Hot tubs/jacuzzis are common on upper-class seafaring vessels, but what if your vessel was literally a hot tub? In that case, you'd be sailing along in a HotTug (€11,450; roughly $14,800 and up). This ingenious little boat is made from wood and fitted with glass fiber reinforced polyester, uses a stainless steel stove with a single wall pipe to keep the water as warm as you like, and is powered by either an electric or standard outboard motor. Used to having company in the water? Not to worry, as this boat can hold six to eight people.