🧖 Harvia Spirit 9kW Electric Sauna Heater with Xenio WiFi Control – 8-14 m³ Capacity

Finnish-crafted elegance meets intelligent control for the ultimate home or commercial sauna experience

♨️ Product Overview

The Harvia Spirit 9kW electric sauna heater represents the pinnacle of Scandinavian sauna engineering, designed and manufactured in Finland by the world’s leading sauna brand. This wall-mounted masterpiece combines stunning curved aesthetics with powerful 9kW output, making it ideal for medium to large sauna rooms between 8 and 14 cubic metres.

What truly sets the Spirit apart is its innovative air ventilation channel design. Discrete channels at the rear of the heater direct cool air from bottom to top, actively protecting your wall structures from excessive heat while dramatically improving airflow throughout the sauna. The result is faster heat-up times, more even temperature distribution, and enhanced safety for both your sauna and your family.

This package includes the Xenio WiFi control system, putting complete sauna control at your fingertips via the MyHarvia mobile app. Whether you’re at home or away, you can schedule sessions, monitor temperature, and ensure your sauna is ready when you are. With its generous 60kg stone capacity creating soft, enveloping steam, the Harvia Spirit delivers an authentic löyly experience that will transform your wellness routine.

✨ Key Features

✅ 9kW Power Output – Delivers rapid, efficient heating for sauna rooms from 8 to 14 m³ with consistent performance

✅ Finnish Design & Manufacture – Crafted in Finland by Harvia, the world’s most trusted sauna brand since 1950

✅ Innovative Airflow Technology – Unique rear ventilation channel protects wall structures and creates even heat distribution

✅ 60kg Stone Capacity – Generous stone volume produces soft, authentic löyly steam for the ultimate sauna experience

✅ Xenio WiFi Control Included – Complete control via touchscreen panel and MyHarvia mobile app from anywhere

✅ Dual Safety Sensors – Independent heater and room temperature monitors prevent overheating automatically

✅ Door Sensor System – Intelligent safety switch ensures remote starting is only possible when sauna is unoccupied

✅ Heat Radiation Protection – Front shield guides steam upward whilst protecting users from direct heat exposure

✅ CE Certified & IPX4 Rated – Fully splash-proof with European conformity certification for peace of mind

✅ 2-Year Manufacturer Warranty – Comprehensive coverage backed by Harvia’s global support network

⚙️ Technical Specifications

Specification	Value
Power Rating	9 kW
Voltage Options	400V 3N~ / 230V 1N~ / 230V 3~
Frequency	50/60 Hz
Fuse Size (400V 3N~)	3 × 16 A
Cable Size (400V 3N~)	5 × 2.5 mm²
Cable Size (230V 1N~)	3 × 10 mm²
Cable Size (230V 3~)	4 × 2.5 mm²
Cable Type	H07RN-F or equivalent
Room Capacity	8 – 14 m³
Dimensions (H × W × D)	687 × 385 × 334 mm
Weight	12 kg
Stone Capacity	55 – 60 kg
Stone Size	Ø 5 – 10 cm (rounded)
Minimum Sauna Height	1900 mm
Mounting Type	Wall-mounted
IP Rating	IPX4 (splash-proof)
Certifications	CE, EAC
Warranty	2 years

📏 Room Sizing Guide

Basic Formula:

1 kW = approximately 1 – 1.5 m³ sauna room volume

Adjustment Factors:

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

💡 Worked Example:

📍 Example Room: 2.5m × 2m × 2.2m

• Base volume: 11 m³
• Glass door (0.8m × 2m = 1.6 m²): +2.4 m³
• Total calculated: 13.4 m³
• This 9kW heater: ✅ Suitable (rated for 8–14 m³)

📍 Log Cabin Example: 2m × 1.8m × 2.1m

• Base volume: 7.56 m³
• Log wall adjustment (+40%): +3.02 m³
• Total calculated: 10.58 m³
• This 9kW heater: ✅ Suitable (rated for 8–14 m³)

💷 Running Costs

Energy Rate Used: £0.2635/kWh (UK Ofgem Price Cap, October–December 2025)

Cost Calculation:

Usage Level	Sessions/Week	Estimated 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 - 4 sessions per week):
9 kW × 300 hours × £0.2635 = £712 per year

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

⚠️ Actual costs depend on your usage patterns, session length, room insulation, and current energy rates. The heater does not run at full power continuously once the sauna reaches temperature.

⚡ Installation Requirements

Electrical Requirements:

Requirement	Specification
Voltage	400V 3N~ (recommended) or 230V 1N~/3~
Fuse Size (400V)	3 × 16 A
Cable Size (400V)	5 × 2.5 mm² H07RN-F
Cable Size (230V 1N~)	3 × 10 mm² H07RN-F
Cable Size (230V 3~)	4 × 2.5 mm² H07RN-F
Dedicated Circuit	Required

Minimum Safety Clearances:

Position	Distance
Front (from combustibles)	80 mm
Side walls	80 mm
Back wall	0 mm (can be mounted directly)
Ceiling	900 mm
Floor (mounting height)	100 – 300 mm

Ventilation Requirements:

• Fresh air intake: Ø 50–100 mm positioned below or beside heater (for gravity ventilation) or above heater (for mechanical extraction)
• Exhaust vent: Ø 100–200 mm positioned low and away from heater
• Air should change 6 times per hour in the sauna room

⚠️ IMPORTANT: Installation must be carried out by a qualified electrician 
in accordance with BS 7671 (IET Wiring Regulations) and local building codes.
Do NOT connect via RCD/RCBO. PVC-insulated cable must NOT be used.

🔒 Safety Features & Certifications

Built-in Safety:

✅ Thermal cut-out protection with manual reset

✅ Dual independent temperature sensors (heater + room monitoring)

✅ Overheat protection with automatic shutdown

✅ Door sensor for safe remote starting (prevents activation when occupied)

✅ Cold wall protection via integrated airflow channels

✅ Heat radiation shield on front panel

✅ Maximum timer auto-shutoff (up to 6 hours for home use)

Certifications:

✅ CE Marked (European Conformity)

✅ EAC Certified

✅ IPX4 Rated (splash-proof protection)

✅ Designed and manufactured in Finland

🎯 Ideal Applications

Application	Room Size	Capacity	Notes
🏠 Home Sauna	8–12 m³	3–5 people	Perfect for dedicated home wellness rooms
🏡 Garden Room Sauna	8–14 m³	3–6 people	Ideal for insulated garden buildings
🪵 Barrel Sauna	8–12 m³	4–6 people	Account for +25% volume adjustment
🧖 Small Spa/Gym	10–14 m³	4–6 people	Commercial-grade durability for light commercial use
🏨 Holiday Let/B&B	8–14 m³	2–6 people	WiFi control ideal for remote property management

🪨 Sauna Stones

• Stone Capacity: 55 – 60 kg maximum
• Recommended Stone Size: Ø 5 – 10 cm diameter (rounded stones only)
• Stones Included: No – sold separately
• Recommended Types: Olivine diabase, peridotite, or olivine volcanic stones
• Replacement Interval: Every 1–2 years with regular use, or annually for heavy use

Stone Loading Tips:

• Place larger stones at the bottom and sides first
• Ensure stones completely cover heating elements (no elements visible)
• Leave air gaps between stones in the centre for optimal airflow
• Never use cracked, fractite, or flat-faced stones

Add 60kg Rounded Sauna Stones

🎛️ Control Options & Accessories

Included Xenio WiFi Control System:

Feature	Specification
Control Type	Digital touchscreen panel + WiFi
Temperature Range	40°C – 90°C (adjustable)
Timer Range	1 – 6 hours (home use) / 1 – 12 hours (commercial)
Pre-Set Timer	0 – 12 hours delay start
App Control	MyHarvia app (iOS & Android)
Additional Controls	Lighting, fan control, temperature calibration
Included Components	Control panel, power unit, temperature sensor, door sensor, 5m data cable

Compatible Accessories:

• Embedding Flange HSP1 – For flush wall mounting installation
• Safety Railing HSP3M – Protective barrier for family and commercial saunas
• Additional Stone Packages – Rounded volcanic sauna stones Ø 5–10 cm

❓ Frequently Asked Questions

Q: What size room will this heater work for? A: The Harvia Spirit 9kW is designed for sauna rooms between 8 and 14 m³. For rooms with glass doors or uninsulated walls, add 25–50% to your volume calculation. Log cabin saunas should multiply base volume by 1.5.

Q: How long does it take to heat up? A: Typically 30–45 minutes to reach optimal bathing temperature (65–80°C), depending on room size, insulation quality, and ambient temperature.

Q: What electrical supply do I need? A: This heater operates on 400V 3-phase (recommended), 230V single-phase, or 230V 3-phase supply. A dedicated circuit with appropriate fusing is required. Professional installation by a qualified electrician is mandatory.

Q: Are sauna stones included? A: No, sauna stones are sold separately. You will need approximately 60kg of rounded volcanic stones (Ø 5–10 cm). We stock compatible rounded sauna stones.

Q: What is the warranty? A: Harvia provides a 2-year manufacturer warranty. The warranty requires professional installation by a qualified electrician. Contact Parts4Tubs for full warranty terms and registration.

Q: Can I control the sauna remotely? A: Yes! The included Xenio WiFi control system connects to your home WiFi and the MyHarvia app, allowing you to start, monitor, and schedule sauna sessions from anywhere. The door sensor ensures safe remote operation.

Q: Can I install this outdoors? A: This heater is designed for indoor installation within a properly constructed and insulated sauna room. It can be installed in garden sauna buildings that have appropriate weather protection and insulation.

📄 Downloads & Resources

📄 Product Leaflet (English) – Features, specifications, and design overview

📄 Installation Manual – Complete installation guide with wiring diagrams and clearance specifications

🏆 Why Choose the Harvia Spirit 9kW

✅ Finnish Heritage – Designed and manufactured in Finland by the world’s most trusted sauna brand

✅ Innovative Safety – Dual temperature sensors, door detection, and cold wall protection keep your family safe

✅ Smart Control – Full WiFi connectivity lets you manage your sauna from anywhere via the MyHarvia app

✅ Authentic Experience – 60kg stone capacity delivers soft, genuine löyly steam like traditional Finnish saunas

✅ Elegant Design – Curved contemporary styling complements any sauna interior

✅ Proven Reliability – CE certified with 2-year Harvia warranty backed by global support

🤝 Why Buy from Parts4Tubs

✅ UK-based company with expert local support

✅ Fast UK delivery from our Northamptonshire warehouse

✅ Expert advice from dedicated sauna and spa specialists

✅ Competitive pricing on genuine Harvia products

✅ Full manufacturer warranty support and registration

✅ Easy returns within 30 days

✅ Genuine spare parts and accessories available

⭐ Summary

The Harvia Spirit 9kW with Xenio WiFi Control delivers Finnish-engineered excellence for sauna rooms between 8 and 14 m³. Combining innovative airflow technology, dual safety sensors, and smart app control, this wall-mounted heater offers the perfect balance of performance, safety, and convenience. With its generous 60kg stone capacity producing authentic löyly steam and elegant curved design, it’s the ideal choice for discerning home users and light commercial applications. Backed by Harvia’s 2-year warranty and Parts4Tubs expert UK support, order today for fast delivery.