Hot tub heater

A hot tub heater, or spa heater is an electric or gas-fired water heater that provides the all important hot water used for soaking, and relaxing in a hot tub, Jacuzzi, or as it is often known, a portable spa. The spa heater warms water anywhere from just above freezing to the desired temperature, usually about 100 to 104 degrees F (about 38 to 40 degrees C. Portable spas and hot tubs are generally kept hot and ready for use at all times, whereas in-ground, or above-ground spas are often left cold, and heated just prior to use.

Hot tub

Hot tub is a large home-made or manufactured tub or small pool full of heated water and used for soaking, relaxation, massage, or hydrotherapy. In most cases, they have jets for massage purposes. Hot tubs are usually located outdoors, and are often sheltered for protection from the elements, as well as for privacy.

There are three different styles of hot tubs:
* Simple wooden-staved soaking tubs
* One piece plastic tubs (usually referred to as "spas")
* Pleasurable sensations (usuall referred to as "erotic" derived from the greek god Eros)