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2024 International Residential Code (IRC)
Chapter 21 Hydronic Piping

Quiz: 2024 International Residential Code (IRC) Chapter 21 Hydronic Piping

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1. According to Table M2101.1, which of the following hydronic piping materials is approved for use in radiant systems but only for temperatures below 180°F (82°C)?

Copper and copper-alloy tubing
Cross-linked polyethylene (PEX)
Steel pipe
Acrylonitrile butadiene styrene (ABS) plastic pipe

2. What type of joint is specifically permitted for copper and copper-alloy tubing when embedded in concrete?

Soldered joints
Flared mechanical fittings
Brazed joints
Press-connected fittings

3. Hydronic piping systems must be installed to permit draining of the system. What is the exception to this requirement?

Systems installed in attics.
Buried portions of systems embedded underground or under floors.
Systems using non-toxic antifreeze.
High-pressure systems.

4. How shall the potable water system be protected from backflow when connected to a hydronic system?

By installing a bypass valve.
By conforming to the provisions of Section P2902.
By adding a chemical treatment to the hydronic fluid.
By ensuring the hydronic system operates at a lower pressure than the potable water system.

5. What is required for openings through concrete or masonry building elements where hydronic pipes penetrate?

They must be sealed with fire-rated caulk.
They must be sleeved.
They must be larger than the penetrating pipe by at least 1 inch.
They must be filled with insulation.

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