Can electrofusion fittings be re-heat-fused?

Electrofusion fittings cannot be re-melted.

Electrofusion fittings are specialized accessories that connect pipes using an internal heating wire. Their working principle is that during the initial fusion, the heating wire is energized, causing the fitting and pipe to fuse together at their contact surfaces, forming a permanent connection upon cooling. Once the initial fusion is complete, the heating wire has melted or failed, and the plastic molecular structure undergoes irreversible changes. Forcibly reheating will lead to the following problems:

Loss of connection strength: Reheating will destroy the initially formed molecular chain entanglement, resulting in a weld strength reduction of more than 50% (actual measured data);

Sealing risk: PE material can shrink by 3-5% after repeated heating, easily creating gaps;

Safety hazard: Localized overheating may cause fitting deformation or a short circuit in the heating wire.

Alternative solution: If modification of the connection is required, the original fitting should be cut and a new electrofusion fitting should be used for re-welding. During operation, please note the following:

The cut surface must be flat (tilt ≤ 1°). There must be an overlap of at least 10mm between the new fitting and the old pipe. The voltage must strictly match the fitting's rated value (usually 36-48V).