--- title: "Hydronic Underfloor Heating in Melbourne: Ultimate Comfort & Efficiency" date: 2025-02-11T17:51:00+11:00 author: Geoff Pennington canonical_url: "https://sogeo.com.au/hydronic-heating-cooling/hydronic-underfloor-heating-comfort-efficiency" section: Pages --- ![Hydronic In-screed Underfloor Heating System in Melbourne]() # Hydronic Underfloor Heating in Melbourne: Ultimate Comfort & Efficiency Hydronic underfloor heating provides even, energy-efficient warmth by circulating warm water through pipes installed beneath the floor. It’s ideal for those looking for consistent comfort, energy savings, and a clean aesthetic with no visible heat emitters. SóGeo designs and installs hydronic underfloor heating across Melbourne. Radiant warmth, even from floor to ceiling, that integrates cleanly with a hydronic heat pump for the lowest running cost on the market. ## How hydronic underfloor heating works Hydronic underfloor heating circulates warm water through a network of pipes installed beneath the floor finish. The water is heated by a central appliance, ideally a [hydronic heat pump](https://sogeo.com.au/air-source-heat-pumps), and pumped through the pipework at a low flow temperature. The entire floor becomes the heat emitter. The warmth radiates upward evenly, eliminating cold spots, removing the need for visible radiators, and producing the most stable room temperature of any heating method available. Because the heating surface is the entire floor rather than a small wall panel, the system operates at much lower water temperatures than legacy gas-boiler systems. That is exactly the operating range a modern hydronic heat pump is designed for. The pairing is the most energy-efficient way to heat a home or commercial space. ## SóGeo varies pipe spacing to match each room’s heat loss The heat output of an underfloor system depends on pipe spacing, flow temperature, and floor build-up. SóGeo varies the pipe spacing across the floor plan to match the heat loss of each specific room. Rooms with more external wall area or larger windows receive tighter pipe spacing for higher output. Rooms with low heat loss use wider spacing. This approach delivers consistent comfort across the home while keeping running cost minimal. We also cap the total pipe length at 100 metres per circuit to maintain even flow and pressure across the loop. Larger spaces are split into multiple circuits feeding a central manifold, with each circuit independently balanced during commissioning. ## Five hydronic underfloor heating system types SóGeo specifies and installs the right underfloor heating system for each project. The five most common installation methods, in order of how often we use them, are below. ### In-slab heating Pipework is laid directly into the structural concrete slab during the slab pour. The slab itself becomes the heat emitter, with thermal mass that maintains room temperature for hours after the system cycles off. In-slab heating is the most thermally efficient option and the most common SóGeo specification for new builds with concrete floors. ### In-screed heating Pipework is laid on a positioning board on top of a pre-poured slab, then covered with a 50 to 75 millimetre screed layer. In-screed responds faster than in-slab because the heated mass is smaller. It works well for renovations where the existing slab cannot be modified, and for projects where rapid temperature response is preferred over deep thermal mass. ### Suspended floor heating For homes with timber-joist floors rather than concrete, SóGeo installs underfloor pipework between the joists with aluminium heat-transfer plates. The plates spread the heat evenly across the underside of the floor finish above. This method allows hydronic underfloor heating to be retrofitted into existing weatherboard, period, and double-storey timber homes without disturbing the upstairs floor. ### Minitec low-profile system Minitec is a 15 millimetre dry-install system designed for retrofit projects where floor height must be preserved. The system installs on top of an existing floor without removing the substrate, then accepts the new floor finish directly on top. This is the option for renovations where adding screed thickness would create step issues with door openings or adjoining rooms. ### Siccus FX dry-install Siccus FX uses pre-grooved insulation panels with pipework clipped into the channels. No screed pour is required. The floor finish installs directly on top of the panels. This system suits projects where the slab work must be minimised, where wet trades are not available, or where construction timelines are tight. ## Hydronic underfloor heating works best with a heat pump Underfloor heating runs at flow temperatures of 35 to 45°C, which is much lower than a legacy gas boiler system. That low temperature is exactly where a hydronic heat pump achieves its highest coefficient of performance. A SóGeo install pairs an underfloor system with an air-source or [ground source heat pump](https://sogeo.com.au/ground-source-heat-pumps) to deliver the lowest running cost available for residential heating in Melbourne. For projects replacing a failing gas boiler with electric heat pump technology, underfloor heating is often the perfect target. The retrofit can include a swap from gas to heat pump as a single integrated project. See our [boiler to hydronic heat pump replacement page](https://sogeo.com.au/replace-gas-boiler-hydronic-heat-pump) for the technical detail on the swap process and what stays versus what is replaced. ## When hydronic underfloor heating is the right choice Hydronic underfloor heating is the right choice in three Melbourne home scenarios. The first is a new build or major renovation where slab work is already on the program. Specifying in-slab or in-screed heating during construction adds modest cost relative to the floor work itself, and locks in two decades of low-running-cost comfort. This is the gold standard for hydronic heating. The second is a retrofit on an existing timber-joist home. Suspended floor heating with aluminium transfer plates makes underfloor possible without disturbing the floor finish above. SóGeo regularly installs this configuration in Melbourne’s period homes from the 1900s and 1920s. The third is a partial retrofit on an existing slab home, using the Minitec or Siccus FX dry-install systems to add hydronic underfloor without the cost and disruption of demolishing and re-pouring the slab. For homes that need a mix of underfloor in the main living areas and radiator heating in bedrooms or bathrooms, SóGeo combines both in a single hydronic system. See our page on [hydronic panel radiators](https://sogeo.com.au/hydronic-heating-cooling/hydronic-radiators-stylish-energy-efficient-heating-for-your-home) for the other side of that conversation. ## Get a hydronic underfloor heating quote from SóGeo SóGeo is a Melbourne hydronic specialist. Director Darren Burch has been installing hydronic systems for over twenty years, drawing on three generations of hydronic experience from Ireland. Every underfloor install starts with a site visit and a heat-loss calculation room by room. We specify the right system type for the build, size the pipework against the heat loss, and write a fixed quote against the design. For the full overview of SóGeo’s hydronic heating and cooling service in Melbourne, see our pillar page on [hydronic heating Melbourne](https://sogeo.com.au/hydronic-heating-cooling). For installation pricing detail, see our [cost guide for switching from gas to hydronic heat pumps](https://sogeo.com.au/blog/how-much-does-it-cost-to-switch-from-gas-to-hydronic-heat-pumps). Or [contact SóGeo](https://sogeo.com.au/contact-us) directly for a site visit and fixed quote on hydronic underfloor heating for your home. ![Hydronic In-screed Heating Installation]() ## Our Partners [ ![Reece](https://sogeo.com.au/uploads/suppliers/_AUTOx96_crop_center-center_none_ns/Reece.png) ](https://www.reece.com.au/) [ ![Stiebel Eltron](https://sogeo.com.au/uploads/suppliers/_AUTOx96_crop_center-center_none_ns/Stiebel-Eltron.png) ](https://www.stiebel-eltron.com.au/) [ ![Mitsubishi](https://sogeo.com.au/uploads/suppliers/_AUTOx96_crop_center-center_none_ns/Mitsubishi.png) ](https://www.mitsubishielectric.com.au/) [ ![Purmo](https://sogeo.com.au/uploads/suppliers/_AUTOx96_crop_center-center_none_ns/Purmo.png) ](https://www.purmo.com/au) [ ![Viessmann](https://sogeo.com.au/uploads/suppliers/_AUTOx96_crop_center-center_none_ns/viessmann_wordmark_rgb_1_vitorange.png) ](https://www.viessmann.com.au/)