Electric hot water system not working? Few things are as jarring – or freezing – as turning on the tap for a hot shower only to be met with a shivering disappointment. When your electric hot water system isn’t delivering the warmth you expect, it can throw your daily routine into chaos. Whether it’s a complete lack of hot water or just a lukewarm trickle, the issue can stem from various causes – some simple, others more complex.
Focusing on electric systems here is key because, unlike gas hot water or solar hot water systems, they rely solely on electrical components like heating elements and thermostats, which have unique failure points. This distinction matters when troubleshooting, as the solutions differ from other system types. But before you panic or get back to Googling ‘why is my hot water not working,’ take a deep breath.
We’ve put together 8 key questions to help you troubleshoot why your electric hot water system is not working and guide you toward the next steps.
1. Is the power supply to your system interrupted?
With an electric hot water system not working properly, first things always come first:
Check the basics.
An electric hot water system relies on a steady power supply to function. If you’ve got a hot water tank not heating, the issue could be as simple as a tripped circuit breaker or a blown fuse. Head to your meter box or electrical panel and ensure the breaker for your hot water system is in the “on” position:
- If it’s tripped, reset it and monitor whether it trips again, as this could indicate a deeper electrical fault.
- Also check if the system is plugged in properly or if there’s been a recent power outage that might have disrupted its operation.
2. Is the thermostat set correctly?
The thermostat controls the temperature of your water, and if it’s malfunctioning or set too low, you might find be cursing to yourself: My electric hot water is only warm!
Most electric hot water systems have an adjustable thermostat, typically set between 50-60°C for safety and efficiency in Australian homes. If the setting has been accidentally lowered or if the thermostat is faulty, your water won’t heat adequately.
- Check the thermostat dial (sometimes easily accessible on the unit)
- Adjust it if needed (and if you can).
A faulty thermostat will require professional replacement.
3. Has the heating element failed?
The heating element is the heart of your electric hot water system, responsible for heating the water.
Over time, these elements can burn out or become coated with mineral deposits, especially in areas with hard water. Hot water not heating up? A failed or underperforming heating element could be the culprit.
Testing the element requires a multimeter to check for continuity, which is a job best left to a licensed hot water plumber unless you’re experienced – but you still need to be licensed!
4. Is there sediment buildup in the tank?
Sediment buildup is a common issue in electric hot water systems, particularly in older units or regions with mineral-rich water.
Over time, calcium and other minerals settle at the bottom of the tank, insulating the heating element and reducing efficiency. This can lead to situations where your hot water tank is not heating effectively or at all. Flushing the tank annually can help prevent this, but significant build-up may require professional cleaning or, in severe cases, tank replacement.
5. Is the system overloaded by demand?
If you’re asking, ‘why isn’t my hot water working?’ and the above questions haven’t led you anywhere, it might be worth considering your household’s water usage.
Electric hot water systems, especially storage tank models, have a finite capacity. If multiple people are showering, running the dishwasher, and doing laundry simultaneously, you might deplete the hot water supply, leaving you with cold or lukewarm water. If this happens frequently, it could be a sign that your tank is too small for your needs, and upgrading to a larger unit or a continuous flow system with adequate capacity might be the solution.
6. Is there a problem with the pressure relief valve?
The pressure relief valve is a safety feature that prevents excessive pressure build-up in your hot water system.
If the valve is stuck, leaking, or faulty, it can disrupt the system’s ability to maintain proper pressure and temperature, resulting in situations where you wonder, ‘why don’t I have hot water?’.
- Inspect the valve for leaks or corrosion
- Listen for unusual noises like hissing.
A faulty valve often needs replacement, which should be handled by a professional to ensure safety and compliance with Australian and Queensland standards.
7. Could there be a leak in the system?
A hidden leak in your hot water system or its associated pipework can reduce water pressure and heat, making it seem like your electric hot water is not working at all.
- Check around the base of the unit for puddles, damp spots, or corrosion.
Leaks can also occur in the pipes leading to or from the system, so inspect visible pipework for signs of water.
If you suspect a leak:
- Turn off the water
- Turn off the power supply to the unit
- Call a plumber immediately to prevent water loss or damage.
8. How old is your hot water system?
Age is a critical factor when troubleshooting why your hot water isn’t working.
Most electric hot water systems last 8-12 years, depending on maintenance and water quality. If your unit is approaching or exceeding this age, components like the heating element, thermostat, or tank itself may be failing due to wear and tear. Older systems are also more prone to corrosion and sediment issues.
If your system is nearing the end of its lifespan, replacing it with a modern, energy-efficient model may be more cost-effective than repeated repairs.
What to do when your electric hot water system isn’t working
After asking these questions, you should have a better idea of why your electric hot water system is not working. Simple fixes, like resetting a tripped breaker or adjusting the thermostat, can often be done at home. However, issues like faulty heating elements, sediment build-up, or leaks require professional expertise to diagnose and repair safely. Attempting complex repairs yourself can be dangerous and may void warranties or violate Australian plumbing regulations.
For reliable, long-term solutions, it’s best to call a fully-licensed plumber who can:
- Inspect and test all components of your hot water system.
- Flush or clean the tank to remove sediment.
- Replace faulty parts like thermostats, heating elements, or valves.
- Recommend whether repair or replacement is the best option.
- Ensure compliance with safety and plumbing standards.
S&J Plumbing And Gasfitting: Your hot water experts
At S&J Plumbing and Gasfitting, we understand how frustrating it is when your hot water system lets you down. Our team of experienced, licensed, friendly local Brisbane plumbers is dedicated to finding the root cause of your issue – not just patching up symptoms. Whether it’s a quick fix or a full system replacement, we’ve helped countless Australian households restore their hot water with minimal hassle.
Don’t put up with cold showers or unreliable hot water any longer – book a service with S&J Plumbing and Gasfitting today. Whether you are in Brisbane Northside, Brisbane Southside, Logan, Moreton Bay, Redland Bay, or Ipswich, we’ll get your system back in top shape.