MyHarvia Smart Sauna Sensor

A retrofit smart sensor that turns any sauna — even wood-burning — into a connected sauna

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 functionality that was previously impossible.