This paper tackles the problem of industrial waste heat recovery through an unexploited heat transfer mechanism: thermal radiation.Energy intensive industries have a considerable potential Applicator of unused radiant heat, which cannot be recovered through existing methods.That potential Hard Tops energy is quantified for the main identified industries: steel and glassmaking.Then, a radiant heat capturing device allowing high temperature heat capture is designed according to process requirements.Finally, recoverable heat is estimated and potential uses are proposed.