Drip Coffee Makers require an external source of hot water. The filter can either be paper or a porous metal screen. Drip makers generally make the highest quality brew because the coffee never boils. Percolators are an attempt to integrate the functions of water heating and brewing. The grounds are placed in a small chamber at the top and plain water goes into the bottom.
Brewed coffee drains downward into the bottom chamber.
The source of heat can be a stove or a built-in resistance coil. Vacuum Coffee Makers also integrate the heating and brewing functions. Coffee grounds are placed in the clear glass vessel on the top. Water is heated in the bottom component. Boiling water travels upward in the tube and contacts the grounds, brewing the coffee in the upper chamber.