An electrostatic atomizer is disclosed, which includes an electrode or other charge injection device and a source of liquid for passing a stream of liquid past the charge injection device to a variable orifice. The variable orifice is defined between at least two elements, which are movable with respect to each other. A compact stove incorporating the atomizer includes a support for supporting articles to be heated by the burning of atomized fuel. The variable orifice may be used in the stove to control the flow, and therefore thermal output, of the stove.