An Etymological Dictionary of the German Language/heizen

by Friedrich Kluge

heizen, vb., ‘to heat,’ from the equiv. MidHG. and OHG. heizen, a variant of heiȥen (comp. beizen, reizen); a nominal verb from heiȥ, stem haita-, Goth. *haitjan; comp. AS. hœ̂tan, ‘to make hot, heat’ (from hât), E. to heat. See heiß.