Published by JSR Electrical for Mackay homeowners. Not legal advice. Electrical and gas work must be carried out by appropriately licensed tradespeople. This page was not reviewed by a named individual expert.
No hot water on a Mackay winter morning — or lukewarm showers in a house full of guests — is miserable, but it is also easy to make worse with DIY gas or electrical tinkering. Use this page to narrow what you tell a licensed plumber (and, for some electric systems, a licensed electrician).
Symptoms worth describing clearly
- No hot water at any tap
- Hot water runs lukewarm only
- Hot water works sometimes (note time of day)
- Noise, leaking tank, or water around the unit
- Pilot / ignition concerns on gas units — do not open panels
System types JSR already services
Our plumbing and gas page covers electric storage, gas continuous-flow and solar hot water supply, installation and repair. Electric storage units may need coordinated electrical isolation — see also residential electrical services when switchboard or circuit issues are involved.
QBCC homeowner guidance (high level)
The Queensland Building and Construction Commission (QBCC) Home Owners Guide to Plumbing Matters explains that only limited minor tasks (such as certain washers or shower heads) can be done without a plumbing licence; most other plumbing and drainage work needs an appropriately licensed person. Owners must take reasonable steps to keep plumbing in good condition.
QBCC notes hot water systems should follow manufacturer service recommendations and are generally recommended for service about every five years by an appropriately licensed person. When a system is replaced, temperature control devices (such as tempering valves) may be required to reduce scalding risk; those devices need correct selection and periodic servicing. Thermostatic mixing valves require a plumber with the appropriate endorsement.
Gas smell overrides troubleshooting
If you smell gas, stop using the selector below for ‘tips’ and follow gas emergency practice: avoid sparks and flames, ventilate if safe, leave if anyone is at risk, and call emergency services / your gas emergency number. Licensed gas fitting is not DIY.
Next step
Request a free quote or call (07) 4863 0508. Bring the system type, age if known, and symptom notes from the tool.
Sources
Electric storage — what you can safely observe
From outside the unit you can note whether the isolator switch at the wall or board has tripped, whether the tank is leaking at fittings, and whether any hot taps on the property deliver heat. Do not remove the element cover. A tripped isolator that will not stay on is an electrical fault path — involve a licensed electrician as well as a plumber.
Gas continuous-flow — ignition is not a DIY project
Modern continuous-flow units have sealed combustion and electronics. Error codes on the display are useful to photograph for the technician; they are not an invitation to reset gas trains yourself. If you smell gas, evacuate the troubleshooting mindset entirely and follow emergency gas practice.
Solar hot water
Solar systems combine roof collectors, storage and often an electric or gas booster. Faults can sit in circulation, tempering, boosting or controls. QBCC emphasises using appropriately licensed people; booster elements again cross into electrical licensing when wiring is involved.
Tempering valves and scald protection
QBCC explains that temperature control devices limit hot water delivery temperature to reduce scalding risk, especially for children and older people, while storage temperatures still need to control Legionella growth inside the vessel. When systems are replaced, bringing tempering up to current expectations is commonly required. Tempering valves need maintenance; TMVs need endorsed technicians. None of that is washer-level DIY.
Finance options on larger replacements are discussed on our main site when you request a quote — we do not publish dollar estimates here because every dwelling differs.
Hard water and mineral build-up affect some North Queensland supplies over long periods; manufacturers’ anode and service schedules matter more in those conditions. Follow the appliance manual’s service interval when it is stricter than the general five-year reminder in QBCC’s homeowner guide.
Choosing repair versus replace (decision frame only)
Age, leak status, parts availability and energy type all influence whether a technician recommends repair or replacement. This article does not publish price bands. Ask for a written option comparison that includes tempering/TMV requirements on replacement and any electrical isolator upgrades needed for new electric units. Finance products advertised on JSR’s main site may apply to eligible larger jobs after a quote — confirm current offers when you enquire.
Homes in Marian, Mirani and Sarina face the same licensing rules as Mackay CBD; travel and parts lead times are the practical differences, not the safety standards.