Abstract: This invention describes a stove comprising a combustion chamber and a flue for removing exhaust from said combustion chamber, where said combustion chamber and said flue are connected via a passageway; said combustion chamber comprising a top and a bottom, where said top and said bottom are connected by one or more sides; a catalytic unit arranged between said combustion chamber and said flue in said passageway; said catalytic unit provides a guide way for the exhaust, where said catalytic unit comprises at least one isolating members and at least one catalytic member, said catalytic member comprising a first wave-like structure, said first wave-like structure being provided on at least one catalytic surface of said catalytic member and, in use, at least partly being in contact with the exhaust and, where, in use, the direction of the exhaust is substantially transverse to the waves of said first wave-like structure.