Plumber Red Seal · Question
Before replacing a gas-fired water heater, which procedure is critical for ensuring safety?
The most critical safety step is to isolate the energy source. For a gas appliance, this involves shutting off the gas supply using the nearest shut-off valve a
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
Question: Before replacing a gas-fired water heater, which procedure is critical for ensuring safety?
Answer options:
- Draining the tank completely.
- Turning off the electrical power at the breaker panel.
- Shutting off the main water supply to the building. ✅ Shutting off the gas supply and locking/tagging the valve.
Correct answer: Shutting off the gas supply and locking/tagging the valve.
Explanation: The most critical safety step is to isolate the energy source. For a gas appliance, this involves shutting off the gas supply using the nearest shut-off valve and applying a lockout/tagout (LOTO) device to prevent it from being turned on accidentally.
Start free practice for Plumber Red Seal
177 questions · no signup required · 40 free questions per day
More about Plumber Red Seal
Related Questions
- Before starting a new plumbing installation in a residential basement, what is the primary reason why a plumbe
- A plumber is installing a new kitchen sink in an existing residential dwelling. The sink drain is connected to
- A plumber is installing drainage for a dishwasher in a residential kitchen. The dishwasher P-trap is located 1
- A plumber is asked to install a backflow prevention assembly on a lawn irrigation system connected to the pota
- A plumber is considering the velocity of water in a 50 mm (2") copper pipe supplying a commercial building. Ex
- A plumber is designing the domestic hot water recirculation system for a multi-story residential building. Wha
More for Plumber Red Seal candidates
Practice tests
Question explanations
- Before starting a new plumbing installation in a residential basement, what is the primary reason why a plumbe
- A plumber is installing a new kitchen sink in an existing residential dwelling. The sink drain is connected to
- A plumber is installing drainage for a dishwasher in a residential kitchen. The dishwasher P-trap is located 1
- A plumber is asked to install a backflow prevention assembly on a lawn irrigation system connected to the pota
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Plumber Red Seal Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.