A beverage carbonator is included. The carbonator has a carbonator outlet, a carbonator inlet, and a fluid flow path extending between the carbonator outlet and the carbonator inlet. A carbonation chamber has a carbonation chamber gas outlet fluidly coupled to the fluid flow path and a carbonation chamber fluid inlet. A liquid reservoir is positioned upstream from the carbonation chamber fluid inlet. A flow valve is movable between a reservoir-connected position and a gas-recirculation position. A pump is fluidly coupled to the fluid flow path downstream of the flow valve.