This is the wood-burning hot tub that takes on the form of a tugboat. Worthy of a leisurely cruise on the Amstel, the craft is built in Rotterdam with a wood and fiberglass-reinforced polyester hull and powered by a 3.2-hp electric motor that provides a cruising speed of 3 mph on calm rivers, lakes, or ponds. The tug accommodates up to six adult bathers in 475 gallons of water heated by an integrated wood stove that heats the water to 100° F in 2 1/2 hours. Two ice chests built into the craft provide ample storage for drinks while four bollards secure the tug to a waterside watering hole for taking on supplies. Its rechargeable battery provides up to eight hours of power from an overnight charge using the included charger. 150″ L x 91″ W x 43″ H.