Journeyman Plumber ExamPlumbing Code and RegulationsHard
A plumber is installing a hot water recirculation pump for a multi-story commercial building. The local plumbing code, based on the IPC, requires that all circulating hot water systems serving more than one dwelling unit or designed for recirculation must be provided with a means to automatically limit the water temperature to what maximum value?
- A140°F (60°C)
- B110°F (43°C)
- C105°F (41°C)
- D120°F (49°C)
Show answer & explanationAnswer & explanation
Correct answer: D. 120°F (49°C)
The IPC typically mandates that circulating hot water systems serving multiple units or for recirculation must have an automatic means to limit the hot water temperature to a maximum of 120°F (49°C) to prevent scalding.
Why the other options are wrong
- A. 140°F is generally the temperature for water heater storage but is too high for direct delivery to fixtures in multi-unit or recirculating systems without further tempering.
- B. 110°F is below the common maximum allowed for scalding prevention in these systems.
- C. 105°F is too low and would not meet user expectations for hot water.
Recirculating Hot Water Temperature Limit
The maximum permissible temperature for hot water delivered by a recirculating system, automatically limited to prevent scalding.
- Applies to multi-unit and recirculating systems.
- Typically 120°F (49°C) as per IPC.
- Achieved through thermostatic mixing valves or other automatic controls.
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