Anti-icing/de-icing sys on modern jets are generally eng bleed air hot air systems.
In systems of this type the leading edge sections of wings including leading edge slats but not leading edge flaps,and tail units are usually provided with a second, inner skin positioned to form a small gap between it and the inside layer of the leading edge section.The hot air is ducted into the gap and provides sufficient heat(controlled by a shutter or butterfly VLV SYS) in the outer skin.The air is then exhausted through outlets in the skin surface or also ,in some cases, trough wing tips and tail units.The use of wing Anti Ice is not recomended on the ground ,cause it may damage the wing structure.
Electrical resistance heating sys or peneumatical operated de- icing boots are usually choosen for turboprops.