Inadequate Hot Water Overflow Drainage
Inadequate Hot Water Overflow Drainage is a high-severity plumbing defect SURE inspectors have documented across 101 inspection reports. Highest concentration in Ellenbrook.
Causes
- Improper installation or maintenance of hot water overflow outlet.
- Improper installation or connection of overflow drain
Symptoms to look for
- Excess water ponding alongside walls and into perimeter footings from hot water overflow
- Hot water overflow releasing water alongside or near building walls, creating wet areas.
Remedies
- Engage a landscaper or plumber to divert into a drain or further from the dwelling's wall or footings
- Divert hot water overflow away from the building perimeter, preferably by connecting it to a drain.
Where we see this most
These suburbs show the highest concentration of inadequate hot water overflow drainage in our inspection data (minimum five observations). Click a suburb to see its full defect profile.
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Curated entries in Plumbing
- Curated 2–4/5Air Conditioner Overflow Not Diverted
The condensate overflow pipe from the air conditioning unit is discharging at or near the building perimeter rather than into a drain or away from the structure. Persistent moisture against the slab or wall base creates conducive conditions for termite ingress and can accelerate mortar deterioration over time.
- Curated 2–4/5Hot Water Overflow Not Sufficiently Drained
The TPR (temperature pressure relief) or overflow pipe from the hot water system discharges near the building perimeter rather than into a dedicated drain, directing water against the slab edge and creating sustained moisture - a recognised conducive condition for subterranean termites. AS/NZS 3500.4 requires relief valve discharge to be piped to a safe, visible location away from the structure.
- Curated 2–4/5Galvanic Corrosion from Mixed Metal Pipework
I traced the potable water pipework and found dissimilar metals joined directly - most often copper connected to older galvanised steel with no dielectric break. Reference: AS/NZS 3500.1. In my experience the galvanic cell at the junction accelerates corrosion, narrowing the bore, discolouring the water, and eventually causing pinhole leaks. I see this most on partial re-pipes over an older galvanised system.
- Curated 3–5/5Polybutylene Pipework in Potable Water System
I identified grey polybutylene pipework in the dwelling, installed during the late 1970s to mid-1990s window. The product was the subject of successive Plumbing Code advisories following widespread failures at acetal junction fittings. In my experience the risk of sudden splits and connection blow-outs rises sharply past 20 years of service, and I know insurers routinely flag or exclude cover on homes still running the system.
- Curated 3–5/5Stormwater Cross-Connected to Sewer Drain
I investigated a sewage odour reported after rain and traced a downpipe, surface drain, or sub-soil line into the sanitary sewer - an illegal cross-connection. Reference: AS/NZS 3500.3. In heavy rain the extra hydraulic load surcharges the sewer main, and in my experience sewage can back up into the house through floor wastes and gully traps. Owners also face penalties from the water authority.
- Curated 3–5/5Hot 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.