Hydronic Heating Leak Repair Melbourne

Yes. We use pressure testing combined with thermal imaging and moisture detection to map the exact location of concealed slab leaks before any concrete is disturbed. This allows us to plan the most minimal and precise access point for the repair — or in some cases, to reroute a short section of pipe above the slab to avoid slab work entirely. We discuss options with you before any work proceeds.

Radiator joint leaks are most commonly caused by age-related corrosion of the radiator valve tail or adapter fitting, overtightened or cross-threaded connections from a previous service, thermoplastic valve body cracking in older systems, or repeated system pressure cycling causing connection fatigue. We assess the extent of corrosion to determine whether a fitting replacement or a radiator section replacement is the more cost-effective repair.

Yes. A pressure relief valve that discharges regularly is indicating that system pressure is repeatedly exceeding the safe limit. This is almost always caused by a failed expansion vessel — the vessel's internal membrane collapses and the system loses its ability to absorb thermal expansion pressure. Left unaddressed, repeated PRV discharge can damage the valve seat causing it to leak continuously, and excessive system pressure puts stress on all pipe joints, valves, and the boiler. We replace the expansion vessel and test system pressure properly.

Accessible joint, pipe, and visible radiator leaks are typically completed in 2 to 3 hours including system refill and pressure test. Boiler connection leaks take 2 to 4 hours depending on access and part availability. Concealed slab leaks require additional time for leak location — typically a full day including access, repair, concrete reinstatement, and testing. We provide a time estimate before any work begins.

We strongly advise against using chemical leak sealants in hydronic heating systems. These products can block zone valves, pump impellers, heat exchanger passages, expansion vessel connections, and narrow radiator sections. The resulting blockages often cause significantly more damage than the original leak. All hydronic leaks should be repaired physically — joint resealing, fitting replacement, or pipe section replacement — not chemically sealed.

A visible leak produces water discharge at a specific point — a pipe joint, radiator bleed valve, PRV, or boiler connection. An internal leak (or concealed leak) may not produce visible water but will cause ongoing pressure loss. Internal leaks in underfloor slab systems, concealed pipe runs in walls, or within the boiler heat exchanger are diagnosed by pressure drop testing across isolated system sections.

Not in most cases. We isolate the affected radiator or circuit using thermostatic valves and lockshield valves before carrying out the repair. For radiator connection leaks, we can typically isolate and repair a single radiator without draining the full system. Where a pipe run needs to be fully isolated, we use point isolation to minimise the drained volume.

We cover all Melbourne suburbs for hydronic leak detection and repair, including inner-city areas, and all northern, eastern, southeastern, southern, and western Melbourne suburbs. Slab leak investigations in properties with underfloor hydronic systems are covered across the full Melbourne metro area.

A correctly carried out repair should have no negative impact on the rest of the system. After all repair work is completed, we refill, bleed, and pressure test the entire system to confirm normal operating pressure, check all zones for correct heat distribution, and verify that the boiler is not showing any fault codes before we leave the property.