The diameter of a radiator pipe varies depending on its location within the central heating system.
Here's a breakdown of common radiator pipe sizes:
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Radiator Circuits: Most modern wet central heating systems use 15mm copper pipe for the circuits that directly connect to the radiators.
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Main Supply Pipes: The pipes connecting the boiler, pump, and points where the circuits split typically have larger diameters of 22mm or 28mm. This allows for increased water flow to supply multiple radiators efficiently.
Therefore, the diameter depends on whether you are asking about the pipes connected directly to the radiator (typically 15mm) or the main supply pipes (typically 22mm or 28mm).
