The cold water inlet supply to an instantaneous multi-point water heater is typically taken from where?

The cold water inlet supply to an instantaneous multi-point water heater is typically taken from the cold mains supply. This is because instantaneous water heaters require a constant supply of cold water at a specific pressure to ensure that they can heat water on demand without the need for a storage tank. The cold mains system is designed to deliver pressurized water directly from the municipal water supply, ensuring a reliable and adequate flow for heating.

Using water from storage tanks, rainwater harvesting systems, or private wells would not be as reliable due to potential issues with pressure and availability. For instance, storage tanks may not provide the continuous flow needed, and harvested rainwater may not always meet potable water quality standards. Private wells depend on the local geology and pump system, which can also introduce variability in pressure and flow rate. Therefore, the cold mains supply is the most appropriate and effective source for instantaneous multi-point water heaters, ensuring optimal performance and efficiency.