Harvia Sauna Rocks | Black Vulcanite

Harvia Black Vulcanite sauna stones: striking looks, built to last Harvia’s Black Vulcanite sauna rocks combine performance with striking looks. With volcanic origins dating back roughly 2 billion years, these stones have a fine, uniform grain that turns a deep, glossy black when splashed with water, adding a bold visual element to the heater. Beyond their appearance, Vulcanite rocks are exceptionally hard and durable, standing up well to the extreme heat and thermal cycling of sauna use. Their consistent granule size promotes even heat distribution across the heater, while their density helps them resist cracking and wear over time. Specifically selected to pair with a range of Harvia heaters, they’re a strong choice for anyone wanting both style and long-term reliability. Key Features 20kg box, stone size 10-15cm Turns a striking glossy black when wet Sourced from Western Finland’s subvolcanic rock deposits Dense composition for excellent heat storage and retention Withstands repeated heating and cooling without breaking down Produces optimal steam for a genuine sauna experience Compatible with most sauna heater models Note: heavy item shipping rates apply for this item