Isici sokushisa esisebenza ngamashubhu ngokuvamile sisetshenziselwa ukushisisa umoya, amagesi, noma uketshezi ngokuqhuba, ukuhlanganisa, nokushisa okukhazimulayo.Inzuzo yama-heaters angama-tubular ukuthi angaklanywa ngezigaba ezahlukahlukene kanye nokwakheka kwendlela ukuze kuthuthukiswe ukushisisa kohlelo oluthile.