▁pot ▁of ▁the ▁Save 8 0 ▁st ove . ▁It ▁is ▁designed ▁to ▁keep ▁a ▁near ▁bo iling ▁temperature ▁for ▁a ▁relatively ▁long ▁time . ▁After ▁reaching ▁the ▁bo iling ▁temperature , ▁food ▁– ▁for ▁instance ▁rice ▁– ▁can ▁be ▁transferred ▁to ▁the ▁Wonder box , ▁a ▁retained ▁heat ▁cook ing ▁device . ▁There ▁it ▁continues ▁to ▁heat ▁up . ▁ ▁The ▁solar ▁cook er ▁uses ▁no ▁fu els . ▁These ▁devices ▁require ▁clear ▁sun light , ▁and ▁are ▁practical ▁in ▁many ▁of ▁the ▁sun ny ▁regions ▁of ▁the ▁world . ▁ ▁The ▁Energy ▁and ▁Resources ▁Institute ▁cook st ove ▁model ▁S PT - 6 1 0 ▁has ▁an ▁efficiency ▁of ▁ 3 7 %, ▁and ▁has ▁been ▁developed ▁in ▁collaboration ▁with ▁Indian ▁Institute ▁of ▁Technology ▁Del hi . ▁ ▁Advanced ▁bi om ass ▁cook st ov es ▁ ▁There ▁are ▁two ▁primary ▁types ▁of ▁advanced ▁bi om ass ▁st ov es ▁that ▁can ▁achieve ▁high ▁levels ▁of ▁performance ; ▁forced ▁air ▁st ov es ▁and ▁gas ifier ▁st ov es , ▁both ▁of ▁which ▁can ▁run ▁on ▁processed ▁or ▁raw ▁bi om ass . ▁ ▁For ced ▁air ▁st ov es ▁have ▁a ▁fan ▁power ed ▁either ▁by ▁a ▁battery , ▁an ▁external ▁source ▁of ▁electric ity , ▁or ▁a ▁therm oe lect ric ▁generator . ▁This ▁fan ▁blow s ▁high ▁velocity , ▁low ▁volume ▁j ets ▁of ▁air ▁into ▁the ▁comb ust ion ▁chamber , ▁which ▁when ▁optimized ▁results ▁in ▁more ▁complete ▁comb ust ion ▁of ▁the ▁fuel . ▁Gas ifier