What Sydney adds to a hot water repair
No hot water on a frosty morning
Camden Airport averages 16.2 days a year at or below 0°C, and Bankstown Airport 0.9. If the hot water stops on one of those mornings, the pipes may simply be frozen. Sydney Water's advice is to let them thaw as the day warms up and never pour boiling water on them, because they can crack.
The valve test Sydney Water uses
Sydney Water says the expansion valves near the top of a hot water system shouldn't leak constantly after a stretch with no hot water used. Check first thing in the morning: steady water from the valve then is a repair job.
Water hardness of about 57 mg/L
That's Sydney Water's figure for Greater Sydney, well under the 200 mg/L guideline set to limit scale in hot water systems. Ask the plumber what they actually find inside rather than assuming scale.
Leaks near the heater in a unit
In NSW strata, the owner usually covers plumbing in internal walls and fixtures, and the owners corporation covers plumbing in boundary walls and under the floor. A leak beside the heater could be either, so check before you pay.
Quick checks before you book
- Electric system: is its switch on at the switchboard, and has a safety switch tripped?
- Gas system: is the pilot alight, or is the unit's display showing an error? Is gas reaching your other appliances?
- Water at the base: is it coming from a fitting or valve, or from the tank body itself? The tank body leaking means replacement, not repair.
- Hot at some taps only: the heater may be fine and the problem in the pipework or a single tap.
- Smell gas? Stop and follow the NSW gas leak steps on our gas fitter page.
How a Sydney repair call usually goes
Diagnosis
A hot water specialist tests the parts that commonly fail on your type of system before quoting anything.
A straight answer on repair or replace
If the tank is sound, the repair is usually a part. If it's leaking from the body, you'll be told it's time for a replacement, which in NSW brings its own tempering valve rule.
Licences for the work
Contracting for any plumbing repair in NSW needs a contractor licence, however small the job. Anything on the gas side needs a licensed gasfitter, and once gas work is done they must give you a certificate showing their name and licence number.
Be wary of
- A replacement quote before anyone has tested a single part.
- Being rushed. Plumbing businesses NSW banned in June 2026 were found to have misrepresented urgency and overcharged.
- No written quote and no itemised invoice. Both were among the practices NSW found in those cases.
What we would do
Do the quick checks, and on a frosty morning out west let the pipes thaw as the day warms up before you assume the worst. If the hot water is still off, book a repair rather than a replacement, and ask the plumber to show you the failed part. Only once they've shown you the tank itself is leaking is it time to talk about a new system.