| 摘要 |
A heat source machine includes: a first emission amount calculation unit 12 which calculates a first carbon dioxide emission amount that is an amount of carbon dioxide emitted to obtain an energy source consumed in a hot-water supply operation; a second emission amount calculation unit 13 which calculates a second carbon dioxide emission amount that is an amount of carbon dioxide emitted to obtain an energy source consumed in a reference heat source machine on an assumption that the reference heat source machine performs the same operation as the hot-water supply operation; and a carbon dioxide emission reduction degree display unit 14 which displays a carbon dioxide emission reduction degree that results from changing to the current heat source machine, according to a difference between the first carbon dioxide emission amount and the second carbon dioxide emission amount.
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