Plumber Red Seal · Question
You are replacing a shower valve in a residential dwelling. The existing valve does not have a pressure-balancing or thermostatic feature. To comply with modern plumbing codes and ensure user safety, which type of valve should you install?
Modern plumbing codes, including the National Plumbing Code of Canada (NPC), require shower valves to be equipped with a pressure-balancing or thermostatic mixi
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Question: You are replacing a shower valve in a residential dwelling. The existing valve does not have a pressure-balancing or thermostatic feature. To comply with modern plumbing codes and ensure user safety, which type of valve should you install?
Answer options:
- A two-handle compression valve ✅ A single-handle non-scald valve
- A simple mixing valve
- A gate valve
Correct answer: A single-handle non-scald valve
Explanation: Modern plumbing codes, including the National Plumbing Code of Canada (NPC), require shower valves to be equipped with a pressure-balancing or thermostatic mixing feature, commonly referred to as a non-scald valve, to prevent sudden temperature changes and protect users from scalding. Two-handle compression valves or simple mixing valves lack this safety feature, and a gate valve is for isolation, not temperature control.
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