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A water softener plays a crucial role in hot water systems primarily by removing minerals that contribute to hardness, such as calcium and magnesium. When water hardness is not addressed, it can lead to scale buildup within pipes and appliances, reducing efficiency and potentially causing damage over time. Softening the water helps to prevent this issue by replacing these hard minerals with sodium or potassium ions through a process known as ion exchange. This process not only protects the plumbing system but also enhances the longevity and efficiency of water heaters and other appliances that use hot water.

The removal of hard minerals also results in softer water, which can improve the effectiveness of soaps and detergents, leading to better cleaning results. Additionally, it can have a positive impact on skin and hair when used for bathing. Therefore, the primary function of a water softener in hot water systems is to remove minerals and prevent scale buildup while also providing additional benefits in terms of cleanliness and equipment longevity.