Hydronic heating installation cost in Melbourne (2026)

Hydronic heating is the gold standard for Melbourne winters: silent, no dust, perfectly even, and increasingly cost-effective when paired with a heat-pump boiler. But it's a meaningful capital investment — and quotes from different installers vary wildly.

Here's exactly what hydronic costs to install in 2026, where the price comes from, and the comparisons that actually matter for your power bill.

The four hydronic system formats

Panel radiators. Most common. Steel panels in each room. Fast to install, easy to retrofit, easy to control room-by-room.

In-slab. Pipes embedded in concrete. Best for new builds. Beautiful, silent, but slow to respond and not retrofittable.

Trench convectors. Recessed under windows or full-height glass. Premium look. Higher cost.

Towel rails (heated). Often added to bathrooms regardless of the main system.

Typical 2026 installation prices

Scope	Typical 2026 price	Notes
Single radiator add-on (existing system)	$1,200 – $2,200	Including pipework
6-radiator retrofit + new gas boiler	$14,500 – $19,500	3-bed home, standard insulation
10-radiator new build + condensing boiler	$22,000 – $30,000	Includes manifolds, TRVs
Full in-slab system (200m² home)	$28,000 – $42,000	New construction only
Heat-pump conversion (existing rads)	$11,500 – $17,500	Replace boiler with R290 unit
Add heated towel rail	$650 – $1,200	Per rail, plumbed-in

Boiler choice — gas vs electric heat pump

A high-efficiency condensing gas boiler is still the cheapest install ($3,500–$5,500). A modern hydronic heat pump (air-to-water, R32 or R290) is $9,500–$15,500 installed, but typically halves running costs and pairs with solar.

If you're future-proofing or already all-electric, the heat pump is usually the right call. If you have cheap gas and an existing service, the boiler still makes sense.

What's included in a good hydronic quote

Heat-loss calculation per room (not just floor area), correctly sized boiler/heat pump, oxygen-barrier PEX or multilayer pipework, proper hydraulic separation, manifold(s) with isolation, individual room thermostats or TRVs, system flush and inhibitor charge, commissioning report, 5-year workmanship warranty.

Running costs you can actually plan around

For a typical 3-bedroom Melbourne home heated 6 hours/day, June–August: gas hydronic costs roughly $480–$680 per winter; heat-pump hydronic costs roughly $260–$420 (less again with solar). Real numbers depend on insulation, glazing and zoning.

### Frequently asked

Q. Can I retrofit hydronic in an existing slab?

In-slab — usually no. Panel radiators — yes, easily. Pipework runs through the roof void or wall cavities.

Q. How long does install take?

A typical 4-radiator retrofit is 3–5 days. A whole-house new build with manifolds is 1–2 weeks.

Q. Can I add radiators later?

Yes — if your boiler/heat pump and manifold are sized for it from day one. Always tell your installer the long-term plan.

CALL TO ACTION

Thinking about hydronic? Book an in-home consult ($245, fully credited toward install) and we'll do the heat-loss calculations and design proposal for free. Call 0411 234 567.