Radiator Connections Explained: Side, Bottom and Centre Options

Connection position is a small line on a specification sheet but a major installation decision. It affects pipe routes, valve choice and how easily a replacement can be fitted.

Side connections

Traditional side connections are familiar to installers and can work well for renovation, especially where existing pipe positions are retained. Confirm thread size, connection centres and whether flow direction matters.

Bottom connections

Bottom connections can create a clean appearance and may simplify concealed pipe runs. Check the exact centre distance and identify the designated flow and return where a valve insert is used.

Centre connections

A central connection pair may make radiator positioning easier because the pipe centreline remains consistent across several widths. The wall build-up and valve projection still need coordination.

Before ordering

• Mark the viewed side used in drawings.
• Confirm wall-to-pipe and pipe-centre dimensions.
• Match valves to the connection and pipe material.
• Allow access for venting, isolation and future servicing.

Never assume that two visually similar radiators have identical tapping positions. Use the current technical drawing for the exact model and size.