A retrofit smart sensor that Harvia says turns any sauna, even a wood-burning one, into a connected sauna
P.10Premium
MyHarvia Smart Sensor
Specs from harvia.com and Harvia Plc materials, in US units. Check the current Harvia manual before you wire or install.
A wireless sensor reading temperature and humidity in any sauna and pushing to the MyHarvia app. Works on electric, wood-burning, and saunas with no electricity at all.
The MyHarvia Smart Sauna Sensor is the 2025 category expansion Harvia called "a completely new category never seen in the sauna market before" on the Q4 2025 earnings call. Unlike Xenio or Fenix, this is not a control panel. It's a wireless monitoring sensor. It reads temperature and humidity in any sauna room and transmits to the MyHarvia app. Because it doesn't control a heater, it works inside sauna rooms with no electrical service at all, including traditional wood-fired saunas. For commercial operators, it adds data without rewiring. For residential wood-fired sauna owners, it adds smart-sauna functions that a Harvia control panel could not provide.
Wood-fired sauna owners who want smart-sauna data. Commercial operators of wood-fired rooms who need operational monitoring. Existing Harvia Fenix/Xenio owners adding a second sauna. Anyone retrofitting smart functionality onto a non-Harvia sauna.
Editorial analysis for context, not a purchase recommendation.
Room sizes in cubic feet, stone loads in pounds.
From earnings calls, investor presentations, annual reports, and the Harvia catalog.
“MyHarvia Smart Sauna Sensor, which is a completely new category never seen in the sauna market before.”
CEO Matias Järnefelt, Q4 2025 earnings call
Launch framing for the sensor
“It works in any sauna, so it really turns any sauna into a smart sauna, whether it's a wood-burning sauna without electricity.”
CEO Matias Järnefelt, Q4 2025 earnings call
Category-expansion logic: the sensor also works in wood-fired and unpowered saunas
“In the fourth quarter, we introduced MyHarvia Smart Sauna Sensor, a unique product that can turn any sauna into a smart sauna, which is a great example of our market-leading innovation and an exciting step in our digital journey.”
Harvia Q4 2025 press release
Official launch positioning in the press release
“We want to be an active market maker to grow the sauna market and create exciting innovations in sauna solutions, products, accessories, and digital services to deliver great sauna experiences.”
CEO Matias Järnefelt, Capital Markets Day 2024
Strategic framing that preceded the Sensor launch: digital services is the bet
Check each note against the current Harvia manual and your local code.
N.01
The MyHarvia Sensor is a thermometer and hygrometer, not a switch. It will not start your wood-burning sauna remotely. What it does: lets you check bench temperature from the house before walking out to light the fire, and logs temperature and humidity over time. Think "sauna dashboard," not "sauna remote."
N.02
For destination properties, ski-town bathhouses, and resort wood-fired rooms, the Sensor adds operational data: actual bench temperature, humidity curve through a session, time-to-heat from cold start.
N.03
Harvia's controller platform historically only attached to Harvia electric heaters. Harvia pitches the Sensor as its first smart product that works in any sauna, including wood-fired ones. The Q4 2025 earnings call called this out as a distinct category expansion, not a feature release.
N.04
If you already own a Fenix-controlled electric sauna, adding a MyHarvia Sensor extends the app's data to any second wood-fired or outdoor sauna on the property. Both show up in the same MyHarvia dashboard.
Product, detail, and technical images from the Harvia Media Bank.
Images: Harvia Media Bank, courtesy of Harvia Plc, unless the caption says otherwise.
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Product data comes from Harvia Plc investor materials, earnings call transcripts, harvia.com, and harviagroup.com. Quotes carry their source where a public one exists. SaunaNews is not affiliated with Harvia Plc; this page is a product record for news coverage, not a sales page. Spot an error or an outdated spec? Tell the newsroom .
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