We highly recommend using rounded stones in HUUM stoves to complement the design and have milder steam.  In our selection, we have rounded olivine diabase stones: 2-3.9 in / 5-10 cm.  The stones are durable and have high heat capacity.  You can also use other types of stones in HUUM heaters, except decorative stones because they can break easily.

• diameter 2-3.9 in / 5-10 cm – 33 Ib / 15 kg package