In addition, by plastering the walls with a paste composed of sand, clay, and molasses ​ — which improves insulation and thus reduces heat loss — ​ the efficiency of the ovens has been increased by 15 percent.
Lisaks sellele on ahjude kasutegur kasvanud 15 protsenti, kuna põletusahje krohvitakse liiva, savi ja melassi seguga, mis parandab isolatsiooni ja vähendab soojuskadu.