| 摘要 |
PROBLEM TO BE SOLVED: To enable to play at outdoor waterfront easily at a low cost regardless of season. SOLUTION: One or a plurality of bottom surfaces B each having a part of a bottom surface A of a boat dropped downward are provided. A hot water and hot air generating mechanism is provided in a firewall to utilize thermal energy thereof. A boat is provided with a device to maintain the temperature of a space in the boat suitable by making the sidewall and a floor part of the boat hollow or arranging pipes appropriately for effectively utilizing heat.
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