We use a steam plasma tube, linked via a fan to a thermoelectric generator. A 50x1cm steam plasma tube at 4 atmospheres produces 2.4MW of heat. That a 2kW fan will turn into 144kW of power.
We do get a serious blast of hot air from the roof. To avoid this, we use a 25x1cm steam plasma tube in a water bath. We blast steam over the thermoelectric generator, then through a heat pump.
This returns 85% of the heat to the boiler so we will still get 130kW of current, but we take out above 2kW to drive the Carnot system.
A super car only needs 28kW of power! So even allowing for efficiency loses, we can still fly the car between cities.
Off 8x10-15cc of regular water a year: OK – we had trouble measuring it, in 2001 at Sheffield University. Department of engineering materials. My PhD got ended, as it was realised I had cured climate change – 3 years before the idea was devised. The world climate started cooling 1995.