The best replacement for hot tub is spa.

The best alternatives to hot tub are rated as following:
★★★★★  spa
★★★★★  jacuzzi
★★★★★  sauna
★★★★  pool
★★  whirlpool
★  ice bath
★  cold tub
★  spa difference
★  whirlpool bath
★  steam room
★  sauna first
★  bathtub
  hot tub
  jacuzzi tub
  sauna arthritis
  swim spa
  softub
  swimming pool
  inground pool
  220
  above ground pool
  220 hot tub
  steam shower
  portable
  whirlpool tub
  stan
  separate hot tub
  gulf coast hot tub

Your alternative for hot tub is not listed? Suggest!
Speaking about hot tub, one probably shouldn't forget about gazebo.

Other search terms related to hot tub and their ratings are:
★★★★★ gazebo
deck
pool
You have in mind a companion for hot tub and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of hot tub in all years. Click on graph for more.
hot tub
spa
jacuzzi