Especially does this in the morning, because doing so doing so during afternoons might cause the class tube to crack, due to a sudden change in the temperature. Although the tube has been designed to take this pressure, yet it is a point to be careful about.
The best way to reduce this heat loss is to minimize the time gaps between water usages. The water present in the pipeline is usually cooler than the water in your storage tank. So, do wait while the cold water goes out of the pipeline and hot water has filled up again. This hot water loses its heat.