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The indirect boiler system is characterized by its use of a separate water heating tank. In this system, water is heated in a separate storage tank rather than directly in the boiler. The heated water is then circulated to taps and appliances as needed. This design allows for more efficient heating, as the system can use the heat produced by the boiler to warm the water in the tank, ensuring a consistent and readily available supply of hot water.

In contrast, a direct boiler system heats water directly within the boiler itself without the use of a separate tank. This method often provides hot water on demand, but it may not maintain the same level of efficiency or consistency in water temperature compared to an indirect system with a dedicated tank.

Understanding these distinctions helps clarify the advantages of having a separate heating tank in the indirect boiler system, particularly in terms of efficiency and hot water availability.