Dear, sweet jesus...you wanna talk flash vapourization... Lightning's an example of plasma, and its temp clocks in at roughly 15,000 Kelvin. For comparison, the hottest average magma is 1,573.15 Kelvin, and that's enough to instantly incinerate people. A plasma boiler would require some incredible tech, along with extreme durability...we're talking GregTech late-game, on that one. Certainly not impossible, but the resources required would be quite prohibitive at any other stage.
[Yes, I am doing the research, lol.]