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What is the Cold Water Sandwich?

The cold water sandwich is largely a thing of the past, as the new generation of tankless systems has been designed to avoid this problem. However, in older tankless models, warm water already present in the system would be pushed out as the hot water was turned on, and cold water would enter and exit the system before it was fully heated. Consequently, a brief moment of colder water occurred until the burner could catch up. However, newer systems slow incoming water down for several seconds so that it is dispensed at the proper temperature.

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What is the Cold Water Sandwich?