How Often Should You Service a Gas Heater? Complete Maintenance Guide

Most Sydney homeowners only think about their gas heater when it stops working or when winter hits and the house is freezing. As a trusted plumber Sydney locals rely on for heating maintenance, Hero Plumbing wants to help you stay ahead of problems before they happen. This complete gas heater maintenance guide covers how often you should service your heater, what a service involves, and why doing it before winter could save you money and keep your family safe.

How often should a gas heater be serviced?

The Australian Gas Association recommends that gas heaters be professionally serviced at least once every two years as an absolute minimum. However, most manufacturers and licensed gas fitters in Australia recommend annual servicing, particularly for:

• Heaters that run for extended periods during winter
• Units that are more than five years old
• Households with young children, elderly residents, or anyone with asthma or respiratory conditions
• Properties where the heater is the primary heating source
• Unflued gas heaters, which release combustion gases directly into the room

Annual servicing is the best way to catch problems before they become expensive repairs or safety hazards. A heater that failed inspection in April is a heater that gets fixed before June, not one that leaves you scrambling for a technician on the coldest night of the year.

Do gas heaters need servicing?

Yes, absolutely. Like any gas appliance, a gas heater has components that wear, accumulate deposits, and degrade over time. Without regular servicing, a gas heater can develop carbon monoxide leaks, gas leaks, ignition failures, and inefficient combustion that pushes your energy bills up without delivering more warmth.

Skipping a service does not just risk a breakdown. It risks your family’s safety. Read our guide on what you should know about servicing a gas heater for a full breakdown of the risks.

What is included in a gas heater service?

A professional gas heater service from Hero Plumbing’s gas heater service team in Sydney covers the following:

• Full visual inspection of the heater, flue, and gas connections
• Burner cleaning and adjustment
• Heat exchanger inspection for cracks or damage
• Pilot light and ignition system check
• Thermocouple test and replacement if required
• Gas pressure and flow test
• Carbon monoxide emissions test
• Safety control and limit switch verification
• Flue draught and combustion air check
• Filter clean (where applicable)

What happens if you don’t service your gas heater?

An unserviced gas heater is not just a comfort risk. It is a financial and safety risk. Here is what can happen:

• Dust and debris accumulate on the burner, reducing efficiency and increasing gas consumption
• The heat exchanger develops cracks that allow combustion gases, including carbon monoxide, to enter the room
• The thermocouple wears out and the heater stops working entirely
• Gas connections and valves deteriorate, increasing the risk of a gas leak
• The flue becomes blocked, causing combustion gases to vent back into the home

Gas heater maintenance tips between services

Between annual professional services, there are some basic maintenance steps you can do yourself to keep your heater running well:

• Keep the area around the heater clear of dust, flammable materials, and furniture
• Clean or replace the air filter as per the manufacturer’s schedule
• Check the pilot light is burning blue, not yellow or orange
• Ensure all air vents and flue outlets are unobstructed
• Test your carbon monoxide alarm monthly

When should you service your gas heater: the best time of year

The ideal time to book a gas heater service in Sydney is April or May, before the winter heating season begins. Technicians are less busy in autumn, which means faster appointment availability and no risk of waiting weeks for a service while the cold sets in. Trying to book a service in June or July during peak heating season often means longer wait times and the possibility of using an unsafe heater in the interim.

Hero Plumbing services all major brands including Rinnai, Rheem, Everdure, Paloma, and Omega Altise.

When to replace instead of service

If your heater is more than 15 years old, has been repeatedly repaired, or is failing multiple components at once, it may be more cost-effective to replace rather than continue servicing. Our technicians provide honest, no-obligation advice on whether a repair or replacement is the right call. Read our related guide on when to repair or replace your appliance.

Book a gas heater service in Sydney

Do not wait for your heater to break down before booking a service. Hero Plumbing’s licensed gas fitters carry out comprehensive gas heater maintenance across all Sydney suburbs. Book your pre-winter service today.