric Heaters Brochure – Full product range overview

🏆 Why Choose The Harvia Wall Combi SW45S

✅ Dual Functionality – One heater delivers both traditional dry sauna and steam bathing experiences

✅ Finnish Engineering Excellence – 75+ years of Harvia expertise in every component

✅ Space-Efficient Design – Wall-mounted unit maximises floor space in compact saunas

✅ Precision Steam Control – Industry-leading 1% humidity accuracy for consistent steam bathing

✅ Premium Build Quality – Stainless steel construction for durability and easy maintenance

✅ Flexible Installation – Separate control unit allows convenient placement outside sauna

✅ CE Certified Safety – Full compliance with European safety standards

🤝 Why Buy From Parts4Tubs

✅ UK-based company with dedicated local support

✅ Fast UK delivery on sauna heaters and accessories

✅ Expert advice from experienced sauna specialists

✅ Competitive pricing on Harvia products

✅ Full warranty support and after-sales service

✅ Easy returns within 30 days

✨ Summary

The Harvia Wall Combi SW45S 4.5kW delivers the versatility of both dry and steam sauna bathing in one elegant, wall-mounted package. Designed for rooms between 3–6 m³, this premium Finnish heater features precision humidity control (up to 1% accuracy), 20 kg stone capacity, and robust stainless steel construction. Requiring a separate Xenio Combi control unit for operation, the SW45S offers flexible installation and the option for WiFi app control. CE certified and backed by Harvia’s 75-year heritage, it’s the perfect choice for home wellness enthusiasts who demand authentic Finnish sauna quality. Order today from Parts4Tubs for fast UK delivery and expert support.