[] Gas: from underground pipes serving the neighborhood
[] Gas: bottled, tank, or LP
[] Electricity
[] Fuel oil, kerosene, etc.
[] Coal or coke
[] Wood
[] Solar energy
[] Other fuel
[] No fuel used

"Fill the circle for the fuel used most to heat your house, apartment, or mobile home. In buildings containing more than one apartment you may obtain this information from the owner, manager, or janitor. Solar energy is provided by a system that collects, stores, and distributes heat from the sun. Other fuel includes any fuel not separately listed; for example, purchased steam, fuel briquettes, waste material, etc."