4 ms·from the box itself, i'd guess... electric heating elements?by cracki 17y agofrom the box itself, i'd guess... electric heating elements?pedalpete 17y agoelectric heating elements to get 1800F? Wouldn't that take more power than this thing would create? I missed the part about heating to 1800.ncarlson 17y agoThe chemical reaction heats up the box. However, large amounts of insulation is needed to retain the heat.