General guidance, not an inspection or diagnosis. Repair advice has not been independently reviewed by a tradesperson. How these guides are prepared.
What to do now
If you smell gas, hear hissing, see leaking near electrical components or the unit is overheating, keep clear and arrange urgent licensed help.
Common causes
- Failed heating element or thermostat
- Gas ignition or supply fault
- Pressure / tempering valve issue
- Ageing or leaking storage tank
The exact cause cannot be confirmed from a symptom alone. The first professional should inspect before repair work is authorised.
What the professional may do next
- Identify system type and age
- Check for visible leaks or fault codes
- Test heating and safety components
- Repair or compare replacement cost
What should I ask about the price?
Ask for an itemised quote covering the inspection or call-out fee, labour, materials, GST, access, disposal and any after-hours charge. Ask what happens if extra damage is found. A reliable price needs details of the actual job; this guide does not provide an estimate.
Who may be responsible?
Owner / landlord
In a rental, loss of hot water can require prompt landlord/property-manager action. Emergency rules vary by state.
Tenancy, strata, insurance and boundary responsibilities vary by circumstance and state, so confirm responsibility before non-emergency work where practical.
Questions to ask before hiring
- Are you appropriately licensed or registered for this work in my state?
- Does the quote include call-out, labour, parts/materials, GST and disposal?
- What is excluded from the quoted scope?
- If you find additional damage, will you get approval before doing extra work?
- What workmanship or product warranty applies?
Describe which outlets are affected
Record whether the issue affects every hot-water outlet or only one, and whether water is cold throughout or turns cold after use. Do not test water with your hand if scalding or unstable temperatures are suspected.
Identify the system without opening it
If safely accessible, note the system brand and model and whether it is gas, electric, solar or heat pump. Do not open electrical covers, relight equipment or operate valves to investigate. Tell the repair business if you do not know the system type.
Compare the proposed scope
Ask whether the quote is for diagnosis, a component repair or complete replacement. Check access, disposal, required trades, connections and any additional work. Ask the technician to explain the evidence behind a replacement recommendation.
Sources and review status
Prepared for Home Triage Australia. Updated 25 October 2026. This guide has not been independently reviewed by a qualified tradesperson. The sources below support general maintenance and hiring principles, not a diagnosis of your property.
Run this problem through the checker, then contact a suitable professional of your choice.
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