One who has established the Vedic fires by performing the Agnyādhāna ceremony is called an āhitāgni. According to Jaimini’s Pūrva Mīmāṁsā Sūtras, an āhitāgni has to maintain the fires and utensils throughout his life. On his death, he is cremated in his fire along with the sacrificial utensils which are placed on the different parts of his body. This is called pratipatti. (vide Śābarabhāṣya on 11.3.34)
See also AGNYĀDHĀNA.