These fireplaces do not require either a chimney or a fuel system. The fires have a tank which does require filling before igniting the fire.
A bio ethanol fireplace burns cleanly, without producing either smoke, soot, or ash. Its only emissions into the room are – heat, water vapour, and a very small amount of carbon dioxide.
As a result, it is a choice for properties like flats, which can’t be fitted with a flue system or a chimney.