Abstract: A device for separating gas from liquid, in particular for separating air from water and for discharging the separated gas, is designed for placing in a liquid circulation system through which gas-containing liquid flows. The device comprises a housing with a feed aperture and a discharge aperture for the liquid to be degassed. The internal space of the housing is at least partially filled with open filling elements which have a large surface area relative to the volume taken up. The filling elements can be the shape of hollow cylindrical elements, known per se, comprising a cylindrical wall provided with apertures, and projections extending inwards from the wall. At the top side of the housing, in the wall thereof, a valve for the discharge of the separated gas is provided. The valve is operated by a float comprising a float element and a float rod.