Hot Water Not Working? Here's What To Do

Few things start the day worse than a cold shower. Before you assume the worst, some hot water problems have simple, safe checks you can do yourself, and knowing the common causes helps you explain the fault clearly when you call a plumber. Here are seven of the most common reasons your hot water has stopped, and what to do about each.

1. The pilot light has gone out (gas systems)

On older gas storage systems, a gust or a brief gas interruption can extinguish the pilot light. Many units have relighting instructions printed on a label near the controls. If you're comfortable following them and there's no smell of gas, you can try relighting it. If you smell gas at any point, stop, don't touch electrical switches, and call us. If the pilot won't stay lit, the thermocouple or gas valve may be failing. That's a repair.

2. Tripped circuit or blown fuse (electric systems)

For electric storage and heat pump systems, check your switchboard. A tripped safety switch or breaker labelled for hot water is a quick reset. If it trips again immediately, there's an electrical fault, stop and call a licensed professional.

3. Faulty thermostat

If your water is lukewarm rather than cold, or runs out far faster than it used to, a failing thermostat may not be heating the water to the right temperature. This is a common, fixable fault on both electric and gas storage units.

4. Failed heating element (electric systems)

Electric storage tanks heat water with an element, much like a kettle. When it burns out, you get cold or barely warm water. Elements are replaceable, a straightforward repair for a plumber.

5. Sediment build-up in the tank

Over years, minerals and sediment settle at the bottom of the tank. This reduces efficiency, causes rumbling or popping noises, and shortens the unit's life. Flushing can help, but heavy build-up in an ageing tank sometimes signals it's near the end.

6. A leaking or failing tank

If you see water pooling under the unit, that's serious. A steady leak from the tank itself usually means corrosion has set in and the cylinder is failing. These can't be repaired and the unit will need replacing. A leak from a valve or fitting, however, may just need a part.

7. The relief valve is discharging

A small amount of dripping from the temperature and pressure relief (TPR) valve is normal during heating. Continuous heavy discharge, though, points to a valve or pressure fault that needs attention, and running hot water down that valve wastes energy.

What safe checks can you do yourself?

• Confirm it's not an isolated tap issue, try hot water at more than one outlet.
• Check the gas supply is on and other gas appliances work.
• Check the switchboard for tripped switches (electric).
• Look for visible leaks or pooling water around the unit.
• Note the age of your system, most last 8 to 15 years.

If none of that solves it, or you're unsure, don't keep resetting or relighting repeatedly. Repeated faults mean something needs fixing.

Why do Bayside hot water systems fail?

Many bayside homes have hot water units tucked into external heritage-home cavities or exposed to the salt-laden air near Port Phillip Bay, which can accelerate corrosion on tanks and fittings. If your unit is over a decade old and playing up, it's worth having it assessed rather than repeatedly repaired. We'll give you an honest repair-vs-replace recommendation.