▁and ▁is ▁twice ▁as ▁efficient ▁as ▁a ▁cl ay ▁st ove , ▁with ▁the ▁goal ▁of ▁reducing ▁the ▁need ▁for ▁women ▁to ▁leave ▁the ▁cam ps ▁in ▁search ▁of ▁wood . ▁ ▁The ▁Save 8 0 ▁is ▁a ▁port able ▁st ove ▁with ▁an ▁integral ▁ 8 - liter ▁pot ▁( both ▁made ▁of ▁st ain less ▁steel ) ▁and ▁we igh s ▁about ▁ 4   kg . ▁It ▁has ▁a ▁nom inal ▁effective ▁thermal ▁power ▁of ▁ 1 . 5   k W ▁and ▁needs ▁ 2 5 0 ▁g ▁of ▁small ▁dry ▁wood ▁st icks ▁to ▁bring ▁ 6 ▁lit ers ▁of ▁water ▁to ▁the ▁bo il , ▁ ▁which ▁is ▁ 8 0 % ▁less ▁than ▁a ▁traditional ▁cook ing ▁fire . ▁This ▁efficiency ▁is ▁achieved ▁using ▁the ▁ 8 - liter ▁pot ▁that ▁is ▁design - optim ized ▁for ▁this ▁st ove . ▁On ▁one ▁side ▁near ▁the ▁upper ▁rim ▁there ▁is ▁a ▁small ▁port ▁for ▁feed ing ▁additional ▁fuel ▁into ▁the ▁already ▁burning ▁st ove . ▁The ▁st ove ▁design ▁ens ures ▁pre - he ating ▁of ▁the ▁air ▁supply ▁from ▁the ▁bottom ▁in let ▁and ▁complete ▁comb ust ion ▁with ▁no ▁visible ▁smoke ▁and ▁relatively ▁small ▁amounts ▁of ▁ash . ▁Ex ha ust ▁air ▁out lets ▁are ▁on ▁the ▁side ▁opposite ▁the ▁fuel ▁feed ▁port . ▁ ▁The ▁Save 8 0 - W onder box ▁is ▁made ▁of ▁expanded ▁poly pro py l ene , ▁which ▁is ▁specifically ▁designed ▁to ▁contain ▁the ▁ 8 - liter