Jacuzzi
From The Blockheads Wiki
A jacuzzi is a player-made structure. It will regenerate a blockhead's lost health and increase their environment bar. The jacuzzi will not send the blockhead's health and/or environment into overdrive, along the lines of the myth with coffee cherries and coffee.
Building
A jacuzzi is made by heating up water. Don't heat it up too much, or it will become a boiler!
Appearance
The jacuzzi's water starts to steam as it is hot. It will generate light gray particles.