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If there is no backflow preventor and the heating system is direct connected to the domestic system, is the hydronic piping no longer hydronic piping?

April 26, 2017backflow connected domestic heating hydronic longer Piping preventor system

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If there is no backflow preventor and the heating system is direct connected to the domestic system, is the hydronic piping no longer hydronic piping?

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An “open system” is still considered a hydronic piping system, but is regulated under the plumbing code, because it uses the domestic potable water as its heating medium.