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On-Demand Heater Plumbing Diagram

This shows a typical tankless water heater system. An expansion tank is typically installed on the cold water inlet but can be installed on the hot water supply after the water heater. The use of the strainer is highly recommended. The purge and pressure/temp relief valve are typically used when the building outlets are safety fixtures.

Plumbing Diagram of an on-demand water heater

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