Gas Hot Water Systems

A gas hot water system is a water heating solution that uses natural gas or LPG to heat water for household or commercial use. Available in two main types - continuous flow (instant) and storage tank - gas systems are known for fast heat recovery, reliable performance, and lower running costs compared to standard electric systems. They are a popular choice across Queensland for homes and businesses that want consistent hot water without the upfront cost of solar or heat pump technology.

A gas hot water system works by burning natural gas or LPG to heat water either on demand or in a storage tank. In a continuous flow system, cold water passes over a heat exchanger where a gas burner heats it instantly as it flows through. In a storage system, a gas burner heats water held in an insulated tank and a thermostat maintains it at the set temperature. Both types use a pilot light or electronic ignition to start the burner, and a safety shutoff valve cuts the gas supply if the system detects a fault.

The right size depends on the number of people in your household and your daily hot water usage. A continuous flow system rated at 16-20 litres per minute suits most homes, while larger households may need 26-32 litres per minute. For storage tanks, 135-160 litres suits 1-3 people, 160-250 litres for 3-4 people, and 250-315 litres for larger households.

A gas hot water system typically lasts 10 to 15 years with regular servicing. Continuous flow systems generally last longer than storage tanks as they have fewer components under constant thermal stress. Annual servicing by a licensed gas fitter helps extend lifespan, maintain efficiency, and keeps the system compliant with Australian safety standards.

For a continuous flow gas system, simply turn on your hot water tap - the system ignites automatically when water flows. For a gas storage system, locate the gas valve at the base of the unit, turn it to the pilot position, press and hold the ignition button until the pilot light is lit, then turn the valve to the on position and set your desired temperature. If the pilot light won't stay lit, the thermocouple may need replacing - call SunCity Hot Water on 1300 728 122 for a prompt repair across the Sunshine Coast, Brisbane and Gympie.