Ngenxa yokuba abantu basetyenziselwa ukubiza iibhoyila ze-steam generators, iijenereyitha zomphunga zihlala zibizwa ngokuba yi-boilers yomphunga. Iibhoyili ze-steam ziquka iijenereyitha zomphunga, kodwa iijenereyitha ze-steam azikho iibhoyili ze-steam.
Ijenereyitha yomphunga sisixhobo esinomatshini esisebenzisa isibaso okanye eminye imithombo yamandla ukufudumeza amanzi ukuvelisa amanzi ashushu okanye umphunga. Ngokutsho kokuhlelwa kwesikhululo sokuhlola ibhoyili, i-generator ye-steam yeyomkhumbi woxinzelelo, kwaye ukuveliswa kunye nokusetyenziswa kufuneka kube lula.