Waking up to no hot water is one of those problems that demands immediate attention. Before calling a plumber, there are several things you can check yourself that may resolve the issue — or at least help you describe the problem clearly when you do call.
1. Check Your Hot Water System’s Pilot Light (Gas Systems)
If you have a gas hot water system with a standing pilot light (common in older storage systems), the pilot may have blown out. Look for the pilot light inspection window on your system and check whether the flame is lit. If not, follow the manufacturer’s relight instructions on the unit’s label. If it won’t relight or keeps going out, call a licensed gas plumber.
2. Check the Thermostat Setting
Someone may have accidentally turned the thermostat down. On a storage hot water system, the thermostat is usually accessible behind a panel. It should be set to at least 60°C for Legionella prevention. If it’s set very low, adjust it and wait 30–60 minutes for the water to reheat.
3. Check Your Gas Supply
If your hot water is gas-powered, check that other gas appliances in your home are working (cooktop, heater). If no gas appliances work, there may be a supply issue — check the meter and call your gas provider if supply seems interrupted.
4. Check the Circuit Breaker (Electric Systems)
For electric hot water systems, check your switchboard. Look for a tripped breaker (usually labelled “HWS” or “Hot Water”) and reset it if tripped. If it keeps tripping, there’s an electrical fault in the system that needs a licensed electrician or plumber to diagnose.
5. Check the Relief Valve and Drain
All hot water systems have a temperature and pressure relief (TPR) valve with a drain pipe going to outside or a drain. If this valve has discharged (you’ll see water near the drain point), it may have released pressure and lost hot water. This indicates a pressure or temperature problem that needs a plumber to inspect.
6. Is the System Undersized for Current Demand?
If you’ve recently had more people in the home or changed your usage patterns, your storage system may be running out during peak demand. A continuous flow (instantaneous) system might be a better solution — call a plumber to discuss your options.
7. Check the Age of the System
Hot water systems have a typical lifespan of 8–12 years (electric storage), 10–15 years (gas storage), and 15–20 years (heat pump and solar). If your system is beyond that range and failing, replacement is usually more cost-effective than repair. A plumber can advise you quickly.
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When to Call a Plumber Immediately
Call a licensed plumber in Melbourne if:
- You can’t relight the pilot light or it keeps going out
- You see water leaking from the system
- The circuit breaker keeps tripping
- The system is making unusual banging or hissing noises
- The system is more than 10 years old and failing
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