There are 1500W quartz/IR heaters that are about the same size as
a fluorescent fixture. They are supposed to be on a dedicated 15A
120V circuit. (There's also a 3000W version that wants a 15A 220V
circuit - has two tubes instead of one.) They work great for heating
you, or things within their direct radiation area - about 8x12' -
and those things may or may not be effective in radiating some heat
back into the surrounding air.
My experience with a 1500W unit is in an uninsulated garage - it
would knock the chill off, but the lack of insulation and the
lack of a vapor barrier meant that I had to be standing *in*
the beam to feel comfortable. The garage as a whole never
got warm, and condensation and surface rust continued to be a
problem. (We're talking rainy California winters here.)
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