Preheat your oven to 425°F (220°C).
In a saucepan, combine water and butter, bringing it to a boil.
Stir in flour and salt, mixing until a dough forms.
Remove from heat and let it cool slightly.
Beat in eggs one at a time until the mixture is smooth.
Transfer the dough to a piping bag and pipe 4-inch lines onto a baking sheet.
Bake for 20-25 minutes until golden and puffed.
Let the eclairs cool completely on a wire rack.
Whip the heavy cream with powdered sugar and vanilla until stiff peaks form.
Fill eclairs with cream using a piping bag.
Melt chocolate with vegetable oil and dip the tops of the filled eclairs.
Allow the chocolate to set before serving.