Sorry for the youtubes, I recommend Ytdlnis to view:
DIY magnetic induction water heater that uses no fuel, but instead uses free energy from sources like wind or water directly to create endless hot water.
Really impressive and simple concept with so few parts!
I think because it’s somewhat novel, and really very simple. Once you start getting into electrical energy, you add layers of complexity. Think like global supply chains are going to get disrupted, and this kind of low tech is absolutely the right direction to be following imo.