P.S.
How much heat is required to melt 1.6 grammes of ice at -40°C?
Isn't the challenge to melt XX grammes per second ?
The meltal temp may be above ice-melting but the 3rd or fourth layer of ice crystals hasn't begun to feel it yet.
My grand daddy use to tell me about sleeping in an unheated drafty room on a cold snowy night with layers of blankets to keep him warm, yet the snow flakes would still glisten on the outside layer