Abstract: There are disclosed housings for use in weaning piglets including walls, a roof and, at the bottom of the housing, an electrical heater lying flat underneath a surface providing at least a part of a floor for the housing. In one of the examples, the heater is a heater which is electrically insulated to form a panel-shaped structure lying flat on a base of the housing, an upper surface of the structure providing at least part of a floor for the housing. In another example, the housing comprises a box, moulded to form in one piece the said walls and floor, and a lid for the box, to form the said roof, the heater being encapsulated in the floor.