New England Clam Chowder

Name: New England Clam Chowder
Ingredients: 3 pounds (1,3kg) fresh clams in shells, well-scrubbed; 2 cups (500ml) water; 2 tablespoons butter, salted or unsalted; ¾ cup (110g) diced bacon; 1 medium onion, peeled and diced into 1/4-inch (1cm) pieces; 2 large potatoes, peeled and diced(into 1/4-inch (1cm) pieces; salt and ground black pepper; generous pinch of smoked or sweet paprika; 1 cup (250ml) whole milk; ½ cup (125ml) heavy cream; 1 to 2 tablespoons chopped flat leaf parsley