SaunaNews
The Sauna Industry's Record of Note
Wall-mount residential heater with 110 lbs of stone and WiFi
Sculptural curved rock basket, UL 875 certified, WiFi-ready through MyHarvia. The heater specialty dealers recommend most for 6x6 and 6x8 rooms.
The Spirit is Harvia's residential sweet spot. A sculptural wall-mount form with a 110-pound stone capacity, two independent safety sensors, and standard WiFi through the MyHarvia app. It shows up in most 6x6 and 6x8 residential saunas sold through US specialty dealers. Designed and manufactured in Finland and certified to UL 875 for US and Canadian installations. Three models: SP60 (6 kW), SP80 (8 kW), SP90 (9 kW), all on standard 240V single-phase.
On this page
Editorial status
SaunaNews is independent and not affiliated with Harvia. This page is maintained as a product record for news coverage and timeline context, not a sales page.
Last timeline mention: February 12, 2026 · Q4 2025 press release — Black Friday campaign volume
Power range
6, 8, 9 kW
Stone capacity
~110 lbs
Room size
170 – 460 cu ft
Max temperature
194°F
Voltage
240V 1PH
Certification
UL 875 (US + Canada)
| Model | Power | Room size | Stones | Voltage | Notes |
|---|---|---|---|---|---|
| SP60 | 6 kW | 170 – 300 cu ft | ~110 lbs | 240V 1PH | — |
| SP80 | 8 kW | 212 – 388 cu ft | ~110 lbs | 240V 1PH | — |
| SP90 | 9 kW | 282 – 459 cu ft | ~110 lbs | 240V 1PH | — |
From earnings calls, investor presentations, annual reports, and the Harvia product catalog.
1 of 2 quotes include a direct source link.
“The Harvia Spirit sauna heater, inspired by the earth's natural materials, brings you closer to nature while enjoying the healing power of sauna heat.”
“The gently curved body of the heater is designed to use rounded stones, seamlessly fusing the beauty of nature with an elegant handmade design.”
Some older quotes do not have a direct public URL in this record yet. We keep them for timeline completeness and update links as primary sources are located.
Practical guidance from specialty dealers, commercial installers, and long-term Harvia operators. Use these notes alongside the official manual.
For 6x6 and 6x8 residential saunas (roughly 170 to 300 cubic feet), Spirit is usually the right Harvia option. Wall-mount saves bench-area footprint vs a floor-standing Cilindro, and 110 lbs of stones is sufficient for residential-intensity use. Step up to Cilindro primarily when the room is significantly larger or when the customer specifically wants the visible stone column as a design element.
Spirit uses two safety sensors, one on the heater itself and one mounted in the sauna room. Incorrect placement of the room sensor is a common cause of nuisance high-limit trips at otherwise normal session temperatures. Install per Harvia's instructions, and if trips occur during normal operation, verify sensor placement and wiring before assuming a hardware fault.
Harvia's room-size spec charts assume tight construction and modest glass area. US residential builds with large glass doors or windows lose heat faster than the nominal spec envelope. If the chart places your room at the boundary between two Spirit sizes (for example, right at SP60's upper limit), consider sizing up to SP80.
Harvia offers an HSP3M wire-frame safety railing that installs over Spirit to prevent contact with stones while allowing airflow. It ships included with some package deals and is available separately otherwise. Worth specifying for saunas in households with children or where the heater is in reach of unfamiliar guests.
Rooms 170-460 cubic feet, standard 240V single-phase residential service, homeowners who want WiFi control out of the box, specialty dealers looking for a reliable mid-range recommendation. The default Harvia for a 6x8 backyard sauna kit.
This is editorial analysis for context, not a purchase recommendation.
Images sourced from the Harvia Media Bank. Product photography, variant shots, technical diagrams, and installation references straight from Harvia Plc.
DiagramMedia Bank of Harvia. Courtesy of Harvia Plc.
Warranty
2 years residential, 1 year commercial
Made in
Muurame, Finland (UL 875 certified for US and Canada)
Launched
Spirit series ~2020; WiFi standard from 2023
Last Harvia mention
February 12, 2026
Q4 2025 press release — Black Friday campaign volume
Vega BC series · entry
Entry-level workhorse — the heater Harvia ships in real volume
Cilindro PC series (electric) · flagship
The cylindrical tower electric heater that made Harvia famous
Xenio CX / Fenix FX · flagship
Smart-control platform: Xenio installed base, Fenix 2025 flagship
Earnings, investor calendar, stock chart, acquisitions timeline, and the rest of the Harvia product catalog live on our main hub.
Go to Harvia News hubA concise weekly briefing on sauna launches, deals, openings, standards, and market shifts.
No spam. Unsubscribe anytime.
Product data is sourced from Harvia Plc investor materials, earnings call transcripts, harvia.com, and harviagroup.com. Quotes are attributed to specific sources when available. Field notes reflect installer and dealer experience and should be validated against local code and the latest Harvia manuals. SaunaNews is independent and not affiliated with Harvia Plc.
If you spot an error or outdated spec, contact the SaunaNews editorial team so the record can be corrected.