The Harvia Club K15G is a 15 kW commercial-grade electric sauna heater built for large sauna rooms between 600 and 989 cubic feet. Designed for high-frequency use in spas, gyms, hotels, and health clubs, it features an all-stainless steel body with extra heavy-duty Incoloy heating elements engineered for sustained performance under demanding conditions. With a 135 lb stone capacity, floor-standing installation, and compatibility with both digital and mechanical external control systems (sold separately), the K15G delivers consistent, high-output heat in a durable, serviceable package. Available in 240V single-phase and 208V three-phase configurations. UL Listed and manufactured in Finland by Harvia.
Why Customers Choose This Heater
- 15 kW output for large sauna rooms from 600 to 989 cu. ft.
- Extra heavy-duty Incoloy heating elements for sustained commercial-grade performance
- All-stainless steel body for corrosion resistance and long service life
- 135 lb stone capacity for even heat distribution and consistent steam output
- Available in 240V 1PH and 208V 3PH to match commercial and residential electrical systems
- Compatible with Harvia digital (Xenio CX45) and mechanical (F-2T / FX503) controllers
- Floor-standing design suited to large sauna room layouts
- UL Listed for compliance with North American safety standards
- Manufactured in Finland by Harvia
Product Highlights
15 kW High-Output Performance
The K15G delivers 15 kW (14,400 watts) of heating power, making it well-suited for large sauna rooms between 600 and 989 adjusted cubic feet. It is designed for consistent performance under frequent, high-demand use in commercial and large residential settings.
Extra Heavy-Duty Incoloy Heating Elements
The K15G uses Incoloy heating elements — a nickel-iron-chromium alloy known for high-temperature resistance and durability. These elements are rated for the sustained, high-cycle demands of commercial sauna environments.
All-Stainless Steel Construction
Both the heater body and structural components are constructed from stainless steel, providing strong resistance to corrosion and thermal stress. This build quality supports long service life in the high-humidity conditions of a sauna environment.
135 lb Stone Capacity
The large stone compartment holds up to 135 lbs of sauna-rated stones (approximately 4 boxes, sold separately), providing substantial thermal mass for even heat distribution and consistent steam output throughout the session.
Two Voltage Configurations
The K15G is available in 240V single-phase (for residential and light commercial installations) and 208V three-phase (for commercial facilities with three-phase electrical service). Select the correct variant for your electrical system before ordering.
External Controller Compatibility
The heater is compatible with Harvia's Xenio CX45 digital controller and the F-2T / FX503 mechanical controller system, both sold separately. A contactor/power unit is also required and sold separately. This allows temperature and session timing to be managed from outside the sauna room.
Floor-Standing Installation
The K15G is designed as a floor-standing unit, providing a stable footprint suited to large sauna rooms where wall-mounted heaters would not provide adequate coverage or meet clearance requirements.
UL Listed
The K15G carries UL Listing, confirming it has been tested and evaluated against North American electrical safety standards. This certification is relevant for permit-required commercial and residential installations.
Manufactured by Harvia in Finland
Harvia has been designing and manufacturing sauna equipment in Finland for over 70 years. The Club K15G reflects the same engineering and build standards applied across the full Harvia commercial heater line.
Specifications
| Model | Harvia Club K15G |
|---|---|
| Power Output | 15 kW (14,400 watts) |
| Primary Fuel | Electric |
| Room Volume (Min) | 600 adjusted cu. ft. |
| Room Volume (Max) | 989 adjusted cu. ft. |
| Stone Capacity | 135 lbs / approx. 4 boxes (sold separately) |
| Heating Elements | Extra heavy-duty Incoloy |
| Construction | All stainless steel body and components |
| Installation Type | Floor-Standing |
| Width | 19.875 in (505 mm) |
| Depth | 16.9 in (429 mm) |
| Height | 27.6 in (701 mm) |
| Heater Weight | 60 lbs |
| Shipping Weight (with stones) | 192 lbs |
| Certifications | UL Listed |
| Country of Origin | Finland |
240V 1PH Variant (SKU: 120-K15G-U1)
| Voltage / Phase | 240V / Single Phase (1PH) |
|---|---|
| Barcode (EAN) | 6417659027656 |
208V 3PH Variant (SKU: 120-K15G-U1)
| Voltage / Phase | 208V / Three Phase (3PH) |
|---|---|
| Amperage | 40 Amps |
| Barcode (EAN) | 6417659027649 |
Note: Confirm amperage and breaker sizing for your specific voltage variant with a licensed electrician and the Installation Manual before ordering.
In the Box
- Harvia Club K15G Electric Sauna Heater (15 kW)
- Mounting Hardware
- Installation and User Manual
- UL Certification Label
Sauna stones, external controller, and contactor/power unit are not included and are sold separately. Refer to the Installation Manual for compatible controller models and wiring requirements.
Ideal For
- Commercial sauna rooms in spas, gyms, hotels, and health clubs
- Large residential sauna rooms from 600 to 989 adjusted cubic feet
- Installations requiring a UL Listed heater for permit compliance
- Facilities with three-phase electrical service (208V 3PH variant)
- Residential or light commercial installations on standard single-phase service (240V 1PH variant)
- High-frequency sauna use requiring heavy-duty heating elements and durable construction
Important Information
- Select the correct voltage variant before ordering. The 240V 1PH and 208V 3PH variants are not interchangeable. Confirm your facility's electrical service type with a licensed electrician before purchasing.
- Licensed electrical installation required. This heater must be installed by a licensed electrician in accordance with local electrical codes, the NEC, and the manufacturer's installation manual.
- Dedicated circuit required: The K15G requires a dedicated circuit sized to the amperage and breaker specifications for your selected variant. Do not connect to a shared circuit. Refer to the Installation Manual for full wiring specifications.
- Controller and contactor required: This heater does not include a control system. A compatible Harvia controller and contactor/power unit must be purchased separately and installed per the controller's installation instructions.
- Clearance requirements: Maintain required clearances to combustible materials and sauna benches as specified in the Installation Manual. Improper clearances may create a fire or burn hazard.
- Sauna stones: Use only sauna-rated stones. Do not use river rocks or unrated stones, as they may crack under high heat and cause injury. Approximately 4 boxes of stones are recommended for this model.
- Water and steam: Only pour water over the stones in controlled amounts as directed in the manual. Do not pour water directly onto the heating elements.
The Installation and User Manual included with the heater contains full wiring diagrams, clearance requirements, compatible controller models, and operating instructions.
Frequently Asked Questions
What size sauna room is the K15G designed for?
The K15G is rated for sauna rooms between 600 and 989 adjusted cubic feet. The adjusted cubic footage accounts for room construction materials and insulation. For smaller rooms, the Harvia Club K10G (388–600 cu. ft.) may be more appropriate.
What is the difference between the 240V 1PH and 208V 3PH variants?
The 240V single-phase variant is suited for standard residential and light commercial electrical service. The 208V three-phase variant is designed for commercial facilities with three-phase electrical systems. Both deliver 15 kW of output but require different circuit configurations. Confirm your electrical service type with a licensed electrician before ordering.
What is the difference between the K15G and the K10G?
The K15G delivers 15 kW and is rated for rooms from 600 to 989 adjusted cubic feet. The K10G delivers 10 kW and is rated for smaller rooms from 388 to 600 adjusted cubic feet. The K15G also uses extra heavy-duty Incoloy heating elements, while the K10G uses standard stainless steel elements. Both are UL Listed, floor-standing, and available in 240V 1PH and 208V 3PH configurations.
Does the K15G include a controller?
No. The K15G requires an external controller and a contactor/power unit, both sold separately. Compatible options include the Harvia Xenio CX45 digital controller and the F-2T / FX503 mechanical controller system. Refer to the Installation Manual for compatibility details.
Are sauna stones included?
Sauna stones are not included. The K15G holds up to 135 lbs (approximately 4 boxes) of sauna-rated stones, available separately. Only use stones specifically rated for sauna use — do not use river rocks or unrated stones.
Is the K15G UL Listed?
Yes. The K15G carries UL Listing, confirming it has been tested and evaluated against North American electrical safety standards. This is relevant for permit-required commercial and residential installations.
What are Incoloy heating elements?
Incoloy is a nickel-iron-chromium alloy used in heating elements that require high-temperature resistance and durability. In sauna heaters, Incoloy elements are rated for the sustained, high-cycle demands of commercial use and typically offer a longer service life than standard stainless steel elements under heavy use conditions.
Where is the Harvia Club K15G manufactured?
The K15G is designed and manufactured in Finland by Harvia, which has been producing sauna equipment for over 70 years.
The Harvia Club K15G is a high-output, commercial-grade electric sauna heater for large sauna rooms requiring sustained, reliable performance. If you need a UL Listed, 15 kW unit with Incoloy heating elements, all-stainless steel construction, a large stone capacity, and flexible controller compatibility in either single-phase or three-phase configurations, this is a purpose-built and well-documented option. Select your voltage variant above and order today — the complete heater package ships with full installation documentation included.
Sauna use is a personal wellness practice. Consult a qualified healthcare provider before use if you have any medical conditions, are pregnant, or are taking medications. This product is not intended to diagnose, treat, cure, or prevent any disease or medical condition.