fwiw---an example of repairs. Keep in mind that this is basically a Hot Water pipe.
When radiators were all Metal, the top and bottom Brass sections were soldered to the core. You could replace a leaking or clogged core by melting the solder and pulling the rad apart....New core new solder job.
A "lost art", a lost fix-it not replace it----Void Due to Plastic Rads.
Solder---https://www.nuclead.com/PDFs/2012/08/solder_420x280.jpg
So any holes in that metal heater pipe can be sealed with same. You've just got to get the metal around the hole or break clean---as in 'down to the metal'.
This is propane torch temps --- not welding.
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