Push-fit systems · GF iFIT · Project

How do I connect a radiator with a push-fit system?

This is how it works with GF iFIT: you branch off the heating riser with two tee modules – one for the flow, one for the return –, the d16 pipe runs to the radiator (in conduit where it lies in the screed), and there the radiator connection elbow is pushed on, single or double. Without a press tool, without a flame – and therefore without hot work even in an occupied room.

What makes this connection special

With a radiator everything doubles: flow and return each need a branch, a run and a connection – the parts list is therefore calculated separately (factor 2). The iFIT heating water runs in a closed circuit; the composite pipe is oxygen-tight so that no oxygen diffuses into the heating water. If the pipe lies in the screed, it belongs in conduit – that keeps it free to expand and replaceable later.

The steps

Shut down the system and drain the riser – shut off flow and return, let out the remaining water.
Set the branches: cut the riser at the branch points, prepare the pipe ends (for existing pipe: matching transition), push on one tee module each for flow and return.
Lay the runs: cut d16 pipe to length, chamfer and calibrate, adapters up to the stop, elbow modules per change of direction; route in conduit in the screed.
Push on the radiator connection: set the radiator connection elbow (single or double) and connect it to the radiator valve.
Pull-back test, leak test, venting: test and record before closing, refill and vent the system.

Every action in detail: step-by-step installation.

What you need

For flow and return together: two tee modules, two runs of d16 pipe (length plus 10 % reserve, with conduit in the screed), elbow modules per change of direction, the radiator connection, one adapter per push point – and with the first order the tool set (belongs to every first order according to the manufacturer; we include it in the enquiry). The exact list is worked out by the parts-list tool.

The limits of this project

Heating water in a closed circuit up to 70 °C and 10 bar (manufacturer information) – that covers the usual flow temperatures of modern systems. iFIT is not suitable for steam and open systems. The leak test before closing is part of it here too.

When another route is better

If the system runs flow temperatures above 70 °C – an old boiler without control, say – or if risers above d32 are involved, a press or metal system is the right choice; Temponox and the carbon steel systems are built for exactly that. The system finder names the suitable system for medium and temperature.

Parts for this project from stock

Send us the parts list or tell us riser, run and radiator connection – we put together tee modules, pipe, connection elbows and tool set.

Send an inquiry

Your inquiry to Zickwolff

Send us what you have – designation, standard, quantity, date. We will clarify the rest with you.

One item or a question

Send inquiry

Not in stock? We procure it – single items too.

Designation, standard and quantity are enough.

Several items

Send bill of materials

200 items? One parts list is enough – we deliver complete.

Attach it as a file.

Helpful if already known: project and country, date needed, certificates, packaging and language of the packing lists. If anything is missing, we will ask.

It is urgent

Request express

When do you need it? Express delivery, to the site if required.

Tell us by when you need the material – we will tell you what is possible.

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Technical basis: GF iFIT brochure (2022), GF iFIT product range (07/2025), GF practice guide (08/2026) – authorised-dealer material, use approved. Test values as specified by the planner. Information without guarantee – the binding approval remains with the manufacturer.