In-slab and in-screed hydronic underfloor heating for Melbourne new builds and renovations, driven by a heat pump or gas boiler. Designed and installed from our Laverton North showroom for the city's ~1,500 heating-degree-day winters.
Hydronic underfloor heating in Melbourne typically costs $35,000–$60,000 installed for a 200 m² home with in-slab pipework and a heat pump, slightly more than Sydney because colder winters demand larger plant and better insulation. Warm water at 35–45 °C turns the whole floor into a silent, even radiator suited to Melbourne's roughly 1,500 heating-degree-days. AHHAC designs every system from a room-by-room heat-loss calculation and installs from our Laverton North showroom.
Reviewed by the AHHAC Technical Team — licensed plumbers & hydronic engineers, NSW Lic 262528C.How we write & review
ImmergasSimeThermaSkirt™Melbourne's long, cold winters (roughly 1,500 heating-degree-days, a −1 °C design temperature) make it the strongest hydronic market in Australia — and hydronic underfloor heating is the gold-standard emitter for the climate. Warm water circulates through PEX-A pipework beneath your floor, radiating gentle, even heat from the ground up with no visible plant, no noise and no air movement. AHHAC designs and installs in-slab and in-screed underfloor systems across Greater Melbourne from our Laverton North showroom.
The efficiency win comes from the low flow temperature. Underfloor runs at just 35–45 °C, which is exactly where a heat pump hydronic heating system is most efficient — so pairing Melbourne underfloor with a Maxa or Immergas heat pump delivers the lowest running cost of any heating system for a well-insulated home. For the full emitter detail, see our hydronic underfloor heating page.
For new builds, in-slab is the default — PEX-A is laid within the concrete slab before the pour, giving a large thermal mass that holds warmth through Melbourne's frosty mornings. For renovations and second storeys we use in-screed: a 30–35mm self-levelling screed over the existing subfloor, faster to respond and compatible with engineered timber, tile, stone and most carpets. AHHAC runs a heat-loss calculation on every Melbourne job so the system is sized for the actual building, not a rule of thumb.
Two Melbourne homes can share the same floor area, the same heat pump and the same price tag, yet one feels beautifully even while the other has a cold corner by the sliding doors all winter. The difference is almost always in design decisions made before the slab is poured. These are the decisions that matter most for hydronic underfloor heating in Melbourne, and the ones we spend most time on with owners and builders.
The heat source is the other half of the picture. With Victoria requiring new homes to be all-electric from 1 January 2027, the natural partner for a new-build floor is an all-electric heat pump hydronic system in Melbourne, which runs at its most efficient at underfloor's low flow temperatures. Our Melbourne new-build case study shows how a Maxa i-290 and in-slab loops performed through a real Melbourne winter, and the underfloor heating cost guide breaks down where the budget goes.
Written from on-site experience by the AHHAC Technical Team.
AHHAC's in-house design and service team — licensed plumbers and hydronic engineers (Lic 262528C) who have designed and installed 2,400+ hydronic heating, cooling and hot water systems across Australia since 1998.
We design hydronic underfloor heating from a room-by-room heat-loss calculation, install it with our own licensed plumbers to AS/NZS 3500 (plumbing) and AS/NZS 5601 (gas), commission and document it, and service it for the life of the system. Nothing is subcontracted out.
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"We've worked with AHHAC for 17 years now. They've installed and serviced our hot water plant across three commercial buildings. They pick up the phone on weekends — that's why we keep coming back."
"We commissioned AHHAC after another contractor abandoned the job halfway. They took over the design, fixed the existing issues, finished the install and gave us a five-year warranty. They saved the project."
"AHHAC delivered our 22-zone underfloor system on time, on budget and to spec. The crew were tidy, the documentation was thorough, and the commissioning was textbook. Couldn't ask for more from a trade partner."