...they are outside. In pieces.
It turns out that they are put together using individual sections. Two pieces of pipe are used to connect one section to the next. Four threaded rods run the length of a radiator, and by tightening nuts on the ends of rods, the sections are pressed together. Years of hot water causes them to rust in to one, massive, impossible to move assembly.
Turns out that, once you have removed the rods, the sections are relatively easy to bust apart. If you own a splitting maul. Which I do. You don't try to cut the sections apart, rather you use the wedge to pop the sections apart.
Here's what I started with:
|You can see the hex heads of two of the four rods right under the break.|
Multiply by four, and you get:
|Bedroom radiator and the Chosen Destructor|
|Pile the first...|
|...and pile the second.|