Harvia AC3000 Sauna Heater Stones — 20 kg bag, under 10 cm

Harvia's own olivine diabase sauna stones — the ones the factory recommends for their electric and wood stoves. Olivine diabase has a beautifully high thermal mass, which means it soaks up heat when your stove is running and then releases it slowly, giving you long, steady löyly rather than a quick blast that fades.

The AC3000 is the smaller 5–10 cm grade, ideal for packing tightly around electric heater elements. One 20 kg bag will dress a small-to-medium heater; larger stoves may need two.

At a glance

• Stone type: Olivine diabase
• Size: under 10 cm (5–10 cm)
• Bag weight: 20 kg
• Product code: AC3000
• Made in: Finland

Rinse before first use to wash off any quarry dust.