What is the main reason for choosing a storage type water heater over an instantaneous type?

Choosing a storage type water heater over an instantaneous type is primarily due to its ability to smooth out peak demands on heating systems. Storage water heaters maintain a reservoir of hot water, which can be readily available during times of high usage, accommodating multiple simultaneous demands for hot water. This feature is particularly beneficial in residential settings or commercial applications where hot water is used frequently and simultaneously, such as during peak hours in the morning or evening.

In contrast, while instantaneous heaters provide hot water on demand, they may struggle to serve multiple points of use at the same time, leading to potential drops in temperature and inadequate supply when several outlets are drawing water simultaneously. Thus, the capacity of storage water heaters to provide a consistent supply makes them an ideal choice in scenarios where demand is variable, ensuring that users have immediate access to the required hot water.