Abstract: The invention relates to a gas hearth, at least comprising a combustion chamber, gas supply means for supplying combustible gas into the combustion chamber to firebed-simulating means positioned in the combustion chamber, ignition means for igniting the combustible gas in the combustion chamber and a flue-gas discharge duct connected to the combustion chamber for discharging combustion flue gases from the combustion chamber, as well as metering means which are arranged in the combustion chamber for metering a pyrotechnical additive into the flames of the burning combustible gas during operation, wherein the metering means comprise a reservoir for the pyrotechnical additive which reservoir is provided with at least one metering opening.

Abstract: A vehicle for cleaning surfaces is provided with a first tank for storing cleaning liquid; a device for spraying liquid at a first pressure and a first flow rate onto the surface to be cleaned; a device for sucking the sprayed liquid towards a second tank; and a device for moistening the surface to be cleaned with liquid at a second pressure and a second flow rate. The second pressure is lower than the first pressure and the second flow rate is lower than the first flow rate. The spraying and sucking devices are located at the rear of the vehicle and the moistening device is located at the front of the vehicle.