an insect (Thermobia domestica) which is a type of bristletail that lives in warm moist areas e.g. around furnaces.

The Firebrat (Thermobia domestica, sometimes listed as Thermophila furnorum) is a small insect (typically 1–1.5 cm) similar to the Silverfish, both in the order Thysanura. Firebrats prefer higher temperatures and require some humidity, and can be found in bakeries and near boilers or furnaces. They feed on a wide variety of carbohydrates and starches that are also protein sources such as flour and book bindings, and can go for as much as a year without eating.