Core77

While the Dutch Oven has nasty connotations, the DutchTub does not. The latter (designed by Floris Schoonderbeek) is a no-electricity-required outdoor hot tub, made out of wood and heated by a plain ol' fire:

After filling the tub with water, a fire can be started in the attached basket to kick start the heating process. The hot water starts to rise in the spiral, which automatically starts pouring in through the spiral, and begins circulating from the bottom to the top.

With a heating time of 2.5 hours, the DutchTub is not for the spontaneous; then again, "going Dutch" is not for the romantic, but people still do it.

via 3 rings