In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
In a separate bowl, mix the sparkling water, buttermilk, melted butter, vanilla, orange zest, and egg.
Pour the wet ingredients into the dry and stir gently until just combined - a few lumps are okay.
Let the batter rest for 5-10 minutes to activate the leavening.
Heat a non-stick pan or griddle over medium-low and lightly grease it with butter or oil. Pour about 1/4 cup (60 ml) of batter per pancake into the pan.
Cook until bubbles form and the edges begin to set. Flip and cook the other side until golden brown.
Stack and serve warm with butter, syrup, or fresh fruit.