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

Harvia's own olivine diabase sauna stones — the stones the factory recommends for their electric and wood-burning stoves.

Olivine diabase has a beautifully high thermal mass: it soaks up heat while the stove is running and releases it slowly, giving you long, steady löyly instead of a quick blast that fades. The AC3000 is the smaller 5–10 cm grade, ideal for packing tightly around electric heater elements where you need consistent airflow with minimal dead-spots.

At a glance

• Stone type: Olivine diabase
• Size: 5–10 cm
• Bag weight: 20 kg
• Made in: Finland

Rinse before first use to wash off any quarry dust. One 20 kg bag will dress a small-to-medium heater; larger stoves may need two or three.

Price includes 23% Irish VAT.