I ka ʻoiaʻiʻo, ʻO ke kūpaʻa wela o nā kukui pahū i kona palena. ʻo kahi laʻana, inā hiki i ka pahu kukui ke kū i nā mahana a hiki i 135°C, ʻo ia ke ʻano hiki ke ʻae i ka wela nui? ʻAʻole ia he ʻoiaʻiʻo no ka mea ʻoi aku ka haʻahaʻa o ka mea kūʻai aku i loko o nā pahu kukui. Ina ka mahana wela ma mua o 100°C, hāʻule paha nā lei. No laila, ʻAʻole hōʻike ka mahana o ka pahu i ka mahana o loko o ke kukui, ʻo ia ka mea maʻamau ma kahi o 80°C.
I loko o nā wahi wela kiʻekiʻe e like me nā keʻena paila a me nā lumi kuke pena, ʻAʻole pilikia nā lumi boiler, akā, ʻaʻole kūpono nā lumi kuke pena.