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Speedheater Cobra is the cheapest infra red stripper. It's not really designed for doors but it does the job well enough that it's just boring not boring and painful. It's also not cheap but there should be a healthy second hand market.
Otherwise Metabo make a machine called the LF724s. It's a proper handful, probably the most dangerous tool I own. Has a habit of eating it's own safety guards. Basically an angle grinder with tungsten blades attached to a wheel. It ejects tiny sharp bits of paint at around 1000mph, they are all aimed at your eyes. Anything it touches is reduced to fragments. Everyone who trys it is simultaneously frightened and impressed :)
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Otherwise Metabo make a machine called the LF724s. It's a proper handful, probably the most dangerous tool I own. Has a habit of eating it's own safety guards. Basically an angle grinder with tungsten blades attached to a wheel. It ejects tiny sharp bits of paint at around 1000mph, they are all aimed at your eyes. Anything it touches is reduced to fragments. Everyone who trys it is simultaneously frightened and impressed :)
Videos of this thing look mad, It's just a shame that I'm not sure I have anything which it would be useful for.
For what it's worth, we have a speed heater cobra and have gone through a staircase, and 6 doors so far. Doors have 150 years of pain on them and I can manage to get 99% of the pain off in 4 hours or so.
Cheers.
Our doors are pretty shit and we've recently 'discovered' 4 panel 1950s doors (which would be period with our place). I assume we'd paint, but if they need stripping first I'm not sure it's a job I want to do bearing in mind how tough the OG paint could be.