Comment Re:Any suffiently advanced tech... (Score 1) 986
It doesn't even need to be very complex or expensive. No need to use vacuum or anything expensive.
Take about 10 meters of 22mm copper pipe.
Coil it into a suitable coil to go round the device.
Paint the inside black.
Wrap the thing in insulation.
Insulate the pipes, and attach to an insulated 55 gallon drum full of tapwater, with a central heating pump.
It will be very, very obvious in the first couple of hours if it's heating at 900, or 3kW.