[Amps] How about this furnace?

[Peter Chadwick]

What puzzles me about this size amp in ham use is where you get the AC power from for it. If you ran it at full whack, you'd be needing to peak around 20kW from the mains, or around 100 amps from a single phase on 220volts. (let's not imagine running it from 115!) So you'd probably need 3 phase, which isn't standard domestically..... Running it 'conservative' still means a lot of filament power - 781 watts, according to my Eimac data.
So for emergency comms, you'd need a damn big generator - or battery (sic), while for 'normal' use, you need to be pretty well heeled just to pay the electricity bill.
Antenna requirements at this sort of power level are a problem, too, with flashovers, corona and all sorts of difficulties.
Life may be too short for QRP, but the difficulties of this sort of level of QRO start getting a bit much for an amateur installation.
73
Peter G3RZP