♨️ Harvia Senator T9 9kW Sauna Heater – 8-14 m³ Room Capacity

Premium Finnish Floor-Standing Heater Engineered for Extended, Luxurious Sauna Sessions

📋 Product Overview

The Harvia Senator T9 is a premium floor-standing electric sauna heater designed specifically for those who appreciate longer, more indulgent sauna sessions. Manufactured by Harvia Oy in Finland—a company with over 75 years of sauna expertise—this 9kW heater combines traditional Finnish craftsmanship with robust commercial-grade construction.

Featuring a generous 40kg stone capacity and six powerful heating elements, the Senator T9 delivers soft, consistent steam and even heat distribution throughout your sauna room. The heater’s construction is almost entirely stainless steel, ensuring exceptional durability and resistance to the demanding sauna environment.

Ideal for family saunas, small commercial installations, or shared saunas in apartment buildings and terraced houses, the Senator T9 provides the perfect balance of power and sophistication. This heater requires a separate control unit (sold separately), offering flexibility in control placement and operational convenience.

✨ Key Features

✅ Six Heating Elements – Delivers 9kW of powerful, evenly distributed heat for consistent warmth across rooms up to 14 m³

✅ 40kg Stone Capacity – Generous stone chamber provides exceptional thermal mass for soft, gentle steam (löyly) and longer-lasting heat retention

✅ Premium Stainless Steel Construction – Almost entirely built from corrosion-resistant stainless steel for outstanding durability in high-humidity environments

✅ Floor-Standing Design – Stable floor-mounted installation with four adjustable feet for levelling on uneven surfaces

✅ Extended Session Capability – Specifically engineered for prolonged sauna bathing with consistent temperature maintenance

✅ Flexible Control Options – Compatible with a range of Harvia control units including Xenio CX170 with WiFi connectivity

✅ Commercial-Grade Reliability – Suitable for both residential family saunas and light commercial applications in hotels and wellness centres

✅ Finnish Manufacturing Heritage – Designed and manufactured by Harvia Oy in Finland, the birthplace of sauna culture

✅ CE Certified – Meets European safety and performance standards for electrical heating equipment

🔧 Technical Specifications

Specification	Value
Model Number	HSE090400
Power Rating	9 kW
Voltage	400V 3N~ (3-phase)
Circuit Breaker	3 × 16A
Cable Size	5-core, 2.5mm²
Room Capacity	8 – 14 m³
Dimensions (H × W × D)	660 × 465 × 345 mm
Net Weight	17.3 kg
Gross Weight	18.6 kg
Stone Capacity	40 kg
Recommended Stone Size	Ø 5 – 10 cm
Heating Elements	6 × 1500W
Mounting Type	Floor-standing
Main Material	Stainless Steel
Minimum Room Height	1900 mm
Certifications	CE Marked
Warranty	1 year elements / 5 years components

📏 Room Sizing Guide

Standard Formula: 1 kW ≈ 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 accordingly

Worked Example:

📍 Example Room: 2.5m × 2.2m × 2.1m

• Base volume: 11.55 m³
• Glass door (0.8m × 2m = 1.6 m²): +2.4 m³
• Total calculated: 13.95 m³
• Senator T9 9kW capacity: ✅ Suitable for 8–14 m³

This heater is ideally suited for well-insulated indoor sauna rooms. For outdoor installations or saunas with significant glazing, consider whether adjustments bring your effective volume within the 8–14 m³ range.

💷 Running Costs

Energy Rate Used: £0.264/kWh (Ofgem Price Cap, Q4 2025)

Annual Cost Estimates:

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

Per session cost (1.5 hour session): 
9 kW × 1.5 hours × £0.264 = £3.56

⚠️ Actual costs depend on your energy tariff, usage patterns, session length, and room insulation. The heater does not run at full power throughout the entire session—once target temperature is reached, energy consumption reduces significantly.

⚡ Installation Requirements

Electrical Requirements:

Requirement	Specification
Voltage	400V 3N~ (3-phase)
Circuit Breaker	3 × 16A
Cable Size	5-core, 2.5mm² minimum
Dedicated Circuit	Required

Minimum Clearances:

Position	Distance
Front (non-combustible)	50 mm
Sides (non-combustible)	50 mm
Sides (combustible)	50 mm
Rear (non-combustible)	120 mm
Ceiling	1250 mm
Minimum room height	1900 mm

Installation Opening Required: 1900 × 565 × 445 mm (H × W × D)

Ventilation:

• Fresh air intake recommended near floor level, close to the heater
• Exhaust vent positioned opposite the heater, below ceiling level
• Mechanical ventilation optional but recommended for commercial installations

⚠️ IMPORTANT: Installation must be carried out by a qualified electrician in accordance with BS 7671 (IET Wiring Regulations) and local building codes. Three-phase power supply is required for this heater.

🛡️ Safety Features & Certifications

Built-in Safety:

✅ Thermal cut-out protection – automatically shuts down if overheating is detected

✅ High-limit safety switch – prevents dangerous temperature levels

✅ Stainless steel construction – corrosion-resistant and durable in high-humidity environments

✅ Floor-mounted stability – secure installation with adjustable levelling feet

Certifications:

✅ CE Marked – meets European safety, health, and environmental requirements

✅ Manufactured by Harvia Oy, Finland – 75+ years of sauna expertise

🎯 Ideal Applications

Application	Room Size	Capacity	Notes
🏠 Family Home Sauna	8 – 12 m³	2 – 4 people	Perfect for dedicated home sauna rooms
🏨 Hotel/B&B	10 – 14 m³	4 – 6 people	Commercial-grade durability for guest use
🏢 Apartment Building	8 – 14 m³	4 – 6 people	Ideal for shared facilities in residential blocks
🧖 Small Wellness Centre	10 – 14 m³	4 – 6 people	Reliable performance for professional environments
🏡 Terraced House	8 – 12 m³	2 – 4 people	Compact footprint suits smaller installations

🪨 Sauna Stones

• Stone Capacity: 40 kg
• Recommended Stone Size: Ø 5 – 10 cm diameter
• Stones Included: No – sauna stones sold separately
• Recommended Stone Types: Olivine diabase, Vulcanite, Peridotite, or similar high-quality sauna stones
• Replacement Interval: Every 1–2 years with regular use (inspect annually)

💡 Tip: Quality stones are essential for optimal steam production and heat retention. Avoid river rocks or stones that may contain moisture pockets, which can crack or explode when heated.

🎛️ Control Options & Accessories

Control System:

• Type: Requires separate external control panel (not included)
• Compatible Controls: Harvia C150, CS110, CS170, CX110, CX170, Xenio CX170W (WiFi)

Recommended Control Options:

Control Unit	Features
Harvia C150	Timer 0–12 hours, thermostat 40–110°C
Harvia CX170	Digital display, timer, precise temperature control
Harvia Xenio CX170W	WiFi connectivity, MyHarvia app control, remote operation

Compatible Accessories:

• Heater safety rail/guard
• Sauna stones (40kg required)
• Ventilation components
• Sauna room thermometer/hygrometer

❓ Frequently Asked Questions

Q: What size room will this heater work for? A: The Harvia Senator T9 9kW is designed for sauna rooms between 8 and 14 m³. For rooms with glass doors, windows, or uninsulated walls, add 25–50% to your volume calculation to ensure adequate heating capacity.

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

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

Q: Are sauna stones included? A: No, this heater requires 40kg of sauna stones, which are sold separately. We recommend high-quality stones such as olivine diabase or vulcanite for best performance.

Q: What is the warranty? A: Harvia provides a 1-year warranty on heating elements and a 5-year warranty on other heater components. Contact Parts4Tubs for full warranty terms and conditions.

Q: Can I install this outdoors? A: This heater is designed for indoor installation. Outdoor use in a properly constructed sauna building may be possible, but increased heat loss should be factored into room sizing calculations.

Q: Do I need a separate control unit? A: Yes, the Senator T9 does not include built-in controls. A separate Harvia control panel (such as the C150 or Xenio CX170) is required for operation.

📄 Downloads & Resources

📄 Technical Datasheet (PDF) – Complete specifications and dimensions

🏆 Why Choose the Harvia Senator T9

✅ Proven Finnish Quality – Manufactured by Harvia, the world’s leading sauna and spa company with 75+ years of expertise

✅ Commercial-Grade Durability – Stainless steel construction withstands demanding environments and frequent use

✅ Extended Session Design – Specifically engineered for those who appreciate longer, more relaxing sauna experiences

✅ Generous Stone Capacity – 40kg of stones provides exceptional thermal mass for soft, gentle steam

✅ Flexible Installation – Floor-standing design with adjustable feet suits various room configurations

✅ Wide Control Compatibility – Works with standard and WiFi-enabled Harvia control units for modern convenience

🤝 Why Buy from Parts4Tubs

✅ UK-Based Company – Local support and expertise you can rely on

✅ Fast UK Delivery – Quick dispatch and reliable shipping across the UK

✅ Expert Advice – Knowledgeable team available for sizing guidance and technical questions

✅ Competitive Pricing – Great value on genuine Harvia products

✅ Full Warranty Support – We stand behind every product we sell

✅ Easy Returns – Hassle-free returns within 30 days

✨ Summary

The Harvia Senator T9 9kW sauna heater delivers premium Finnish engineering for sauna rooms between 8 and 14 m³. With its substantial 40kg stone capacity, six powerful heating elements, and durable stainless steel construction, it’s the ideal choice for family saunas and light commercial installations where extended, comfortable sessions are valued. Backed by Harvia’s renowned quality and Parts4Tubs’ expert UK support, the Senator T9 represents an excellent investment in authentic sauna wellness. Order today for fast UK delivery.