💨 Harvia HGD90XW 9kW WiFi Steam Generator – 3-17 m³ Capacity

Commercial-grade Finnish steam power with intelligent WiFi control for larger home spas and professional wellness facilities

♨️ Product Overview

The Harvia HGD90XW represents the sweet spot in the HGD range—powerful enough for serious commercial applications whilst remaining practical for larger residential installations. Delivering an impressive 12 kg/hour of soft, enveloping steam, this 9kW unit transforms spaces from 3 to 17 cubic metres into professional-quality steam environments.

Engineered for 24/7 heavy-duty spa operation, the HGD90XW features Harvia’s signature robust construction with a large water container that supports extended sessions and high-frequency use. The titanium heating elements are specifically designed to withstand mineral-rich water conditions, ensuring consistent performance in demanding commercial environments where reliability is non-negotiable.

The included Harvia Xenio WiFi touchscreen controller brings intelligent management to your steam room operation. Connect via the MyHarvia app to start sessions remotely, monitor temperatures in real time, and control multiple generators from a single interface—ideal for spa complexes managing several treatment rooms. After 75 years perfecting heat technology, Harvia delivers steam room excellence that professionals trust.

🌟 Key Features

✅ 12 kg/h Steam Output – High-capacity steam generation fills larger rooms rapidly and maintains consistent humidity even with frequent door openings

✅ MyHarvia WiFi Connectivity – Remote smartphone control lets you prepare steam rooms before arrival and monitor operations from anywhere

✅ Commercial-Grade Construction – Large water container and heavy-duty components designed for continuous 24/7 professional spa operation

✅ Titanium Heating Elements – Premium corrosion-resistant elements ensure extended service life in hard water conditions and intensive use environments

✅ Stainless Steel Housing – Durable, easy-clean exterior maintains its professional appearance through years of demanding operation

✅ Xenio WiFi Touchscreen – Comprehensive control panel manages temperature, timing, delay start, lighting, ventilation, and fragrance pump intensity

✅ Multi-Generator Control – Serialise multiple HGD units to manage entire spa complexes from a single control panel

✅ Three-Phase Power – 400V 3N~ connection provides reliable, efficient power delivery for commercial installations

✅ Modular Component Design – All serviceable parts including heating elements, circuit boards, and valves are replaceable and cross-compatible with other Harvia models

✅ Auto-Drain Compatible – Optional automatic discharge valve enables hands-free maintenance and prevents limescale buildup

✅ Aromatherapy Integration – Connect optional fragrance pump for enhanced wellness experiences with adjustable scent intensity

✅ CE & EAC Certified – Full European compliance ensures safety and quality across all commercial applications

📊 Technical Specifications

Specification	Value
Model	HGD90XW
Power Rating	9 kW
Steam Output	12 kg/hour
Voltage	400V 3N~ (primary) / 230V 1N~ (alternative)
Fuses (400V 3N~)	3 × 16 A
Fuse (230V 1N~)	40 A
Supply Cable (400V 3N~)	5 × 2.5 mm²
Supply Cable (230V 1N~)	3 × 10 mm²
Electrical Frequency	50/60 Hz
Room Capacity	3–17 m³ (varies by construction)
Dimensions (H × W × D)	435 × 460 × 220 mm
Weight (Empty)	11.8 kg
Water Inlet Pressure	2.0–4.0 bar
Water Inlet Connection	G¾” male
Drain Connection	G½” female
Temperature Range	30–55 °C
Timer Range	10 minutes–24 hours
Delay Start	10 minutes–12 hours
Ambient Temperature Range	10–30 °C
Max Light Connection	100 W
Max Fan Connection	100 W
Max OUT1/OUT2 Power	50 W each
IP Rating	IPX2
Certifications	CE, EAC
Control Panel	Xenio WiFi Touchscreen
Sensor Cable Length	5 m
Control Unit Cable Length	5 m
Package Dimensions	500 × 220 × 580 mm
Gross Weight	14.6 kg
User Group	Professionals
Warranty (Domestic)	2 years
Warranty (Commercial)	1 year
EAN	6417659030977

🏠 Room Sizing Guide

Principle: The Harvia HGD90XW at 9kW is designed for steam rooms between 3 and 17 cubic metres, with exact capacity depending significantly on wall construction, insulation, and ventilation configuration.

Official Harvia Room Size Recommendations:

Wall Construction Type	Recommended Room Size
Light wall (acrylic, etc.) – ventilated	3–8 m³
Tiled lightweight wall	6–12 m³
Standard tiled wall	4.5–10 m³
Tiled lightweight wall (unventilated)	7.5–14 m³
Tiled stone/masonry wall	9–17 m³

Adjustment Factors:

Condition	Adjustment
Glass walls or doors	Add 1 m³ per m² of glass
Natural stone surfaces	Add 25–35% to total volume
High ceilings (above 2.4m)	Calculate additional volume
Poor insulation	Add 25–30% to total volume
Non-insulated masonry/concrete	Double the calculated volume
Frequent door opening (commercial)	Reduce effective capacity by 15–20%

Worked Example:

📍 Example Room: 2.5m × 2.5m × 2.4m (commercial treatment room)

• Base volume: 15.0 m³
• Full-height glass panel (2.5m × 2.4m = 6.0 m²): +6.0 m³
• Total calculated: 21.0 m³
• HGD90XW 9kW: ⚠️ Exceeds capacity—consider HGD110XW or HGD150XW

📍 Example Room: 2.2m × 2.0m × 2.3m (larger home steam room)

• Base volume: 10.12 m³
• Fully tiled walls, standard construction
• Total calculated: 10.12 m³
• HGD90XW 9kW: ✅ Ideal sizing with good capacity margin

📍 Example Room: 3.0m × 2.0m × 2.5m (small gym steam room)

• Base volume: 15.0 m³
• Tiled walls, glass door (0.9m × 2.1m = 1.89 m²): +1.89 m³
• Commercial use factor (frequent access): Consider 15% reduction in effective capacity
• Total calculated: 16.89 m³
• HGD90XW 9kW: ✅ Suitable for tiled/stone construction

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💷 Running Costs

Energy Rate Used: £0.245/kWh (UK average December 2024—verify current rates at Ofgem)

Cost Calculation Table:

Usage Level	Sessions/Week	Est. Hours/Year	Annual Cost
🏠 Regular Home Use	4 × 30 min	~104	£229
🧖 Heavy Home Use	6 × 45 min	~234	£516
🏋️ Light Commercial	15 × 45 min	~585	£1,290
🏨 Medium Commercial	25 × 45 min	~975	£2,150

Calculation Formula:

Annual Cost = kW × Hours/Year × £0.245

Example (HGD90XW, Regular Home Use - 4 sessions/week × 30 min):
9 kW × 104 hours × £0.245 = £229.32

Per session cost (30-minute session):
9 kW × 0.5 hours × £0.245 = £1.10

Per session cost (45-minute commercial session):
9 kW × 0.75 hours × £0.245 = £1.65

💡 Commercial Efficiency Tip: The WiFi scheduling function allows you to programme warm-up times to coincide with opening hours, eliminating energy waste. The rapid 12 kg/h steam output means shorter warm-up periods compared to lower-powered units.

⚠️ Actual costs depend on usage patterns, session length, room size, insulation quality, and current energy rates.

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⚡ Installation Requirements

Electrical Requirements:

Requirement	400V Three-Phase (Recommended)	230V Single-Phase
Voltage	400V 3N~	230V 1N~
Fuse Rating	3 × 16 A	40 A
Cable Size	5 × 2.5 mm²	3 × 10 mm²
Dedicated Circuit	Required	Required
RCD Protection	Required	Required

⚠️ Note: Three-phase 400V connection is the primary recommended configuration for this unit. Single-phase installation requires a 40A supply and heavier cabling.

Location Requirements:

Requirement	Specification
Installation Location	Dry interior space only
Ambient Temperature Range	10–30°C
Storage Temperature Range	0–50°C
Mounting Position	Wall-mounted, vertical orientation
Safety Distance (Side)	250 mm minimum
Safety Distance (Ceiling)	200 mm minimum
Safety Distance (Floor)	150 mm minimum
Installation Opening	Minimum 1m × 1m access
Ventilation	Adequate airflow if enclosed in cabinet
Floor Drain	Required for discharge water

Steam Pipe Installation:

• Minimum internal diameter: 15 mm
• Material: Copper pipe recommended
• Steam nozzle height: 100–300 mm above floor
• Seal pipe entry with silicone
• Multiple nozzles recommended for rooms >12 m³

Temperature Sensor Placement:

• Install on steam room ceiling or wall
• Height: 1,700–3,000 mm above floor level
• Sensor cable length: 5 metres supplied
• Keep away from supply air vents and steam nozzles

⚠️ IMPORTANT: Installation must be carried out by a qualified electrician 
and plumber in accordance with BS 7671 (IET Wiring Regulations), 
Water Supply Regulations, and local building codes. The generator must 
not be installed where it may freeze or be exposed to harmful substances.
Never install directly above floor drain—rising steam can damage electronics.
Commercial installations may require Building Regulations approval.

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💧 Water Requirements

Water Supply:

Requirement	Specification
Water Pressure	2.0–4.0 bar
Flow Rate	8–12 litres/minute recommended
Inlet Connection	G¾” male thread
Water Type	Cold mains water
Stop Valve	Required on supply line

Drainage:

Requirement	Specification
Drain Connection	G½” female thread
Drain Type	Gravity drainage to floor drain
Auto-Drain Valve	Optional accessory (recommended for commercial)
Floor Drain	Required (do not install directly above)

Water Quality Recommendations:

Parameter	Recommended Level
Manganese (Mn)	<0.05 mg/l
Calcium (Ca)	<100 mg/l
Chloride	<12 mg/l
Copper	<0.2 mg/l
Overall Hardness	Soft water preferred

💧 Commercial Water Treatment: For professional installations with high usage, a dedicated water softener system is essential. Hard water significantly accelerates limescale buildup on heating elements, reducing efficiency and shortening component life. The automatic discharge valve (optional) combined with soft water provides optimal maintenance-free operation.

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🔒 Safety Features & Certifications

Built-in Safety Systems:

• ✅ Low water level protection with automatic water intake
• ✅ Overpressure relief valve (never obstruct)
• ✅ Overheat protection circuit
• ✅ Programmable auto-shutoff timer (maximum 24 hours)
• ✅ Temperature regulation via external sensor
• ✅ Splash-proof construction (IPX2 rated)
• ✅ Power failure memory function (configurable: ON1, ON2, or OFF)
• ✅ Control panel lock function

Certifications:

• ✅ CE Marked—European Conformity
• ✅ EAC Certified—Eurasian Conformity
• ✅ IPX2 Rated—Protected against water drops when tilted up to 15°

Commercial Safety Considerations:

⚠️ Steam nozzles, pipes, and connections become scalding hot during operation—install protective barriers in public areas

⚠️ Steam output is boiling hot—position nozzles to avoid direct contact with seated users

⚠️ Never block or obstruct the overpressure valve under any circumstances

⚠️ Display appropriate safety signage in commercial steam rooms

⚠️ Ensure emergency stop controls are accessible in professional installations

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🎯 Ideal Applications

Application	Room Size	Typical Users	Suitability
🏠 Large Home Steam Room	8–14 m³	3–5 people	✅ Ideal
🧖 Private Spa Suite	10–15 m³	4–6 people	✅ Ideal
♨️ Hammam	9–17 m³	5–8 people	✅ Ideal
🏋️ Gym Steam Room	10–15 m³	6–8 people	✅ Suitable
🏨 Hotel Spa Steam Room	8–14 m³	4–6 people	✅ Ideal
💆 Day Spa Treatment Room	6–12 m³	2–4 people	✅ Ideal
🏢 Corporate Wellness	10–16 m³	6–10 people	✅ Suitable

Best Suited For:

• Larger residential steam room installations
• Boutique hotel and resort spa facilities
• Gym and fitness centre steam rooms
• Day spa and wellness centre treatment rooms
• Private hammam and Turkish bath installations
• Corporate wellness facilities
• Properties requiring commercial-grade durability with smartphone control

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🎛️ Control Options & Accessories

Included Control System:

The Harvia Xenio WiFi touchscreen control panel comes as standard:

• Display: Touch-sensitive interface with LED indicators
• Temperature Control: 30–55°C adjustable range
• Timer: 10 minutes to 24 hours continuous operation
• Delay Start: 10 minutes to 12 hours pre-programming
• Lighting Control: Up to 100W external lighting circuit
• Fan Control: Up to 100W ventilation fan circuit
• Additional Outputs: 2 × 50W auxiliary connections
• Fragrance Control: Variable intensity (when pump connected)
• Ventilation/Dehumidifying: ON, OFF, or DRY mode (60-minute cycle)
• WiFi Connectivity: MyHarvia app for iOS and Android
• Multi-Unit Control: Manage multiple steam generators from single panel
• Panel Lock: Prevents unauthorised adjustments
• Sensor Cable Length: 5 metres
• Control Unit Cable Length: 5 metres

Compatible Optional Accessories:

• Automatic discharge valve – Essential for commercial installations; enables programmable self-flushing
• Fragrance pump – Delivers aromatherapy directly into steam output with variable intensity
• Additional steam nozzles – Recommended for rooms >12 m³ or L-shaped layouts
• Water softener – Critical for hard water areas and commercial installations
• External lighting – Create atmospheric illumination controlled from the panel

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🌿 Aromatherapy

The HGD90XW fully supports professional aromatherapy integration:

• Integration: Direct connection to Xenio WiFi control panel
• Intensity Control: Variable fragrance strength adjustable via touchscreen or app
• Operation: Fragrance is injected into the steam pipe near the nozzle
• Commercial Use: Programmable dosing for consistent client experiences
• Oil Type: Water-soluble essential oils recommended
• Popular Commercial Fragrances: Eucalyptus, menthol, lavender, pine, citrus, mint, rosemary

💡 Commercial Tip: For spa settings, consider rotating fragrance selections throughout the day or offering clients a choice of aromatherapy experiences. The variable intensity control allows you to match scent strength to room size and client preferences.

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❓ Frequently Asked Questions

Q: What size steam room will this generator heat? A: The HGD90XW is suitable for steam rooms between 3 and 17 cubic metres, depending on wall construction. Standard tiled rooms work optimally in the 6–14 m³ range. For rooms with extensive glass, natural stone, or high ceilings, reduce the maximum capacity accordingly or consider the HGD110XW.

Q: Is this suitable for commercial use? A: Yes, the HGD90XW is classified by Harvia as a “Professional” grade product. It features heavy-duty construction with a large water container designed for 24/7 spa operation. For very high-traffic commercial applications, consider the HGP series with built-in auto-drain and fragrance pump.

Q: How quickly does it produce steam? A: With 12 kg/hour steam output, the HGD90XW produces steam rapidly—typically within 15–25 minutes for appropriately sized rooms. Larger rooms or those with glass/stone construction may require slightly longer warm-up times.

Q: What electrical supply is required? A: The recommended configuration is 400V three-phase (3 × 16A fuses, 5 × 2.5 mm² cable). Single-phase 230V installation is possible but requires a substantial 40A supply with 3 × 10 mm² cabling. A qualified electrician must assess your supply capacity.

Q: Can I control multiple steam rooms from one panel? A: Yes, HGD steam generators can be serialised to manage multiple units from a single Xenio control panel. This is ideal for spa complexes with several treatment rooms, allowing centralised monitoring and control.

Q: Is a water softener necessary? A: For commercial installations, a water softener is strongly recommended regardless of local water hardness. For residential use in soft water areas (<100 ppm calcium), it’s optional but beneficial. In hard water areas, it’s essential for both applications.

Q: What maintenance is required? A: Regular descaling based on usage and water hardness. Commercial installations should use the optional automatic discharge valve for hands-free maintenance. Empty and clean the sediment cup periodically. Heating elements and other components are designed for easy replacement when needed.

Q: What warranty coverage is provided? A: Harvia provides a 2-year warranty for domestic/private use and a 1-year warranty for commercial applications. All major components are replaceable, ensuring long-term serviceability.

📥 Downloads & Resources

 Harvia HGD XW Installation & User Manual – Complete installation guide with wiring diagrams, technical specifications, and operating instructions (available in English, German, French, Italian, Dutch, Spanish, Swedish, and Finnish

⭐ Why Choose the Harvia HGD90XW

• ✅ Serious Steam Power – 9kW output with 12 kg/h steam generation handles demanding commercial environments and larger residential rooms
• ✅ Professional Classification – Harvia designates this unit for “Professionals”—built for heavy-duty 24/7 spa operation
• ✅ Finnish Engineering Legacy – 75 years of Harvia expertise ensures reliability when your reputation depends on it
• ✅ Smart Spa Management – WiFi control and multi-unit serialisation simplifies operations for spa complexes
• ✅ Titanium Durability – Premium heating elements resist mineral buildup for extended service life
• ✅ Modular Serviceability – All key components are replaceable, ensuring decades of economical operation

🇬🇧 Why Buy from Parts4Tubs

• ✅ UK-based company with dedicated local customer support
• ✅ Fast UK delivery on in-stock items
• ✅ Expert advice from experienced steam room and spa specialists
• ✅ Competitive pricing with price-match commitment
• ✅ Full manufacturer warranty support and after-sales service
• ✅ Commercial project consultation available
• ✅ Easy returns within 30 days for complete peace of mind

✨ Summary

The Harvia HGD90XW 9kW WiFi steam generator delivers commercial-grade performance for steam rooms up to 17 m³. With powerful 12 kg/hour steam output, smartphone control via the MyHarvia app, and durable titanium heating elements, this professional-classified unit is ideal for larger home spas, gym facilities, hotel wellness centres, and day spa treatment rooms. The multi-generator serialisation capability makes it the smart choice for spa complexes requiring centralised control. Backed by Harvia’s 75-year reputation for Finnish quality and Parts4Tubs’ expert UK support, the HGD90XW is built for demanding applications where reliability matters. Order today for fast delivery.