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Wintertime use can be extremely fun and enjoyable.

Many of us live in colder climates, so special precautions should be used to maintain proper energy efficiency and operation.

Do not let your Spa freeze up so this means keeping the heating system on. If your spa is equipped with a timer then set it to come on 4 times an hour. Some Spas thermostat controls have a freeze section.

This will enable hot water to circulate through out the system, including and most importantly the pipes. These tend to freeze up first, because they are usually on the backside of the tub and exposed the cold first. In colder climates zero degrees and below, you may need to have the heating system turned on all the time. As you operate your Hot Tub in the colder months, remember it will take longer and more energy to keep it hot.

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From: (home spas for kids) http://ezinearticles.com/?Using-Your-Spa-in-the-Winter-Time-Can-Be-Great-Fun&id=1876052