What metals are radiators made out of?
That depends what radiator you have in mind. If you mean automotive radiators, then they are made of thin copper sheets shaped into flattened tubes (that flat portion becomes the fins). If you mean household radiator, they used to be made of cast iron. Since water heating is not as popular as it was (most new houses use pulsed air instead of water, or electrical space heater) there are not than many cast iron radiators needed. Underfloor radiator will use plastic piping or in the case of electrical units, electrical cables; while space heater electrical radiator (aor exchange) will have aluminium fins to conduct the heat from the heating element (itself made of nichrome), or be made of PTC ceramics.
