Our house is early 1900s and there is an old small radiator inside a kitchen cabinet that has been shut off for years, and I'd finally like to remove it. This is a hot water system. (The whole system is drained currently because I had to temporarily remove another rad.) This photo shows the supply & return pipes in the basement going directly up into the cabinet where the rad is:



I'm pessimistic about being able to unscrew the pipes, and was thinking it might be easier to cut the 2 verticals right below the floor, and cap them somehow. Does this make sense? Given the tight spot, what is the best way for an amateur to do this? Is there a better way?

BTW, I've looked at the rest of the heating pipes in the basement, and as best as I can tell, the pipes are not in "series", so I think no other rads would be affected by this operation.

Thanks in advance!