When the hot water stops, the first question is usually whether it can be fixed or whether it is time for a new system. The answer depends on what has failed, how old the unit is and what kind of system you have.
Faults that can usually be repaired
- Thermostats and heating elements on electric storage systems.
- Temperature and pressure relief valves that drip constantly or have stopped working.
- Pilot, thermocouple and gas control faults on gas storage systems.
- Ignition, flow sensor and fan faults on continuous flow (instantaneous) gas units.
- Sacrificial anodes that have been used up, replaced before the tank itself starts to corrode.
When replacement is the better call
- The tank is leaking. Once the inner lining has corroded through, there is no lasting repair.
- Rusty water from the hot taps only. This usually means the tank is corroding from the inside, as in our hot water fault write-up.
- The system is old. Storage tanks commonly last somewhere around 8 to 12 years. Spending on a major repair near the end of that window rarely pays off.
- It no longer suits the household. More people, a new bathroom or rising energy costs can all justify a change.
The main types of system
- Electric storage. Simple and inexpensive to install, but usually the most expensive to run unless it is on an off-peak tariff.
- Gas storage. Heats quickly and handles high demand well. Needs a gas connection and a compliant flue or outdoor location.
- Continuous flow gas. Heats water only when a tap is on, so it never runs out and does not lose heat from a tank. Sized by flow rate rather than litres.
- Heat pump. Works like a reverse air conditioner, drawing heat from the air into the water. It uses a fraction of the electricity of a standard electric tank and pairs well with rooftop solar.
- Solar. Roof collectors with an electric or gas booster for cloudy days.
Heat pump and solar systems may be eligible for incentives under federal and NSW energy schemes. The rules change from time to time, so check the current eligibility before you decide.
Getting the size right
Too small and the last shower runs cold; too big and you pay to keep water hot that you never use. Sizing depends on how many people live in the home, how many bathrooms there are and when everyone showers. It is worth getting this right rather than simply replacing like for like.
Talk to us before you decide
Our hot water repairs and replacement service covers every system type. We will tell you honestly whether a repair is worth it, and if not, what the realistic options are for your home. No hot water at all? That is part of our 24/7 emergency service.
We look after homes across the Northern Beaches and the North Shore, including Frenchs Forest, Forestville and Lane Cove.
