What is the primary purpose of a hot water cylinder?

The primary purpose of a hot water cylinder is to store and supply hot water for domestic or commercial use. These cylinders are designed to hold water that has been heated, allowing for a consistent supply of hot water when needed, such as for bathing, cooking, cleaning, or other daily activities. This system is particularly advantageous in situations where immediate access to hot water is necessary, as it ensures that the water is readily available at the desired temperature, contributing to both convenience and efficiency in residential or commercial settings.

In contrast, the other options describe functions that are not aligned with the design or purpose of a hot water cylinder. For instance, storing and supplying cool water doesn’t utilize the cylinder’s heating capability. Filtering water for drinking is performed by different types of systems focused on purification rather than storage and heating. Finally, heating water instantly as needed refers to systems like instantaneous water heaters, which operate differently than storage cylinders that rely on maintaining a reserve of pre-heated water.