Lantarki Duct Duct Heaters yana amfani da wutar lantarki azaman makamashi don canza wutar lantarki zuwa makamashin zafi ta hanyar dumama wutar lantarki. Na'urar dumama na'urar dumama na'urar bututun dumama bakin karfe ne, wanda ake yin ta ta hanyar shigar da wayoyi masu dumama wutar lantarki a cikin bututun karfe maras sumul, tare da cika gibin da foda na magnesium oxide tare da kyakyawan yanayin zafi, da kuma rage bututun.