Qhov tseeb, lub tshav kub tsis kam ntawm tawg-pov thawj teeb muaj nws cov kev txwv. Piv txwv li, Yog tias lub teeb lub teeb yuav tiv taus kub txog li 135 ° C, txhais tau hais tias nws tuaj yeem tiv taus cua sov? Qhov ntawd tsis tas yuav muaj tseeb vim tias cov cam hauv qhov hlaws ci lub teeb muaj qhov qis dua qhov kub tsawg dua. Yog tias kub tshaj 100 ° C, Cov hlaws dai yuav poob tawm. Yog li ntawd, Lub casing kub tsis sawv cev rau sab hauv kub ntawm lub teeb, uas yog feem ntau nyob ib ncig ntawm 80 ° C.
Nyob rau hauv qhov kev kub-ib puag ncig xws li boils chav thiab cov xim ci, boiler chav feem ntau tsis txhob muaj teeb meem, tab sis cov xim ci yog qhov tsis zoo.