If you’ve ever experienced the unpleasant surprise of stepping into a cold shower or finding only icy water coming from your hot tap, you know how disruptive a lack of hot water can be to daily life.
In Australia, hot water accounts for a third of the average household’s energy use, so when your hot water system malfunctions, it’s not just inconvenient – it can also lead to higher utility bills.
Don’t panic just yet, though! In many cases, you can troubleshoot and fix the problem yourself before calling a plumber. In this article, we’ll walk you through the most common causes of hot water system failure and provide step-by-step guidance on what to check for both electric water heaters and gas units.
Common Causes of Hot Water System Failure
Before you start tinkering with your hot water system, it’s helpful to understand the most frequent culprits behind a lack of hot water:
- Power supply problems (electric water heaters)
- Gas supply issues (gas water heaters)
- Faulty heating elements or thermocouples
- Leaks or damage to the tank or pipes
- Sediment buildup reducing efficiency
- Common issues with hot water heaters such as damaged pressure relief valves and faulty heating elements
Identifying the root cause will guide your troubleshooting efforts and help you determine whether a DIY fix is possible or if you need to call a plumber.
Troubleshooting Electric Hot Water Systems
If you have an electric water heater that’s not delivering the steamy showers you crave, here are a few things to check:
1. Power supply
- Ensure the unit is plugged in and the power outlet is working.
- Check your electrical panel for a tripped circuit breaker and reset it if necessary.
2. Heating element
- If you’re getting lukewarm water, the upper heating element may be failing.
- If there’s no hot water at all, the lower heating element may need replacement.
3. Leaks or damage
- Look for water leaks around the base of the unit or the connected pipes.
- Check the pressure relief valve for proper operation and signs of corrosion.
| Part | Problem | Solution |
| Heating element | Lukewarm water | Replace upper element |
| Heating element | No hot water | Replace lower element |
| Pressure relief valve | Leaking or corroded | Replace valve |
Troubleshooting Gas Hot Water Systems
For gas water heaters, check the following:
1. Gas supply
- Ensure the gas valve is turned on and there are no leaks in the gas line.
- Check if the pilot light is lit. If it’s out, follow the manufacturer’s instructions to relight it safely.
2. Thermocouple
- If the pilot light won’t stay lit, the thermocouple may be failing and need replacing.
3. Leaks or damage
- Inspect the burner for signs of damage or obstruction.
- Check the pressure relief valve and anode rod for leaks or corrosion.
General Troubleshooting Steps
Regardless of the type of hot water system you have, there are some universal steps you can take:
1. Water supply
- Check that the cold water shut-off valve is fully open.
- Ensure the pressure-reducing valve (if present) is adjusted properly.
- Ensure the hot water unit’s isolation valve is open and functioning properly.
2. Thermostat settings
- Adjust the temperature setting on the thermostat to ensure it’s not set too low.
- On gas systems, make sure the thermostat is calibrated correctly.
3. Sediment buildup
- Flush the tank annually to remove sediment that can reduce heating efficiency.
- Consider installing a water softener if you have hard water to prevent mineral buildup.
When to Call a Professional Plumber
While some hot water issues can be resolved with DIY troubleshooting, there are times when it’s best to call a licensed plumber:
- If you can’t identify the source of the problem with your water heater or your troubleshooting efforts don’t work
- If there are major leaks or visible damage to the tank or pipes
- If your hot water system is more than 10 years old and frequently needs repairs, it may be time for a replacement
A professional plumber can accurately diagnose the issue and make safe, lasting repairs. They can also advise you on the most efficient and cost-effective replacement options if needed.
Preventative Maintenance Tips
To minimise the risk of hot water interruptions and extend the life of your system, adopt these maintenance habits:
- Schedule annual inspections and services by a qualified plumber (like our team) to catch problems early
- Install a water softener if you have hard water to prevent damaging limescale buildup
- Insulate your hot water pipes to reduce heat loss and improve efficiency
- Flush the tank every 6-12 months to remove sediment
- Test the pressure relief valve regularly to ensure proper function
- Regular maintenance of your hot water heater can prevent unexpected breakdowns and extend its lifespan
Key Takeaways
- First, check the power supply, gas supply, and water shut-off valves
- Inspect the system for visible leaks or damage
- Adjust the thermostat settings and flush the tank to remove sediment if needed
- Call a licensed plumber if you can’t fix the issue yourself or there are major problems
- Schedule annual maintenance and take preventative measures to keep your hot water running smoothly.
Don’t let a lack of hot water disrupt your daily routine. With these troubleshooting tips and maintenance practices, you can keep your hot water system in top shape and enjoy reliable hot water all year round.
Dealing with hot water issues? Call our team now on (02) 6288 5123 for immediate assistance or book online.
Frequently Asked Questions
How long does a hot water system typically last?
The lifespan of a hot water system depends on factors like the type (electric or gas), brand, model, and maintenance. On average, electric hot water systems last 10-15 years, while gas systems can last 8-12 years. With proper maintenance, some high-quality systems may last up to 20 years.
How do I know if my hot water system needs to be replaced?
Signs that your hot water system may need replacement include:
- Age exceeding the expected lifespan
- Frequent repairs
- Visible rust or corrosion on the tank
- Water leaks or pooling around the base
- Inconsistent water temperature
- Unusual noises coming from the unit
If you notice any of these warning signs, consult a plumber to assess whether repair or replacement is more cost-effective.
How can I extend the life of my hot water system?
To maximise the lifespan of your hot water system:
- Schedule annual maintenance with a qualified plumber
- Flush the tank every 6-12 months to remove sediment buildup
- Install a water softener if you have hard water
- Insulate hot water pipes to reduce heat loss
- Fix any leaks promptly to prevent damage
- Adjust the thermostat to 60°C to prevent overheating and scalding
By following these tips and the preventative maintenance advice outlined earlier, you can keep your hot water system running efficiently for years to come.
