SaunaNews
The Sauna Industry's Record of Note
The 40 kW commercial wood-fired stove sized for large public saunas
Harvia's largest wood-burning stove. 40 kW rated output, 264 lbs of stone capacity, steel construction, black finish. Rated by Harvia for sauna rooms from 706 to 1,766 cubic feet and designated for professional use.
The Harvia 50 (model WK500) is the largest wood-burning sauna heater in Harvia's current catalog. It is rated at 40 kW output, holds 264.6 lbs of stones in a size range of roughly 4-6 inches, and Harvia's spec places it in sauna rooms from 706 to 1,766 cubic feet. The stove is designated for professional user groups and is built for commercial and destination-scale wood-fired saunas: large public bathhouses, ski-town communal saunas, resort wellness facilities, and multi-session commercial operations. Floor-mounted, steel construction, black finish. Minimum ceiling clearance is 6.56 ft, and Harvia specifies meaningful safety-distance setbacks from combustible materials (see the spec sheet linked below). Manufactured in Harvia's Muurame, Finland factory.
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: April 16, 2026 · White Mountain Sauna Haus (North Conway, NH) commercial bathhouse install
Model
WK500
Power output
40 kW
Stone capacity
264.6 lbs
Room size
706 – 1,766 cu ft
Min ceiling height
6.56 ft
Stone size
~4-6 inches
Net weight
428.2 lbs
Dimensions (HxWxD)
3.44 ft × 20.08 in × 28.35 in
Construction
Steel, black finish
User group
Professional
Made in
Muurame, Finland
| Model | Power | Room size | Stones | Voltage | Notes |
|---|---|---|---|---|---|
| Harvia 50 (WK500) | 40 kW | 706 – 1,766 cu ft | 264.6 lbs | — | Floor-mounted, black steel, designated for professional use |
From earnings calls, investor presentations, annual reports, and the Harvia product catalog.
1 of 1 quote include a direct source link.
“The heater is a Harvia 50, the Finnish manufacturer's largest wood-burning stove.”
Practical guidance from specialty dealers, commercial installers, and long-term Harvia operators. Use these notes alongside the official manual.
Harvia's own product classification designates the Harvia 50 as a professional-user product. It is sized and rated for very large sauna rooms (706-1,766 cu ft per Harvia's spec sheet) and for commercial use patterns. For residential wood-fired installations, Harvia's smaller wood-burning heaters (the 20, 36, Legend 150, or Cilindro wood-burning) are the more appropriate choice.
The Harvia 50 spec sheet lists specific safety distances from combustible and non-combustible surfaces at the front, sides, back, and ceiling. These distances are larger than for smaller Harvia wood-burning heaters and should be followed exactly. For a 40 kW stove running in a commercial duty cycle, getting safety-distance clearances right is the most important thing the install will get right.
Harvia specifies roughly 4-6 inch stones for the Harvia 50 — larger than what's used in smaller Harvia heaters like KIP or Vega. At commercial output, smaller stones can fracture under thermal load and pack down, cutting airflow and steam output. Use the Harvia-specified stone size range and plan for periodic stone replacement under heavy commercial use.
Large commercial wood-fired saunas, destination and public bathhouses, ski-town communal rooms, and commercial wellness installations in rooms Harvia's own spec places at 706-1,766 cu ft. Not specified by Harvia for residential use; residential wood-fired buyers should look at the Harvia 20, Harvia 36, Legend 150, or Cilindro wood-burning instead.
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.
Diagram
DiagramMedia Bank of Harvia. Courtesy of Harvia Plc.
Warranty
Per Harvia commercial terms
Made in
Muurame, Finland
Launched
WK500 is the current generation of Harvia's largest wood-burning stove
Last Harvia mention
April 16, 2026
White Mountain Sauna Haus (North Conway, NH) commercial bathhouse install
Cilindro WKPC16 / WKPC20 · flagship
The 75th anniversary wood-fired pillar. Launched January 2025.
Legend 150 / 240 / 240SL · flagship
Wood-burning flagship — the commercial wood-fired standard
Pro 20 / Pro 36 (WK-series) · commercial
Commercial wood-burning stoves for large public saunas
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.