When complex working environments mean that copper alloys on their own cannot provide a heat exchange solution it may be possible to use a bimetallic tubing. Combined tubes can be produced with copper alloy, aluminium, titanium, carbon or stainless steel combinations. Bimetallic tubing gives combined properties of heat exchange, strength and corrosion resistance that single tubes cannot provide.

Ferrules can be fitted to ensure the "wetted" ends are all of one material type.