The oldest light bulb in the world has been burning for 120 years in a fire station in California. It's a gift to the station from a local power plant so that kerosene lamps didn't have to be lit when the night alarm rang. Visit their webcam at:
The need for technical systems to function without interruption also e.g. in hazard areas, unreachable locations or under extreme temperatures in the Antarctic is an important factor regarding Elstein products.
If today one were to commission an Elstein FSR heater with 100 W of power it would have a good chance, much like the fire station light bulb, of an entry into the Guinness Book of World Records.
In this way Elstein products can noticeably reduce costs that would otherwise be spent on machine downtimes.