Hot tubs, or spas, are an enjoyable way to relax at the end of a long day. Depending on the hot tub's size and configuration, the spa can seat two people or a dozen. Hot tubs typically feature massagers, or jets, which deliver strong pulses of water to different parts of your body. You can adjust the spa's thermostat to have warmer or cooler water, depending on your preference and the air temperature around you.
Hydrotherapy Benefits
Hot tubs provide a form of hydrotherapy, or water therapy. The Hot Tub Guide notes that the warm water helps to ease sore muscles, expands blood vessels to improve circulation and enhances joint flexibility. You can direct spa jets to parts of your body that need extra attention. Finally, your hot tub sessions will likely help to relieve stress and improve your quality of sleep.
Functional Components
A hot tub consists of seven major components. The Hot Tub Living Guide explains that the spa's surface, or shell, is made of a durable thermoplastic reinforced with insulating foam. The shell is surrounded by the cabinet, or decorative exterior that often resembles wood. The cabinet contains the machinery and electrical assemblies.
The heater warms the spa water, and pumps circulate the water around the spa. Jets provide a high-pressure mix of water and air that soothes your body with bubbles. The filtration system, consisting of the filters and chemicals, keeps the spa's water clean. Finally, a digital control panel enables you to select water temperature settings.
Cost
Your hot tub's cost depends on its size and features. The CostHelper website estimates that in 2010 a typical five- to seven-person hot tub costs between $3,000 and $7,000. This includes jets and molded seating, but does not include extras such as a built-in sound system or underwater lighting. Luxury hot tubs can cost as much as $15,000.
For an outside installation, you'll need a level concrete pad or deck. For an interior installation, you'll require a room with humidity regulation and a tiled floor. This additional preparation adds to the overall cost.
Considerations
Make sure the spa is clean and looks well maintained. The Centers for Disease Control and Prevention advises that you should hear a mechanical hum that indicates the filtration systems and pumps are working. Inside surfaces should be smooth, without any slime or coating that indicates maintenance problems. Finally, a chemically balanced hot tub does not smell. If you notice any type of strong odor, the spa is not properly maintained.
Warning
Although hot tubs can be relaxing, the Arthritis Foundation recommends you get your doctor's approval if you have specific medical conditions. Concerns include heart or lung disease, circulatory issues, diabetes or multiple sclerosis. Blood pressure irregularities also cause concerns. If you're pregnant, don't use a hot tub without your doctor's approval. Finally, stay out of the hot tub if you've indulged in alcohol or drugs, as these substances can make you sleepy.


