Izifudumezi zokumunca zisetshenziselwa ukushisisa imikhiqizo ngaphakathi kwamathangi okugcina, ikakhulukazi uma le mikhiqizo iqinile noma iqinile kancane emazingeni okushisa aphansi.
Izifudumezi zokudonsa, eziklanyelwe ngokukhethekile ukushisisa izinto kuphela lapho zikhishwa, zonga izindleko ezinkulu zamandla njengoba zonke izidingo zokushisisa zehliswe kakhulu.Izifudumezi zokucwilisa ze-WNH zisebenza ngokusebenza kahle kuka-100% kuyilapho uwoyela wamandla nezinhlelo zoketshezi ezishisayo zamanzi-glycol zithola ukusebenza kahle okuphezulu, ikakhulukazi emazingeni okushisa aphakeme isikhathi eside.Amasistimu oketshezi olushisayo angasetshenziswa ngokuhambisana nezishintshisi zokushisa zokucwiliswa ukuze kunikeze isisombululo sokushisa ithangi esitshalweni esibanzi.Ngokuhlangenwe nakho kweminyaka engaphezu kwe-10, onjiniyela be-WNH bangakuqondisa kunqubo yokunquma uhlelo olufanele nolungabizi kakhulu lwesicelo sakho ngasinye.