Defect type
Critical · 3–5/5
Hot Water System TPR Discharge Pipe Non-Compliant
I followed the temperature and pressure relief valve discharge line from the storage hot water unit and it does not match the reference requirements I work from in AS/NZS 3500.4. I commonly record over-long runs, no visible air gap at the termination, upward runs that trap water, or the line terminating inside a cupboard or roof space. A failed discharge path stops the valve venting safely if it sticks - a scald and pressure hazard in my view.
Causes
- DIY or unlicensed replacement of the hot water unit
- Relocation of the unit without reworking the discharge route
- Unit installed in a position where a proper external discharge route is difficult
Symptoms to look for
- Discharge pipe terminating inside a cupboard, roof space or sub-floor
- Discharge line with upward runs, sharp bends or a flattened drain gradient
- No visible tundish or air gap at the point of discharge
Remedies
- Engage a licensed plumber to re-pipe the discharge line (reference AS/NZS 3500.4)
- Install a tundish or suitable air break at the termination
- Verify the relief valve is serviceable and replace if older than manufacturer guidance
Critical
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