HOT WATER COMPLIANCE

Commissioning a hot water system: the final checks

The install can be perfect and still fail at handover if the final checks were skipped. Commissioning is the short, deliberate run-through that confirms the system is safe before you pack up.

What commissioning confirms

Commissioning is the point where you prove the system works as intended: it heats, it is safe, and the delivered temperature is right. It is also the natural moment to capture the record, because everything is in front of you and working.

The final checks

• Delivered temperature measured at the fixture, at or below 50°C.
• The relief valve operates and its drain line runs clear to the safe point.
• Expansion control is in place and, for a vessel, the pre-charge is set and labelled.
• No leaks at connections under pressure.
• Rating plate readable, and the unit accessible for service.

What to record at handover

Capture the measured delivery temperature, the relief valve and drain, and the overall install. A short, dated record of the commissioning checks is the thing that protects you if the system is ever questioned. Elemetric runs this list and files it into a signed record as you finish.

Common questions

What are the final checks before leaving a hot water job?

Delivered temperature measured at or below 50°C, the relief valve operating with a clear drain line, expansion control in place, no leaks under pressure, and the rating plate readable with the unit accessible.

Why record the commissioning checks?

A short, dated record of the final checks is what protects you if the system is ever questioned, and everything is in front of you to capture at handover.

General information for licensed tradespeople, not legal or regulatory advice. The licensed plumber remains solely responsible for compliance. Refer to the current AS/NZS 3500 standards and the Building and Plumbing Commission (formerly the VBA) for authoritative requirements.