What’s the Difference Between a Hot Tub and a Spa?

Hot tubs and spas are both containers filled with warm water, usually equipped with various massage functions and designed for relaxation. However, the two types of units are different in many respects, even though the two terms are often used interchangeably – here are some of the most important differences:

• Construction – while hot tubs are portable appliances that can be installed easily anywhere where there is a suitable power supply and a water supply available, spas are usually custom-built units, located in a hole dug in the ground;
• The materials used – while most hot tubs are practically a fiberglass or acrylic shell equipped with a pump to drive the jets and to circulate the water, most spas are more complex, custom-built structures that use concrete and tile walls;
• Size – hot tubs are usually smaller, able to accommodate two or three people at a time, while spas can be much larger, many of them being suitable for being used by ten people at a time. Spas and tubs are different in terms of the quantity of water they hold: hot tubs can be usually filled with around 500 gallons of water, spas usually need 800 or more;
• Typical owners – hot tubs are more commonly used in homes, while spas are usually located in more complex facility, such as wellness hotels or exclusive beauty salons.

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