▁o vens ▁are ▁typically ▁fue led ▁by ▁either ▁natural ▁gas ▁or ▁electric ity , ▁with ▁bott le ▁gas ▁models ▁available ▁but ▁not ▁common . ▁When ▁an ▁o ven ▁is ▁contained ▁in ▁a ▁complete ▁st ove , ▁the ▁fuel ▁used ▁for ▁the ▁o ven ▁may ▁be ▁the ▁same ▁as ▁or ▁different ▁from ▁the ▁fuel ▁used ▁for ▁the ▁burn ers ▁on ▁top ▁of ▁the ▁st ove . ▁ ▁O vens ▁usually ▁can ▁use ▁a ▁variety ▁of ▁methods ▁to ▁cook . ▁The ▁most ▁common ▁may ▁be ▁to ▁heat ▁the ▁o ven ▁from ▁below . ▁This ▁is ▁commonly ▁used ▁for ▁b aking ▁and ▁ro ast ing . ▁The ▁o ven ▁may ▁also ▁be ▁able ▁to ▁heat ▁from ▁the ▁top ▁to ▁provide ▁bro iling ▁( US ) ▁or ▁gr illing ▁( UK / Common wealth ). ▁A ▁fan - ass isted ▁o ven ▁that ▁uses ▁a ▁small ▁fan ▁to ▁circul ate ▁the ▁air ▁in ▁the ▁cook ing ▁chamber , ▁can ▁be ▁used . ▁Both ▁are ▁also ▁known ▁as ▁con ve ction ▁o vens . ▁An ▁o ven ▁may ▁also ▁provide ▁an ▁integrated ▁rot is serie . ▁ ▁O vens ▁also ▁vary ▁in ▁the ▁way ▁that ▁they ▁are ▁controlled . ▁The ▁simplest ▁o vens ▁( for ▁example , ▁the ▁A GA ▁cook er ) ▁may ▁not ▁have ▁any ▁controls ▁at ▁all ; ▁the ▁o vens ▁simply ▁run ▁continu ously ▁at ▁various ▁temper atures . ▁More ▁conventional ▁o vens ▁have ▁a ▁simple ▁therm ost at ▁which ▁turns ▁the ▁o ven ▁on ▁and ▁off ▁and ▁selects ▁the ▁temperature ▁at ▁which ▁it