What is the working principle of an indirect hot water storage vessel?

The working principle of an indirect hot water storage vessel involves using a heat exchanger to transfer heat from an external source, such as a boiler or an immersion heater, to the water stored in the vessel. This method allows for efficient heating without the need for direct combustion within the water storage tank.

In an indirectly heated double feed system, the tank is fed with two separate water flows. One feed comes from the heat source to provide the heat exchange required for warming the water, while the other provides cold water to be heated. This setup enhances the efficiency of maintaining hot water temperatures and allows for better volume control, as the tank can accommodate various demands without overworking the heating system. Essentially, the external heater warms the water indirectly, allowing for a consistent supply of hot water while minimizing the risk of overheating by controlling the temperatures more effectively.

This method is advantageous for systems needing larger volumes of hot water or when integrating with renewable energy sources, as it separates the heating source from the water supply, offering more flexibility and control over water temperatures while ensuring that the heating process is safe and efficient.