Why Your Gas Boiler's Days Are Numbered, and What to Do About It

If your gas boiler is still running fine, replacing it probably feels like a solution to a problem you don't have. But the case for acting now, rather than waiting for it to fail, is stronger than most people realise.

Gas prices have one direction to travel

Australian residential gas prices have risen over 40% in the past five years. That isn't a blip, it's a structural shift driven by export market linkages, ageing network infrastructure, and declining domestic supply. There is no credible scenario in which residential gas gets meaningfully cheaper. Every year you stay on gas is another year locked into that trajectory.

Then there's the network charge, the fixed cost you pay simply to stay connected to the gas network, regardless of how much gas you use. As more households electrify and gas demand falls, those fixed costs get spread across fewer customers. Network charges are already rising and will keep rising as the network slowly winds down.

The sun tax is coming

Feed-in tariffs, what your retailer pays you for exporting solar, have collapsed: from tens of cents per kWh a decade ago to a few cents today in many states. Some networks are now proposing negative export tariffs, charging you to export during periods of oversupply.

If you have solar and you're still on gas, you're in the worst of both worlds: exporting your cheapest energy for almost nothing, while buying expensive gas to heat your home.

Waiting for the boiler to fail is the expensive strategy

When a gas boiler fails, it usually fails in winter, at the worst possible time, leaving you with no heating and a rushed decision. Emergency replacements mean less time to research, less ability to compare quotes, and no chance to plan around installer availability.

In Victoria, you may also find yourself replacing one gas appliance with another shortly before gas connections are restricted further, a decision you will then live with for another fifteen years.

Replacing a working boiler on your own timeline, with proper planning, lets you choose your installer and get the system commissioned properly before you need it.

What to do about it

The transition path is simpler than most people expect. A hydronic heat pump system connects directly to your existing pipework: no new radiators, no replumbing, no structural work.

The question isn't whether to make the switch, it's when. And the answer, increasingly, is before your boiler makes the decision for you.