|Boiling Point No. 12 - April 1987 (ITDG Boiling Point, 1987)|
A one-pot metal stove to take a range of pot sizes.
This paper describes a sheet steel stove designed to be used with a range of sizes of pots (size 1-7) and still maintain the correct grate to pot distance and so have good efficiency in each case. It is a single pot, portable, wood fuel, chimneyless stove (see Fig. 1). As can be seen, smaller pots will sit lower down the 3 ribbed cone and so will be at approximately the optimum distance from the grate for heat transfer and fuel combustion. The grate to pot distance varies from 10 to 14 cms for pots 1-7 size and the efficiencies in boiling water tests varies from 21% to 33%. These efficiences are slightly lower than those of the Mai Sauki for smaller pots but higher for larger pots. Similarly, the power control is slightly lower.
Field experience has revealed some problems with the stove, in particular,stove itself is no more unstable than Mai Sauki, the pot is not held so firmly in the stove and needs to be levelled if it is distributed by stirring etc. Most families use two stoves for cooking a normal meal, a small one for sauce and a larger one for "pate" or rice and so fuel consumption and cooking time comparisons were made on this basis.
At 1200 F.CFA. the multimarmite is more expensive than the Mai Sauki but is stronger. The design and production will continue to be improved during forthcoming field testing and development work, and more attention will be given to cooking with larger pot sizes, 8-10. The parer gives details of the templates and calculations for laying out the cone needed to produce the multimarmite.