A heater allows you to start your swimming season earlier and extend it later into the year, and can lengthen your swimming day. Finally, a heater is considered a good investment, increasing the value and cost efficiency of your pool year after year.
Electric heaters are more common today on the portable model spas. Most are a flow through design type heater with safety switches as part of the main control panel. Inground type heaters are a single unit complete with all safety switches contained inside and plumbed in line after the filter. Some inground spas are heated with natural or propane gas fired heaters. These are more cost effective to operate than electricity but not always available or practical.
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