Push-fit systems · GF iFIT
GF iFIT: operating limits
A system is as good as the honesty of its limits. For iFIT, GF names: drinking water, heating and cooling, 10 bar, 70 °C, 50 years of continuous operation – and just as clearly what does not work: compressed air, gas, steam, dimensions above d32. This page lists the limits as manufacturer information with reference – media, temperature and pressure, installation, bending radii, light and frost.
Which medium with which limits
| Medium | iFIT (O-ring) |
|---|---|
| drinking water | suitable 70 °C / 10 bar |
| heating water (closed circuit) | suitable 70 °C / 10 bar |
| cooling water | to be clarified |
| compressed air, oil-free | not suitable |
| natural gas (DVGW G 260) | not suitable |
Heating means a closed circuit – the composite pipe is oxygen-tight. iFIT is not intended for steam, open systems, compressed air and gas. Cooling water is a technical question to be clarified with GF before use.
Temperature, pressure, durability
GF states 10 bar at 70 °C and 50 years of continuous operation for iFIT (PN 10). The system is approved to DVGW W 534 / W 542 – always for pipe and module together; SVGW load values are available for the polybutylene pipe. Short-term fault temperatures are governed by the manufacturer’s documents; whoever runs permanently hotter than 70 °C needs another system – the route then leads to press and metal systems.
What the joint withstands: the burst test
In test videos GF shows what an iFIT joint withstands beyond its operating limits: in the burst test the pressure is raised until the pipe fails – not the push-fit joint; the pull test pulls on the joint until the pipe tears. Such tests are laboratory demonstrations by the manufacturer, not operating values: in service, 10 bar and 70 °C apply. The videos load only after a click; one of them is in Italian.
iFIT Burst tests – GF Piping Systems · Video: GF Piping Systems (YouTube). The video loads only after your click – your browser then connects to YouTube (Google).
Installation: exposed, in plaster, in screed
iFIT is intended for floor-level installation: exposed, in plaster and in screed. Where it will later be inaccessible, the polybutylene pipe belongs in conduit; the composite pipe is dimensionally stable and is laid directly. Before wall or screed is closed there is always the leak test – after that the joint is as maintenance-free as the pipe itself.
Minimum bending radii
Both pipes can be bent by hand – within limits: polybutylene pipe laid exposed 5 × d (d16: 80 mm, d20: 100 mm, d25: 125 mm, d32: 160 mm), in conduit 8 × d; composite pipe by hand or with an external bending spring 5 × d, with a bending tool 3.5 × d. No internal bending spring, and a kinked pipe is replaced, not bent back.
Light, frost, fixing
Daylight: the composite pipe is not intended for permanent UV exposure – outdoors and at windows it must be covered or in conduit. Frost: like any water pipe, a filled iFIT pipe can be damaged by frost – drain garden lines or lay them frost-free (project garden water line). Fixing: we make no statements on fixing distances – here the GF documents are decisive.
Where iFIT ends
d16 to d32, 70 °C, 10 bar, the media of building installation – that is iFIT’s field. For risers of larger dimension, compressed air, gas and industrial applications the press systems are ready; the system finder names the suitable system for medium, pipe and dimension.
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Technical basis: GF iFIT brochures (2022, gfps-39052 12/2023), GF practice guide for installation and repair instructions (08/2026, bending radii pp. 91–92 and annex), GF iFIT product range (07/2025), SVGW load values PB – authorised-dealer material, use approved; DVGW W 534, W 542. Information without guarantee – the binding approval remains with the manufacturer.