Hot tubs are generally used for relaxation and hydrotherapy. They are usually installed outdoors and they tend to be protected for privacy. In some regions, hot tubs are known as Jacuzzi or even spa. They are built from wood or plastic and are heated with an electric heater but people also use a natural gas heater. At first tubs were heated only with wood but in time these methods improved and nowadays people heat them with natural gas heaters, solar systems and electric heaters. The water can be dangerous in case it is not heated properly and sometimes it must be combined with cold water to reach the desired temperature. The sanitization of the water in hot tubs is very important because there are living organisms that live in the hot environment.
It is recommended to heat them properly because otherwise you can damage their structure. The wooden hot tubs are built just like a barrel but sometimes bigger. They have a ring inside them on which people can sit down when they enter in the tub and a wooden deck is also built for people to get in easier. It is recommended that children are not left unsupervised inside this kind of tub and around them. If the tubs are not properly maintained, there can appear health problems that include respiratory infections and problems with the lungs. That is why the tub must have a proper design and a good sanitation system. The water chemistry must always be kept in the proper ranges.