Indirect uses (end-use category)
The
end-use category that handles boiler fuel. Fuel in boilers is transformed
into another useful energy source, steam or hot water, which is in
turn used in other end uses, such as process or space heating or electricity
generation. Manufacturers find measuring quantities of steam as it
passes through to various end uses especially difficult because variations
in both temperature and pressure affect energy content. Thus, the
MECS (an EIA survey) does not present end-use estimates of steam or
hot water and shows only the amount of the fuel used in the boiler
to produce those secondary energy sources.