♨️ Harvia Virta HL90 9kW Black Sauna Heater – 8-14 m³ Capacity

Finnish Engineering for Abundant Steam and Effortless Maintenance

🧖 Product Overview

The Harvia Virta HL90 9kW Black Sauna Heater is a premium floor-standing electric heater engineered for sauna enthusiasts who demand reliability, powerful performance, and exceptional ease of maintenance. Manufactured by Harvia, Finland’s leading sauna equipment specialist with 75 years of expertise, this heater is built to deliver abundant soft steam session after session.

Designed for sauna rooms between 8 and 14 m³, the Virta HL90 features a robust steel construction with an elegant black finish that complements any contemporary sauna interior. The innovative separated heating element design extends component lifespan significantly, whilst the front-access maintenance hatch allows quick servicing without disturbing the 50kg stone load.

Whether you’re fitting out a home sauna for regular family use or specifying equipment for a demanding commercial installation, the Harvia Virta HL90 delivers the performance and durability that professionals trust worldwide.

⭐ Key Features

• ✅ 9kW Power Output – Rapid heat-up and consistent temperature maintenance for rooms up to 14 m³
• ✅ 50kg Stone Capacity – Generous stone load provides soft, abundant steam with excellent heat retention
• ✅ Separated Heating Elements – Innovative design keeps elements away from stones for extended lifespan
• ✅ Front Maintenance Hatch – Quick access for servicing without disturbing stones or connections
• ✅ Robust Steel Construction – Heavy-duty build quality rated for both residential and professional use
• ✅ Floor-Standing Installation – Stable positioning with adjustable legs for perfect vertical alignment
• ✅ IPX4 Water Protection – Suitable for wet sauna environments with water splash protection
• ✅ CE Certified – Full European conformity certification for peace of mind
• ✅ Thermal Cut-Out Protection – Automatic safety shutdown prevents dangerous overheating
• ✅ 1 Year Manufacturer Warranty – Comprehensive coverage for residential installations

🔧 Technical Specifications

Specification	Value
Model Number	HL900400 (HL90)
Power Rating	9 kW
Voltage	400V 3N~ (Three-Phase)
Fuses Required	3 × 16 A
Cable Specification	5 × 2.5 mm²
Electrical Frequency	50/60 Hz
Room Capacity	8 – 14 m³
Dimensions (H × W × D)	810 × 415 × 340 mm
Net Weight	27 kg
Stone Capacity	50 kg
Stone Size Recommended	Ø 10-15 cm
Mounting	Floor-standing
IP Rating	IPX4
Certifications	CE, EAC
Warranty	1 year (residential) / 3 months (commercial)

📐 Room Sizing Guide

Basic Formula:

1 kW = approximately 1-1.5 m³ sauna room volume

Adjustment Factors:

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

Worked Example:

📍 Example Room: 2.2m × 2m × 2.1m

• Base volume: 9.24 m³
• Glass door (0.8m × 2m = 1.6 m²): +2.4 m³
• Total calculated: 11.64 m³
• This 9 kW heater: ✅ Suitable for 8-14 m³

💡 Tip: For log cabin or barrel saunas, always calculate the adjusted volume. A standard 3m barrel sauna typically requires adjustment to around 10-12 m³ effective volume.

💷 Running Costs

Energy Rate Used: £0.264/kWh (UK average – Ofgem price cap Q4 2025)

Cost Calculation:

Usage Level	Sessions/Week	Hours/Year	Annual Cost
🏠 Light Use	2	150	£356
🏠 Regular Use	4	300	£713
🧖 Heavy Use	6	450	£1,069

Calculation Formula:

Annual Cost = kW × Hours/Year × £0.264

Example (9 kW heater, Regular Use):
9 kW × 300 hours × £0.264 = £712.80

Per session cost: Approximately £3.56 per 1.5 hour session

⚠️ Actual costs depend on usage patterns, session length, insulation quality, and current energy rates. Rates may vary by region and tariff.

⚡ Installation Requirements

Electrical Requirements:

Requirement	Specification
Voltage	400V 3N~ (Three-Phase)
Fuse Rating	3 × 16 A
Cable Size	5 × 2.5 mm²
Dedicated Circuit	Required
Connection	Hardwired – no plug connection

Minimum Clearances:

Position	Distance
Front wall	30 mm
Side walls	30 mm
Rear wall	30 mm
Ceiling	1100 mm
Benches	500 mm (recommended)
Combustible materials	30 mm minimum

Room Requirements:

Requirement	Specification
Minimum room height	1900 mm
Installation opening (H × W × D)	1900 × 475 × 400 mm

Ventilation:

• Fresh air intake: Near heater at floor level, approximately 100mm from floor
• Exhaust vent: Opposite wall, approximately 150mm from ceiling or as low as 600mm from floor
• Air change requirement: 5 complete air changes per hour

⚠️ IMPORTANT: Installation must be carried out by a qualified electrician in accordance with BS 7671 (IET Wiring Regulations) and local building codes. The heater must be permanently hardwired – plug connections are not permitted.

🛡️ Safety Features & Certifications

Built-in Safety:

• ✅ Thermal cut-out protection – automatically shuts down if overheating detected
• ✅ Overheat protectors with manual reset
• ✅ IPX4 splash protection rating for wet sauna environments
• ✅ Separated heating elements reduce stone contact damage
• ✅ Sturdy floor-standing design prevents tipping

Certifications:

• ✅ CE Marked – European Conformity
• ✅ EAC Certified – Eurasian Conformity
• ✅ IPX4 Rated – Water splash protection

Temperature Sensor: A temperature sensor (4m cable) is included with the heater for use with compatible external control units.

🎯 Ideal Applications

Application	Room Size	Capacity	Notes
🏠 Home Sauna	8-14 m³	2-6 people	Perfect for residential installations
🛖 Garden Sauna	8-12 m³	3-5 people	Adjust volume for outdoor conditions
🪵 Barrel Sauna	8-12 m³	4-6 people	Allow +25% volume for curved walls
🧖 Small Spa	10-14 m³	4-6 people	Commercial-grade durability
🏋️ Gym/Fitness	10-14 m³	4-6 people	Built for frequent use

🪨 Sauna Stones

• Stone Capacity: 50 kg
• Recommended Stone Size: Ø 10-15 cm diameter
• Stones Included: No – sold separately
• Recommended Types: Olivine diabase, Peridotite, or volcanic sauna stones
• Replacement: Inspect annually, replace every 1-2 years with regular use

💡 Stone Loading Tips:

• Wash stones before initial use to remove dust
• Place stones loosely to allow air circulation
• Do not stack stones too high above heater
• Check regularly for crumbled stones and replace as needed

🎛️ Control Options & Accessories

Control System:

This heater requires a separate external control unit (not included). The heater comes with a temperature sensor (4m cable length) for connection to your chosen controller.

Compatible Control Units:

• Harvia Xenio CX WiFi Control – Smart app connectivity
• Harvia C170VKK Control Panel – Weekly timer programming
• Harvia C90 Digital Control – Basic digital control
• Other compatible Harvia control panels for heaters up to 17kW

Included Accessories:

• Temperature sensor (WX248) with 4m cable
• Fastening kit for installation
• Installation and operating instructions

Optional Accessories:

• Sauna stones (50kg required)
• Safety rail/heater guard
• Compatible external control panel

❓ Frequently Asked Questions

Q: What size room will this heater work for? A: This 9 kW heater is suitable for well-insulated sauna rooms between 8 and 14 m³. For rooms with glass doors, uninsulated walls, or outdoor installations, 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 starting temperature.

Q: What electrical supply do I need? A: This heater requires a 400V three-phase supply with 3 × 16A fuses and 5 × 2.5mm² cable. A dedicated circuit and professional installation by a qualified electrician is mandatory.

Q: Are sauna stones included? A: No, sauna stones are sold separately. You will need approximately 50kg of stones sized Ø10-15cm. We recommend high-quality olivine diabase or peridotite stones.

Q: Is a control panel included? A: No, this heater requires a separate external control unit. A temperature sensor is included for connection to your chosen controller. Compatible Harvia control panels are available separately.

Q: What is the warranty? A: Harvia provides a 1 year warranty for residential/family use and 3 months warranty for commercial use. The warranty covers manufacturing defects and materials. Installation must be carried out by a qualified electrician.

Q: Can I install this outdoors? A: This heater is designed for interior wet area use. For outdoor or barrel saunas, it can be used but appropriate weatherproofing of the sauna structure and electrical connections is essential.

Q: What maintenance is required? A: Minimal maintenance is needed. Rearrange and inspect stones annually (more frequently with heavy use), clean the heater surface with a damp cloth, and check heating elements through the front maintenance hatch periodically.

📥 Downloads & Resources

📄 Product Data Sheet – Complete specifications and dimensions

📄 Installation Manual – Full installation guide with wiring diagrams

📄 Electric Heaters Brochure – Harvia electric heater range overview

🏆 Why Choose the Harvia Virta HL90

• ✅ Finnish Heritage – 75 years of sauna expertise from the world’s leading manufacturer
• ✅ Professional-Grade Build – Robust steel construction designed for frequent, demanding use
• ✅ Abundant Steam – 50kg stone capacity delivers soft, long-lasting steam
• ✅ Extended Lifespan – Separated heating elements significantly outlast conventional designs
• ✅ Effortless Maintenance – Front access hatch enables quick servicing without stone removal
• ✅ Comprehensive Safety – Thermal protection, IPX4 rating, and CE certification
• ✅ Versatile Application – Suitable for home, spa, gym, and commercial installations
• ✅ Manufacturer Warranty – 1 year coverage backed by Harvia’s global support network

🤝 Why Buy from Parts4Tubs

• ✅ UK-based company with local support
• ✅ Fast UK delivery
• ✅ Expert advice from sauna and spa specialists
• ✅ Competitive pricing
• ✅ Full warranty support
• ✅ Easy returns within 30 days

✨ Summary

The Harvia Virta HL90 9kW Black Sauna Heater delivers Finnish engineering excellence for sauna rooms between 8 and 14 m³. With its 50kg stone capacity, separated heating elements, and front maintenance hatch, it provides abundant soft steam with exceptional durability and ease of servicing. CE certified and backed by Harvia’s 1 year warranty, the Virta HL90 is the ideal choice for discerning home owners and commercial operators seeking reliable, professional-grade performance. Order today from Parts4Tubs for fast UK delivery and expert support.