♨️ Harvia Topclass Combi KV90SE 9kW Sauna Heater – 8-14 m³ Capacity

Transform your sauna into a multi-sensory wellness retreat with Finnish-engineered versatility.

🧖 Product Overview

The Harvia Topclass Combi KV90SE is a premium wall-mounted electric sauna heater with an integrated steam generator, delivering an exceptional range of sauna experiences from a single unit. Crafted in Finland by Harvia – the world’s leading sauna manufacturer with over 70 years of expertise – this 9kW combi heater seamlessly combines traditional dry sauna, steam sauna, herbal sauna, and aromatic sauna capabilities.

The Topclass Combi features a luxurious stainless steel construction throughout, with elegant soapstone cups for liquid fragrances and a stainless steel grate for aromatic herb sachets. The 5-litre water tank enables generous steam production, transforming your bathing experience from crisp Finnish löyly to soft, humid steam at your preference.

Designed for sauna rooms between 8-14 m³, this heater is the ideal choice for discerning home sauna owners who appreciate soft, humid heat combined with aromatic ambience. Requires a separate Harvia control panel for operation.

⭐ Key Features

✅ Dual-Function Combi Design – Combines electric heater and steam generator in one elegant unit, offering traditional Finnish, steam, herbal, and aromatic sauna experiences.

✅ Premium Stainless Steel Construction – High-quality stainless steel exterior and interior ensures durability, corrosion resistance, and lasting aesthetic appeal.

✅ Integrated 5-Litre Water Tank – Manual-fill reservoir provides ample capacity for extended steam sessions without constant refilling.

✅ Aromatic Fragrance System – Includes luxurious soapstone cups for liquid sauna essences and stainless steel grate for herbal sachets.

✅ Finnish Engineering Excellence – Manufactured by Harvia in Finland, the global leader in sauna and spa technology with seven decades of expertise.

✅ Generous Stone Capacity – Accommodates 20 kg of sauna stones for excellent heat retention and authentic löyly steam.

✅ CE Certified – Fully compliant with European safety and quality standards for peace of mind.

✅ 2-Year Residential Warranty – Comprehensive manufacturer warranty for domestic use (1 year commercial).

✅ Compact Wall-Mounted Design – Space-efficient installation ideal for both dedicated sauna rooms and garden sauna cabins.

✅ Compatible Control Options – Works with Harvia Xenio CX110C Combi, Griffin Combi, C105S Logix, and other compatible control units.

🔧 Technical Specifications

Specification	Value
Power Rating	9.0 kW
Voltage	400V 3N~ (3-phase + neutral)
Fuse Size	3 × 16 A
Cable Specification	5 × 2.5 mm² + 2 × 1.5 mm²
Room Capacity	8 – 14 m³
Dimensions (H × W × D)	640 × 400 × 360 mm
Weight	16 kg (without stones)
Stone Capacity	20 kg (max)
Water Tank Capacity	5 litres
Evaporation Rate	2.5 L/hr
Minimum Sauna Height	1,800 mm
Minimum Ceiling Clearance	1,100 mm
Mounting Type	Wall-mounted
Control Unit	External (sold separately)
Construction	Stainless steel (interior & exterior)
Certifications	CE
Warranty	2 years residential / 1 year commercial
Country of Origin	Finland

📐 Room Sizing Guide

Basic Formula:

1 kW ≈ 1 – 1.5 m³ sauna room volume

The Harvia Topclass Combi 9kW is suitable for sauna rooms from 8 to 14 m³.

Adjustment Factors:

Condition	Adjustment
Glass door/windows	+1.5 m³ per m² of glass
Uninsulated/log walls	+25-50% to base volume
Outdoor/barrel sauna	+25-30% to base volume
High ceiling (>2.3m)	Calculate additional volume

Worked Example:

📍 Example Room: 2.2m × 2.0m × 2.1m
• Base volume: 9.24 m³
• Glass door (0.8m × 1.9m = 1.52 m²): +2.28 m³
• Total calculated: 11.52 m³
• This 9kW heater: ✅ Suitable (within 8-14 m³ range)

💡 Tip: For rooms with significant glass elements or log wall construction, consider sizing up. Contact Parts4Tubs for personalised recommendations.

💷 Running Costs

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

Cost Calculation:

Usage Level	Sessions/Week	Hours/Year	Annual Cost
🏠 Light Use	2	150	£356
🏠 Regular Use	4	300	£712
🧖 Heavy Use	6	450	£1,068

Calculation Formula:

Annual Cost = kW × Hours/Year × £0.2635

Example (9kW heater, Regular Use):
9 kW × 300 hours × £0.2635 = £712.45

Per session cost (1.5 hour session):
9 kW × 1.5 hours × £0.2635 ≈ £3.56 per session

⚠️ Actual costs depend on usage patterns, session length, and current energy rates. Rates subject to change – check Ofgem for latest pricing.

⚡ Installation Requirements

Electrical Requirements:

Requirement	Specification
Voltage	400V 3N~ (three-phase + neutral)
Fuse Size	3 × 16 A
Cable Specification	5 × 2.5 mm² + 2 × 1.5 mm²
Dedicated Circuit	Required
RCD Protection	Required (30mA recommended)

Minimum Clearances:

Position	Distance
Ceiling	1,100 mm minimum
Side walls	See installation manual
Benches/seating	500 mm recommended
Combustible materials	Per local building regulations

Sauna Room Requirements:

Requirement	Specification
Minimum room height	1,800 mm
Room volume	8 – 14 m³
Insulation	Vapour barrier and thermal insulation essential
Ventilation	Fresh air intake near heater, exhaust vent on opposite wall

⚠️ IMPORTANT: Installation must be carried out by a qualified electrician 
in accordance with BS 7671 (IET Wiring Regulations) and local building codes.
Three-phase supply required – not suitable for standard 230V domestic circuits.

🛡️ Safety Features & Certifications

Built-in Safety:

✅ Overheat protection with automatic cut-out

✅ Thermal safety limiter

✅ Water tank low-level protection

✅ Stainless steel stone compartment prevents direct element contact

Certifications:

✅ CE Marked – Full European conformity

✅ Manufactured to Harvia’s ISO-certified quality standards

Control Unit Safety Features (when paired with compatible controller):

✅ Maximum operating time limiter (1-6 hours family / 1-12 hours commercial)

✅ Temperature monitoring and limiting

✅ Pre-set delay start function

✅ Door switch compatibility for automatic shut-off

🎯 Ideal Applications

Application	Room Size	Capacity	Notes
🏠 Home Sauna	8-14 m³	3-6 people	Perfect for dedicated indoor sauna rooms
🛖 Garden Sauna	9-14 m³	3-5 people	Ideal for outdoor sauna cabins
🪵 Barrel Sauna	10-14 m³	4-6 people	Compact power with steam capability
🧖 Home Spa	10-14 m³	4-6 people	Wellness enthusiast’s choice
💆 Small Spa Facility	12-14 m³	4-8 people	Light commercial durability

🪨 Sauna Stones

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

💡 Tip: Quality sauna stones are essential for optimal heat retention and steam production. Ask Parts4Tubs about compatible stone options.

🎛️ Control Options & Accessories

Control System: This heater requires a separate external control unit (not included). Compatible controllers include:

Controller	Features
Harvia Xenio CX110C Combi	Touch panel, temperature 40-110°C, humidity 20-95% rH, timer 1-12h
Harvia Griffin Combi	Digital control with combi functionality
Harvia C105S Logix	Advanced digital control system

Compatible Accessories:

Accessory	Description
Safety Rail/Guard	Harvia HGL3 or compatible heater guard
External Control Panel	Various Harvia Xenio and Griffin options
Sauna Stones	20kg box of 5-10cm sauna stones
Fragrance Oils	Harvia sauna essences for soapstone cups
Herb Sachets	Aromatic herbs for stainless steel grate

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❓ Frequently Asked Questions

Q: What size room will this heater work for? A: The Harvia Topclass Combi KV90SE 9kW heater is suitable for sauna rooms between 8 and 14 m³. For rooms with glass doors, windows, or uninsulated walls, add 25-50% to your base volume calculation.

Q: How long does it take to heat up? A: Typically 30-45 minutes to reach optimal sauna temperature (70-90°C), depending on room size, insulation quality, and ambient starting temperature.

Q: What electrical supply do I need? A: This heater requires a 400V three-phase supply (3N~) with a 3 × 16A circuit breaker and appropriate cable sizing (5 × 2.5 mm²). Professional installation by a qualified electrician is mandatory.

Q: Are sauna stones included? A: No, sauna stones are sold separately. You will need 20 kg of quality sauna stones (5-10 cm diameter). Parts4Tubs stock compatible stones.

Q: Is a control panel included? A: No, this heater requires a separate Harvia control unit such as the Xenio CX110C Combi. Contact Parts4Tubs for control panel options.

Q: What is the warranty? A: 2 years for residential use, 1 year for commercial applications. Contact Parts4Tubs for full warranty terms and conditions.

Q: Can I use this for a steam sauna? A: Yes! The integrated 5-litre water tank and steam generator allow you to enjoy traditional dry sauna, steam sauna, herbal sauna, or aromatic sauna experiences – all from one unit.

Q: Can I install this in an outdoor sauna? A: Yes, this heater is suitable for outdoor sauna cabins when properly installed with appropriate weatherproofing and electrical protection.

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📥 Downloads & Resources

📄 Instruction Manual – Complete installation and operating guide

📄 Product Brochure – Harvia electric heaters catalogue

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🏆 Why Choose the Harvia Topclass Combi KV90SE

✅ Multi-Experience Versatility – One heater delivers traditional Finnish, steam, herbal, and aromatic sauna experiences

✅ Finnish Quality Assurance – Manufactured by Harvia, the world’s leading sauna company with 70+ years expertise

✅ Premium Stainless Steel – Durable, corrosion-resistant construction for years of reliable performance

✅ Generous Steam Capacity – 5-litre tank with 2.5 L/hr evaporation for luxurious humid heat

✅ Space-Efficient Design – Compact wall-mounted unit maximises sauna floor space

✅ CE Certified Safety – Fully compliant with European safety standards

🤝 Why Buy From Parts4Tubs

✅ UK-based company with local support and expertise

✅ Fast UK delivery on in-stock items

✅ Expert advice from sauna and spa specialists

✅ Competitive pricing on Harvia products

✅ Full warranty support and after-sales service

✅ Easy returns within 30 days

✨ Summary

The Harvia Topclass Combi KV90SE 9kW sauna heater delivers the ultimate in bathing versatility for sauna rooms from 8-14 m³. This Finnish-engineered combi unit combines premium stainless steel construction with an integrated steam generator, aromatic fragrance system, and 20 kg stone capacity to create four distinct sauna experiences in one elegant package. CE certified, backed by a 2-year residential warranty, and supported by Parts4Tubs’ UK expertise – order today for fast delivery.