Harvia Spirit SP90E: Maximum Power, Modern Design
The Harvia Spirit SP90E is the most powerful heater in the Spirit series, delivering 9 kilowatts of heating power for larger home saunas and commercial installations. Its elegantly curved design and smart connectivity options make it as beautiful as it is capable—a true statement piece that transforms your sauna into a modern wellness sanctuary.
Thoughtful Finnish Design
The Spirit series represents Harvia's vision of what a contemporary sauna heater should be. The curved black steel body flows naturally upward, designed to showcase the beauty of rounded sauna stones rather than hide them behind industrial housing. Every detail reflects Finnish design philosophy: functional, beautiful, and built to last.
Smart Safety Features
Safety is engineered into every aspect of the Spirit SP90E. Dual safety sensors monitor both the heater and sauna room temperature independently, preventing overheating from any source. An integrated weight sensor detects if items are placed on top of the heater, automatically preventing remote start-up—so you can preheat your sauna from anywhere with complete peace of mind.
Wi-Fi Ready Convenience
Connect the Spirit SP90E to a Xenio Wi-Fi control package and manage your sauna from anywhere using the MyHarvia mobile app. Start preheating on your commute home, adjust temperature from your phone, or set schedules that match your routine. The heater is also compatible with standard Xenio wall-mounted controls for those who prefer traditional operation.
Maximum Power for Larger Spaces
With 9 kilowatts of heating power, the SP90E handles sauna rooms from 177 to 494 cubic feet—the largest capacity in the Spirit lineup. This makes it ideal for spacious 3-5 person home saunas or light commercial use. The generous 110-pound stone capacity stores substantial thermal mass for consistent heat and satisfying steam when you pour water over the stones.
Installation Requirements
The Spirit SP90E requires a dedicated 240V circuit with 50-amp breaker and hardwired installation by a licensed electrician. A Xenio series control (sold separately) is required for operation. The heater includes a temperature sensor, wall-mounting bracket, and all necessary mounting hardware. Designed, engineered, and manufactured in Finland. ETL certified for safety. Backed by Harvia's 1-year residential and commercial warranty, plus Sauna Republic's dedicated customer support.
Features
Design & Construction
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Organic Curved Aesthetic — flowing lines showcase rounded stones naturally
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Premium Black Steel — durable finish complements modern sauna interiors
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Wall-Mounted Design — saves floor space while providing optimal heat distribution
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Made in Finland — Finnish engineering and manufacturing quality
Smart Technology
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Wi-Fi Ready — connects to MyHarvia app via Xenio Wi-Fi control package
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Dual Safety Sensors — independent monitoring of heater and room temperature
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Weight Detection — prevents remote start if items placed on heater
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Xenio Compatible — works with full range of Harvia Xenio controls
Performance
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9kW Output — heats rooms from 177-494 cubic feet efficiently
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110 lb Stone Capacity — substantial thermal mass for consistent heat
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Fast Heat-Up — reaches sauna temperature quickly
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Even Heat Distribution — wall-mount position optimizes airflow
Safety & Certification
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ETL Certified — tested and listed for US and Canadian safety standards
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Integrated Safety Functions — multiple protection systems prevent overheating
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1-Year Warranty — covers residential and commercial use
Specifications
Electrical
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Power Output: 9kW (9,000 watts)
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Voltage: 240V AC
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Amperage: 37.5A
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Phase: Single Phase (1PH)
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Breaker Size: 50A recommended
Performance
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Room Capacity: 177–494 cu ft
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Stone Capacity: 110 lbs
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Stone Size: 5–10 cm diameter
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Max Temperature: 194°F (90°C)
Physical
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Dimensions: 15"W × 13.1"D × 29.5"H
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Weight: 28 lbs (heater only)
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Finish: Black
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Material: Black Steel
Installation
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Mount Type: Wall-mount
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Controller: External required (Xenio series)
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Hardwired: Yes (licensed electrician required)
Certifications
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Safety Listing: ETL Certified
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Origin: Made in Finland
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Warranty: 1-year residential / 1-year commercial
What's Included
In the Box
- Harvia Spirit SP90E 9kW Sauna Heater
- Temperature Sensor
- Wall-Mounting Bracket
- Mounting Screws
- Installation and Operation Manual
- 1-Year Limited Warranty Documentation
Required for Operation (Sold Separately)
- Xenio Series Control (CX45-U1 wall-mount or CX45-U3-XW Wi-Fi package)
- 110 lbs sauna stones (4 boxes of Harvia AC3000 5-10cm stones)
- 240V/50A dedicated circuit with hardwired installation
Resources
Documentation available on the product page includes the Harvia Spirit installation and operation manual, data sheet, and warranty terms.
Shipping
Free Shipping to Continental US
Every order ships free to the continental United States. Sauna heaters typically ship via UPS or FedEx and arrive within 1–2 weeks. Tracking information is emailed within 24 hours of shipment.
$250 Damage-Free Delivery Guarantee
If your order arrives damaged, we pay you $250 cash AND ship a free replacement at our expense. Simply photograph any damage within 24 hours of delivery and email info@thesaunarepublic.com to file a claim.
Alaska, Hawaii & Puerto Rico
Free shipping does not apply to these locations. Please contact us at (888) 833-2305 for a custom shipping quote before placing your order.
Returns & Refunds
30-Day Return Policy
Not the right fit? Sauna heaters qualify for our standard return policy:
- Full refund minus 25% restocking fee
- Item must be unused and in original packaging
- Customer arranges and pays return shipping
- 30 days from delivery to initiate return
To start a return, email info@thesaunarepublic.com with your order number. We'll send return instructions within 24 hours.
Final Sale Payment Methods
Important: Purchases made with Shop Pay Installments are final sale and cannot be returned or refunded. Please contact us with any questions before purchasing with this payment method.
Flexible Payment Options
0% APR Financing with Shop Pay
Split your purchase into easy monthly payments with no interest. Pay in 4 interest-free installments, or choose monthly financing for up to 36 months on purchases up to $30,000. Select Shop Pay at checkout to see your personalized options—checking your rate won't affect your credit score.
- No hidden fees or prepayment penalties
- Instant approval decision at checkout
- Rates from 0–36% APR based on creditworthiness
Note: All Shop Pay Installment purchases are final sale and cannot be returned or refunded.
Questions?
Our sauna specialists are available 7 days a week to help with sizing, electrical requirements, controller selection, or any other questions. Call us at (888) 833-2305, email info@thesaunarepublic.com, or book a free consultation through our website. We're here Monday–Sunday, 9am–5pm EST.