Hot tub

From ArticleWorld

A hot tub is a large tub full of heated water that is used for soaking, relaxation, hydrotherapy, or meditation. In most cases, a hot tub has jets for massage purposes. Hot tubs are frequently located outdoors, although they are often sheltered against sun, rain, wind, or snow.

Soaking tubs

This style of tub is constructed like a very large barrel. The water is usually still, circulated only for the purposes of heating and filtering. Seating within the tub usually takes the form of a wooden bench, or a seat, that forms a ring around the inner circumference of the tub. The tub is filled once at system startup and is then maintained in much the same manner as a swimming pool. In simple designs, chlorine is used, while in more sophisticated designs, an ozone generator is used, reducing the amount of chemicals needed to disinfect the water. The tub is usually heated by electricity but can be heated with natural gas, propane, or wood fires.

Spas

This type of tub is very different from the wooden soaking tub. These are usually less deep, and are manufactured from fiberglass-reinforced plastic formed into shapes that provide a variety of seating arrangements within the tub. Each seat is usually equipped with hydrotherapy jets that allow a flow of water to be directed at various areas of the body.

Bathtubs

Much smaller spas are now commonly available for installation in an ordinary bathroom. Resembling conventional bathtubs, they are filled with fresh water for each use. They don't usually contain any heating or filtration mechanisms. They generally only accommodate one or two people.