Kitchen stove, Coleman campstove, heatgun, candle, alchohol/bunsen burner, ker-o-sun heater, woodstove, wife's hairdryer, propane torch, gas grill, charcoal grill, zippo lighter, Chevy exaust manifold, hotplate, coffee maker, George Foreman low-fat grill, electric waffle iron, pancake griddle, plain ol' fire/coals, your wife's forehead when she catches you using her hairdryer, the possibilities are endless...................