This tracer heater for thin steel and copper pipes, as well as for hoses, consists of a silicone profile with parallel heating elements. The slotted shape enables pre-installed pipe systems, e.g. in analytical cabinets, to be heated without having to dismantle them. This saves considerable assembly costs. The version presently available covers piping from 4-12 mm OD. The lengths and power ratings are flexibly adapted to customer requirements. The tracer heaters are therefore very easy to replace.