In the absence of any building or mechanical codes that require otherwise, type M is the standard for copper tubing used in hydronic heating systems.

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Quizplus · Accepted Answer

Type M copper tubing is the most commonly used type of copper tubing for hydronic heating systems, in the absence of any building or mechanical codes specifying otherwise. It is suitable for low-pressure applications and is cost-effective.

In the Absence of Any Building or Mechanical Codes That