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3/74 Secam St

Mansfield QLD 4122

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Hot Water System Questions

May 27, 2025

They are absolutely the Best Plumbers in Brisbane. Unfortunately discovered water leaking on an exterior wall & through an inside wall from water pipes in the ceiling. Fortunately I know the best Brisbane Plumbers & emailed K-Oz. Owner Steve had Sam attend immediately & with Steve’s expert knowledge, a great solution was found. The ceiling pipe leak was capped & new copper pipe installed. Issue resolved I can’t thank you enough. If you want phenomenal knowledge & service, use K-Oz Plumbing. Thanks so much to Steve & the Team.

Ruth Craig

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No hot Water in Brisbane?

Safe Checks You Can Do Before You Call

No hot water can disrupt the whole household, especially when it happens suddenly. Before assuming the system has failed, there are a few safe external checks Brisbane homeowners can make.

This guide explains what you can look at without opening the unit, touching gas fittings, or attempting electrical work. If the issue continues, if the system is leaking, or if anything seems unsafe, K-Oz Plumbing & Gas can assess the problem and explain the next practical step.

For hot water help across Brisbane’s Southside, call (07) 3901 6042.

Quick Links:

  • Electric hot water checks
  • Gas hot water checks
  • When to stop and call a plumber
  • Common causes of no hot water
  • Repair or replacement considerations
  • FAQs

Electric Hot Water Checks

If your electric hot water system has stopped working, start with safe external observations only.

You can check:

  • Whether the issue affects every hot tap or only one outlet
  • Whether the water is completely cold or only cooler than usual
  • Whether there is visible leaking around the tank or valves
  • Whether there has been a recent power outage
  • Whether the switch or isolator appears to be on
  • Whether other electrical appliances in the home are working

If a circuit breaker has tripped, do not repeatedly reset it. Repeated tripping can point to an electrical fault that needs professional attention.

Possible causes of no hot water in an electric system can include a failed element, thermostat issue, electrical supply problem, tempering valve issue, leaking tank, or a system that has not reheated after heavy use.

Do not open the unit, remove covers, touch internal wiring, or attempt electrical testing.

Gas Hot Water Checks

Gas hot water systems need extra care. Do not attempt gas work yourself or remove covers from the unit.

You can safely observe:

  • Whether other gas appliances are working, if safe to check
  • Whether LPG bottles appear empty, if your property uses bottled gas
  • Whether the hot water system display shows an error code
  • Whether the unit is leaking
  • Whether the issue affects every hot tap
  • Whether there has been a recent gas supply interruption or storm

If you smell gas, stop using the appliance and seek professional help. If there is a fire, explosion, uncontrolled gas leak, or immediate danger, call 000.

Avoid generic pilot-light instructions unless the specific manufacturer instructions are available and safe for the customer to follow. Do not encourage homeowners to open panels, bypass safety features, or attempt gas repairs.

When to Stop and Call a Plumber

Stop checking and call for help if:

  • You smell gas
  • The hot water system is leaking
  • The system repeatedly trips power
  • An error code keeps returning
  • The unit will not ignite
  • Hot water is cutting in and out
  • The water temperature changes suddenly
  • You are unsure whether the system is safe
  • The tank appears damaged or ruptured

K-Oz Plumbing & Gas can inspect the system and explain whether repair, servicing or replacement is the better next step.

K-Oz Plumbing & Gas Can Help With

K-Oz Plumbing & Gas can assist Brisbane Southside homeowners with:

For broader repair, replacement and system options, learn more about hot water services.

Saxon Hot Systems

Fill Saxon hot water tank up
  • If you have a Saxon hot water system you may have to top up the tank. 
  • Once every six months the pressure relief valve must be checked by the owner. To top up the tank and check the valve, lift the valve lever against the spring pressure until water flows from the overflow pipe. When water flows from the overflow, restore the lever to its original position. (Do not let the lever snap back, as this may damage the valve seat). As cold water is introduced into the tank, it will expand and continue to flow for some time. It is good idea to do this check whenever you receive your electricity bill. If water does not flow freely – Call K-Oz Plumbing

Frequently Asked Questions

Check your power source i.e. circuit board hasn't tripped, gas supply has not run out or been cut. See above for FAQ's on no hot water 

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