Solar powered water heating systems come in 2 basic types, each of which can be useful to the subject's business or home setting in that they save on energy bills related to the employment of hot water. All these systems also have a backup heater so the water can be heated at points when there is not any daylight to be found to do the job. This is particularly crucial in climates that have many cloudy days in the winter months since no family wants to need to spend their days washing or cleaning without hot water. The active sun-powered water heating units are generally utilized in chillier climates, particularly the one that uses antifreeze in the pipes to act to warm the water in the storage tank. Passive solar water-heating units are sometimes employed in hotter areas where the temperatures don't drop below freezing for at least one or two hours in the night in winter time.

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