This hot tub time machine may not actually take you back to your past, but it does use old-school wood-fire to bring it up to luxuriating temps. The four-person hot tub is crafted in beautiful stainless steel and exclusive Kebony wood from the UK. There’s no electricity used. Instead the Kirami water heater is queued by the burning of wood that can be conveniently stored in the body of the hot tub, and smoke is vented from the tall chimney that has its own heat shield, which we still wouldn’t advise leaning up against.