Ngokwendlela yokushisisa, ingahlukaniswa ibe ibhodwe elinejakhethi yokushisisa isitimu kanye nebhodwe elinejakhethi yokushisisa kagesi. Ukukhethwa kwebhodwe elifakwe isitimu esishisayo kuklanyelwe ngokuya ngezidingo zokushisa ezishisayo zezinto zokwakha noma usayizi wengcindezi yesitimu. Ugqinsi oludingekayo lwepuleti lensimbi likhulu. Ibhodwe elinejakhethi yokushisisa kagesi alinayo inkinga yokucindezela, kodwa ibhodwe elifakwe ijakhethi kagesi lidla ugesi omningi, okungawongi kakhulu amandla. Ukushisa kagesi kulungele amabhizinisi ezimboni ngaphandle kwama-boilers we-steam.