INDOOR CONCRETE FIRE WITH GREAT LEATHER HANDLE Use up your wax scraps in style with the purist indoor concrete fire, which is lovingly handmade in our Krefeld factory. sustainability The indoor concrete fire is equipped with a special permanent wick which, when used correctly, barely burns and does not have to be replaced for a long time. It is necessary to add wax approximately every 3 — 4 hours (depending on temperature, type of wax and wick length). The wick consists of many, extremely thin, individual glass strands. These do not burn, as you would expect from conventional candle wicks. The fire can therefore be refilled with wax over and over again. Practical tip: Fill up your indoor concrete fire with wax before you light it again. Then you can also spread the wax well, as it doesn't stick to the liquid wax right away. However, you can also add more at any time.