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The problem with pumping is low energy density, especiall when compared to deating water. Heating 1 kg of water by 1°C requires 4186 joules of energy. So to store the same energy by “lifting” water, it would require 4186 j / (1 kg * 9.81 m/s^2) = 426 m of height difference. This value seems unbelievable, but I have triple checked it. And that is only 1 degree of difference, 50 degrees difference would equal 27 km of height difference.
Yeah, the secret is to debloat it all the way to 7. Going under that is not advisable expect under doctors supervision.