A full rock basket, not a hot metal box
A 110-132 lb Spirit stone load surrounds the elements. That thermal mass smooths the heat and turns every ladle of water into dense, soft steam instead of a sharp blast.
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Harvia Spirit
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Harvia · Made in Finland · ETL / CSA listed
Harvia Spirit sauna heater
Soft, rolling steam from a 110-132 lb stone basket. The wall-mounted rock-basket heater we recommend most for DIY sauna builds.
The Spirit surrounds protected heating elements with a full basket of stones, so the heat lands gentle instead of harsh and the elements avoid direct stone contact. Pair it with the Fenix controller and the temperature sensor reads bench level, where you actually sit.
From $1,715 heater-only · free US shipping
| Size | SKU | Heater price | Room fit |
|---|---|---|---|
| 6 kW | SP60E | $1,715 | 177-282 cu ft - compact rooms up to about 6 x 7 ft |
| 8 kW | SP80E | $1,777 | 250-425 cu ft - the sweet spot for most DIY builds |
| 9 kW | SP90E | $1,930 | 283-494 cu ft - large rooms or glass-heavy walls |
Buy the Harvia Spirit — secure checkout Design with Harvia Spirit in 3D
- Free shipping in the continental US
- ETL listed to UL 875 (USA) and CSA (Canada)
- Extra 3rd-year warranty free with registration
- US-based support through Sauna Marketplace
- Ships from the Chicago distribution center
Some of the most pleasant steam we have experienced
We throw water on a lot of heaters. The Spirit produces loyly that is gentle, even, and quick to recover between rounds - the authentic Finnish feel most DIY builders are chasing.
Elements protected from stone contact
Spirit keeps stones off the heating elements, reducing the direct contact stress that can shorten element life on open rock-basket heaters.
Fenix measures heat where you sit
The latest Harvia Fenix controller package adds a temperature sensor by the bench, so it controls the conditions where it matters - not just above the heater. Wi-Fi start and scheduling via the MyHarvia app.
Harvia is the smart choice
The world’s largest sauna heater manufacturer, building heaters in Finland since 1950. ETL listed for the US, CSA for Canada, with US-based support through Sauna Marketplace.
Harvia Spirit is a wall-mounted heater from Harvia for 177-494 cu ft adjusted sauna rooms. Key planning facts: 6-9 kW output, 110-132 lbs stone capacity, and 74.8" minimum finished ceiling guidance, and controller guidance: Harvia external control package, by SKU.
Design with Harvia Spirit Buy in North America at Sauna Marketplace
Quick answers
What is Harvia Spirit?
Harvia Spirit is a wall-mounted heater from Harvia with 6-9 kW output and 110-132 lbs stone capacity.
What sauna room size fits Harvia Spirit?
The published adjusted room-volume range is 177-494 cu ft. Add glass, tile, stone, brick, concrete, or log exposure before choosing the final kW row.
What clearances does Harvia Spirit need?
Plan 2.36"-3.15" side/back clearance, 2.36"-3.15" front clearance, and a 74.8" minimum finished ceiling check before placing benches or glass.
Which controller works with Harvia Spirit?
Current controller guidance: Harvia external control package, by SKU. Match the controller, relay or power unit, and voltage to the selected kW row before ordering.
Does Harvia Spirit use a GFCI or GFI breaker?
For the heater power feed, the Spirit manual says not to connect through an RCD, the manual term for residual-current/ground-fault protection. In North America, have the electrician verify the selected Spirit/Fenix/Xenio package against NEC and the local AHJ before choosing the final breaker.
Where should I start with Harvia Spirit?
Use the 3D designer to validate the room, benches, openings, clearances, and material schedule, then use Sauna Marketplace for the current package and buying path.
Harvia Spirit size and clearance table
| Variant | Power | Room volume | Dimensions | Rocks | Side/back | Front | Minimum ceiling | Controller |
|---|---|---|---|---|---|---|---|---|
| SP60 / HSPE604MHSPE604M / HSP604MXW | 6 kW | 177-294 cu ft | 15.2" W x 13.2" D x 27.1" H | 110 lb | 2.36" | 2.36" | 74.8" | Harvia external control package, by SKU |
| SP80 marketplace packageSP80 package: confirm selected Spirit manual/SKU | 8 kW | 250-431 cu ft | 15.2" W x 13.2" D x 27.1" H | 110 lb | 3.15" | 3.15" | 74.8" | Harvia external control package, by SKU |
| SP90 / HSPE904MHSPE904M / HSP904MXW | 9 kW | 283-494 cu ft | 15.2" W x 13.2" D x 27.1" H | 110 lb | 3.15" | 3.15" | 74.8" | Harvia external control package, by SKU |
Best fit
- 6-9 kW Harvia heater family for 177-494 cu ft adjusted hot rooms.
- Wall-mounted layouts where the heater footprint, front clearance, and bench approach are planned before ordering.
- 110-132 lbs stone capacity with Harvia external control package, by SKU controller guidance.
- Rooms that can meet the 74.8" minimum finished ceiling check for the selected size row.
- Wall blocking, cladding buildup, and heater bottom height should be resolved before paneling goes in.
Designer checks
- Size the room by adjusted volume, including the 3.94 cu ft per sq ft (1.2 m3 per 1 m2) for glass, stone, tile, brick, concrete, or similar cold surfaces rule where it applies.
- Validate side/back clearance 2.36"-3.15", front clearance 2.36"-3.15", and bench setback before finalizing benches.
- Check the 74.8" minimum finished ceiling against the room height.
- Carry the selected Harvia external control package, by SKU package into the material schedule and heater placement notes.
- Keep the supply stream out of the Spirit temperature-sensor airflow path; high supply is reserved for mechanical ventilation mode.
- If a raised floor, lower bench opening, or safety rail is used, verify the HSP1/HSP3M Spirit accessory sheet before ordering.
- Keep the North American Spirit top safety function free to move; do not block it with stones or accessories.
Package notes
- Harvia Spirit heater body with wall bracket
- 110-132 lb; Harvia R-991 Round Olivine Diabase Stones for Spirit; verify final quantity with selected Spirit SKU
- Vendor-supplied contactor/power unit in selected Xenio/Fenix control package
- Harvia R-991 Round Olivine Diabase Stones for Spirit
- Harvia Spirit HSP3M Safety Railing / Shield
Manual-backed facts
Source
Harvia Spirit installation manual
source: Harvia Spirit installation manual/specification (HSPE/HSP-MXW Y05-1112, North American Spirit owner/operator Y05-1238, HSP1 flange, HSP3M railing; checked May 18, 2026)
Mounting
Wall-mounted
Floor clearance shows the minimum bottom height where the manual lists one.
Model numbers
HSPE604M / HSP604MXW / SP80 package: confirm selected Spirit manual/SKU / HSPE904M / HSP904MXW
Useful when the store name and manual model number are not identical.
Room volume range
177-494 cu ft
Use adjusted sauna volume after cold surfaces, not just geometric room volume.
Cold-surface adder
3.94 cu ft per sq ft (1.2 m3 per 1 m2) for glass, stone, tile, brick, concrete, or similar cold surfaces
The calculator applies the brand-family coefficient before selecting a heater size.
Minimum finished ceiling
74.8"
Computed from body height, floor clearance, top clearance, and the manual minimum room height.
Maximum room height
Not listed for these sizes
Verify with the selected manual when designing unusually tall rooms.
Electrical/control
240V 1PH package; confirm selected SKU; Harvia external control package, by SKU
Use the selected kW row and SKU when matching breakers, phases, relays, and controller packages.
Critical differences
Use rounded 5-10 cm Spirit stones; use HSP1 embedding flange or HSP3M safety railing only as the selected accessory allows Confirm the selected 8 kW Spirit package manual/SKU before ordering; keep the same Spirit ventilation, sensor, stone, and accessory checks in the documents
6 more notes shown below.
Spirit ventilation
6 ACH; passive default
Natural supply under or next to the heater for Spirit layouts; keep supply airflow from cooling the temperature sensor. SaunaDesignPro passive default uses a high adjustable outlet on the opposite wall/corner; switch to mechanical mode when using a low exhaust.
Spirit stones
Round 5-10 cm olivine diabase
Verify the final stone quantity with the selected package: North American Spirit package guidance calls for about 110 lb (50 kg), while HSPE/HSP-MXW rows list 132 lb (60 kg).
Spirit accessories
HSP1 flange / HSP3M railing
When a railing or flange is used, follow the accessory sheet as well as the heater safety distances.
Ground-fault feed
Manual says not to feed Spirit through an RCD
RCD is the manual term for residual-current/ground-fault protection; have the electrician reconcile this with NEC and local AHJ requirements.
Spirit safety function
Top safety function on North American packages
Before switching on or restarting a timer, confirm no objects are on top of the heater or inside the safety distance.
- Use rounded 5-10 cm Spirit stones; use HSP1 embedding flange or HSP3M safety railing only as the selected accessory allows
- Confirm the selected 8 kW Spirit package manual/SKU before ordering; keep the same Spirit ventilation, sensor, stone, and accessory checks in the documents
- Spirit 6 kW and 9 kW sizes match the HSPE/HSP-MXW manual; the 8 kW package still needs selected SKU/manual confirmation.
- Spirit ventilation: SaunaDesignPro now defaults to passive Finnish-style ventilation: low supply under or beside the heater with a high adjustable outlet opposite. Mechanical mode remains available for high supply above the heater and low exhaust when a fan-assisted path is designed.
- Spirit sensor protection: keep supply airflow from cooling the temperature sensor; use the manual vent-to-sensor distance zones when locating high supply air.
- Spirit stones: Use rounded olivine diabase sauna stones, diameter 5-10 cm, per the Spirit product/manual guidance. Verify the final stone quantity with the selected package: North American Spirit package guidance calls for about 110 lb (50 kg), while HSPE/HSP-MXW rows list 132 lb (60 kg).
- Spirit safety: North American Spirit packages include a top safety function; keep its movement clear and do not block it with stones or accessories. Before switching on or restarting a timer, confirm no objects are on top of the heater or inside the safety distance.
- HSP1 embedding flange is the approved Spirit embedding flange accessory. HSP3M safety railing is the approved Spirit safety railing accessory.