Wood stove output (3)
(Other definitions for ash that I've seen before include "Silvery-grey" , "... for this maybe" , "It no longer burns" , "Powdery residue from fire or cigarette" , "Oleaceous tree" .)
(Other definitions for heat that I've seen before include "High temperature" , "Warm up" , "Apply warmth" , "Vehemence" , "Get agitated" .)