Check Your Hot Water System Before Winter in Brisbane

As cooler weather approaches in Brisbane, it’s a good time to check that your hot water system is operating safely and efficiently. While Brisbane winters are mild compared to other states, hot water systems still work harder during this time of year and existing issues often show up when demand increases.

Checking your hot water system before winter can help prevent breakdowns, improve efficiency, and reduce the risk of unexpected repairs when you need hot water most.

Why checking your hot water system before winter matters

Reliable hot water when demand increases

Hot water usage typically increases in cooler months. A system that is already struggling may fail under extra demand, leaving you without hot water when you rely on it most.

Prevent unexpected breakdowns

Many hot water failures are caused by components that deteriorate slowly over time. A pre-winter check can identify worn valves, failing parts, or early signs of corrosion before they lead to a complete system failure.

Improve efficiency and running costs

Sediment build-up, faulty valves, or ageing components can reduce system efficiency. An inefficient system often uses more electricity or gas, increasing energy bills over winter.

Maintain safety and compliance

Hot water systems operate under pressure and high temperatures. Regular checks help ensure safety components such as pressure relief valves and tempering valves are functioning correctly and meeting Queensland plumbing requirements.

Signs your hot water system may need attention

If you notice any of the following, it’s a good idea to have your system inspected:

• Inconsistent or fluctuating water temperature

• Reduced hot water supply

• Unusual noises such as banging or rumbling

• Rusty or discoloured hot water

• Water leaks around the system or valves

• A system that is more than 8–10 years old

Addressing these issues early can prevent larger, more expensive problems.

What homeowners can safely check themselves

Homeowners can carry out basic visual checks without touching plumbing, gas, or electrical components:

• Check for visible leaks around the unit and pipework

• Look for signs of corrosion or rust on the system

• Listen for unusual noises during heating cycles

• Ensure the system appears secure and upright

⚠️ Homeowners should not attempt repairs, valve adjustments, or component replacements. These tasks must be carried out by a licensed plumber or gas fitter.

Important safety components to be aware of

Tempering valves

In Queensland, tempering valves are required to ensure hot water delivered to bathrooms is kept at a safe temperature (typically no more than 50°C) to reduce the risk of scalding.

Pressure and temperature relief valves (PTR)

These valves are critical safety components that release excess pressure from the system. A faulty PTR valve can pose serious safety risks.

Expansion control valves (ECV)

ECVs help manage pressure fluctuations in plumbing systems and protect pipework and fixtures.

As a general guide, PTR valves, ECVs, and tempering valves should be inspected regularly and typically replaced every five years, depending on system type and manufacturer recommendations.

How often should a hot water system be serviced?

For most Brisbane homes:

• Electric hot water systems: Every 12–24 months

• Gas hot water systems: Every 12 months

• Instantaneous systems: Every 12 months

Regular servicing helps extend system lifespan, maintain efficiency, and reduce the risk of sudden failure.

When to call a licensed plumber

You should contact a licensed plumber if:

• You notice leaks or corrosion

• Water temperature is inconsistent

• Safety valves are constantly discharging

• Your system is ageing and hasn’t been serviced

• You’re unsure whether components need replacing

Professional inspection ensures your system remains safe, compliant, and reliable.

Need your hot water system checked before winter?

If your hot water system is due for a service or showing signs of wear, a licensed plumber can inspect the system and advise on maintenance, repairs, or replacement if required.

Howzat Plumbing services Brisbane and surrounding areas, including the Northside, Southside, Moreton Bay, and surrounding suburbs, providing reliable hot water system inspections and servicing.

For a full guide on hot water maintenance year-round, see our article on how to maintain a hot water system in Brisbane’s climate.