A plumber is installing a new natural gas-fired domestic hot water heater in a residential dwelling. The manufacturer's instructions specify a minimum 250 mm clearance from combustibles to the vent connector. The existing installation has the vent connector running parallel to a wooden ceiling joist with only 150 mm clearance. What is the most appropriate action for the plumber to take?

Question: A plumber is installing a new natural gas-fired domestic hot water heater in a residential dwelling. The manufacturer's instructions specify a minimum 250 mm clearance from combustibles to the vent connector. The existing installation has the vent connector running parallel to a wooden ceiling joist with only 150 mm clearance. What is the most appropriate action for the plumber to take?

Answer options: ✅ Re-route the vent connector to achieve the specified 250 mm clearance from the wooden joist.

• Install a metal shield between the vent connector and the wooden joist.
• Apply a fire-resistant coating to the wooden joist where it is close to the vent connector.
• Proceed with the installation as the 150 mm clearance is generally acceptable for residential applications.

Correct answer: Re-route the vent connector to achieve the specified 250 mm clearance from the wooden joist.

Explanation: The most appropriate action is to re-route the vent connector to achieve the manufacturer's specified clearance. Manufacturer instructions and code requirements for clearances to combustibles are critical safety measures and must be strictly followed to prevent fire hazards. Metal shields or fire-resistant coatings may reduce some fire risk but do not replace the necessity of proper clearance as per specifications.