Hydronic heating running costs in Canberra: gas vs heat pump (2026)

In a mild city, the choice of heat source barely moves your annual bill. In Canberra it dominates. With well over 2,000 heating-degree-days a year — more than any other Australian capital — a Canberra home runs its heating hard, for months. Over a 15–20 year system life, the running-cost difference between a gas boiler and a heat pump dwarfs the difference in install price. That's why, for the ACT, we tell clients to judge a hydronic system on lifetime cost, not sticker price. This guide supports our hydronic heating Canberra service with the numbers behind that advice.

Everything comes down to efficiency. A modern condensing gas boiler converts roughly 90% of the gas it burns into useful heat — a "COP" of about 0.9. A hydronic heat pump doesn't burn anything; it moves heat, delivering 3.5–4.5 units of heat for every unit of electricity (COP 3.5–4.5). So to deliver the same warmth, the heat pump uses roughly a quarter of the input energy. Even after accounting for electricity costing more per unit than gas, the heat pump comes out well ahead — and in Canberra, across a long season, that advantage compounds into hundreds of dollars every winter.

Take a well-insulated 200 m² Canberra home with an annual space-heating demand of around 18,000 kWh of delivered heat (a realistic figure for the ACT climate). A gas boiler at ~90% efficiency burns about 20,000 kWh of gas; at 2026 ACT gas rates plus the daily supply charge, that lands in the order of $1,600–$2,000 a year. A heat pump at a seasonal COP of ~3.8 uses about 4,700 kWh of electricity for the same heat; at typical 2026 ACT electricity rates that's roughly $1,100–$1,400 a year on grid power — and materially less with solar. The heat pump roughly halves the running cost, and removes the gas standing charge entirely. These are indicative figures — your home's insulation, thermostat habits and tariff will move them — which is exactly why we model each job individually.

Two things quietly inflate a gas heating bill in Canberra. First, the daily gas supply charge — you pay it every day of the year just to stay connected, even in summer when the heating is off. Going all-electric removes it. Second, gas prices have trended upward while the grid decarbonises, so a gas system exposes you to rising fuel costs over its life. An all-electric heat pump, by contrast, can be paired with solar and benefits as the grid gets cheaper and greener. The Australian Government's energy.gov.au guidance makes the same point: efficient electric heating paired with solar is the lowest-cost way to heat most Australian homes.

Canberra has excellent solar yields, even in winter, and this is where the heat pump's all-electric nature pays off hardest. Run the heat pump during the day on your own solar generation and the marginal cost of that heat approaches zero — something a gas boiler can never do. For homes that heat a thermal mass (like an in-slab underfloor system), you can even "charge" the slab with cheap daytime solar and coast through the evening, further cutting grid draw. Solar turns an already-cheaper heat pump into a dramatically cheaper one.

Canberra is electrifying faster than anywhere in Australia. The ACT is progressively ending new gas connections and steering toward all-electric buildings, and offers support for households moving off gas. That reshapes the decision: investing in a new gas boiler now means committing to a fuel with a shrinking future and rising cost, while an all-electric heat pump is aligned with where the ACT is heading — and keeps its resale and compliance value. For the full climate and policy picture, see our guide to hydronic heating in Canberra and the cold capitals.

The heat source isn't the only lever. The emitter matters too, because a heat pump is most efficient at low flow temperatures. In-slab underfloor runs at 35–45 °C — the heat pump's sweet spot — so it delivers the lowest running cost. Generously sized radiators that run at 45–55 °C are close behind. Under-sized radiators force a higher flow temperature and hurt efficiency, which is one more reason a proper heat-loss calculation pays for itself; our guide to mistakes to avoid covers the sizing pitfalls.

Pulling it together, the recipe for the lowest running cost in Canberra is: a cold-rated heat pump (so efficiency holds through frosts), low flow temperatures (underfloor or generously sized radiators), per-room zoning and scheduling (so you heat what you use), rooftop solar (to slash daytime grid draw), and annual servicing (to keep efficiency high). Follow those five steps and a Canberra home stays warm all winter at a running cost a fraction of the gas system it replaces. For a system designed and quoted to your home, see our hydronic heating Canberra page or the heat pump hydronic heating Canberra system page.