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A coal bin, coal store or coal bunker is a storage container for 
Domestic coal bunkers are associated with the use of coal in open fires or for solid-fuel
A coal bin, coal store or coal bunker is a storage container for coal
Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
Coal is formed when ...
awaiting use or transportation. This can be either in domestic, commercial or industrial premises, or on a ship or locomotive tender
A tender or coal-car (US only) is a special rail vehicle hauled by a steam locomotive containing its fuel (wood, coal, oil or torrefied biomass) and water. Steam locomotives consume large quantities of water compared to the quantity of fuel, s ...
, or at a coal mine or processing plant.
Domestic coal bunkers are associated with the use of coal in open fires or for solid-fuel central heating
A central heating system provides warmth to a number of spaces within a building from one main source of heat. It is a component of heating, ventilation, and air conditioning (short: HVAC) systems, which can both cool and warm interior spaces.
...
. Free-standing bunkers were commonly made of wood or concrete and are currently sold in materials including plastic or galvanised metal. Coal bins or bunkers could also form an outhouse or be partly or fully underground.
Coal bins form or formed part of industrial plants, and were found on steam ships.
References
{{architecture-stub Semi-subterranean structures Bin