A steam engine including at least: - one heating enclosure containing first heating means carrying a fluid in the vapour state, - a vacuum chamber of vaporised fluid connected upstream of the heating enclosure via a first pipe, - a second intake pipe disposed downstream of the heating enclosure and connecting the latter to a highpressure steam drive enclosure inside which at least one double acting piston is displaced, in an alternating and sealed manner, having a rod and a head on either side of which are defined: * A first compression chamber connected to a first inlet of vaporised fluid communicating with the second intake pipe and with a first outlet of vaporised fluid, and * a second compression chamber connected to a second vaporised fluid inlet also communicating with the second intake pipe and with a second vaporised fluid outlet, - the rod of the piston being connected to a connecting rod/crank assembly rotating a drive shaft thanks to the alternating linear movement of said rod, - the second intake pipe transporting the vaporised fluid from the heating enclosure to the drive enclosure, - a third exhaust pipe connecting the first and second vaporised fluid outlets (55, 57) and the vacuum chamber, the third pipe transporting the vaporised fluid from the first and second outlets (55, 57) to the vacuum chamber, - the vacuum chamber, the heating enclosure heating, the drive enclosure and the first, second and third vaporised fluid transport pipes forming a closed sealed circuit, and - the first heating means is electrical and is connected to a power supply battery. - one heating enclosure containing first heating means carrying a fluid in the vapour state, - a vacuum chamber of vaporised fluid connected upstream of the heating enclosure via a first pipe, - a second intake pipe disposed downstream of the heating enclosure and connecting the latter to a highpressure steam drive enclosure inside which at least one double acting piston is displaced, in an alternating and sealed manner, having a rod and a head on either side of which are defined: * A first compression chamber connected to a first inlet of vaporised fluid communicating with the second intake pipe and with a first outlet of vaporised fluid, and * a second compression chamber connected to a second vaporised fluid inlet also communicating with the second intake pipe and with a second vaporised fluid outlet, * A first compression chamber connected to a first inlet of vaporised fluid communicating with the second intake pipe and with a first outlet of vaporised fluid, and * a second compression chamber connected to a second vaporised fluid inlet also communicating with the second intake pipe and with a second vaporised fluid outlet, - the rod of the piston being connected to a connecting rod/crank assembly rotating a drive shaft thanks to the alternating linear movement of said rod, - the second intake pipe transporting the vaporised fluid from the heating enclosure to the drive enclosure, - a third exhaust pipe connecting the first and second vaporised fluid outlets (55, 57) and the vacuum chamber, the third pipe transporting the vaporised fluid from the first and second outlets (55, 57) to the vacuum chamber, - the vacuum chamber, the heating enclosure heating, the drive enclosure and the first, second and third vaporised fluid transport pipes forming a closed sealed circuit, and - the first heating means is electrical and is connected to a power supply battery.