Thli-heaters tse chesitsoeng ba e entsoe ka tšepe ea boleng bo holimo, phofshoana e fetotsoeng ea magnesium oxide, terata e phahameng ea mocheso oa motlakase oa mocheso, sink ea mocheso ea tšepe e sa hloekang le lisebelisoa tse ling, 'me e etsoa ka lisebelisoa tse tsoetseng pele tsa tlhahiso le lits'ebetso, ka taolo e thata ea boleng. Thepa e futhumatsang ea motlakase e feliloeng e ka kengoa likotopong tse fokang kapa linakong tse ling tsa ho futhumatsa moea o emeng le o phallang.