The Shower block is overpowered. It will "fix" radiation and temperature problems. It works even if the base is unpowered. This works: Copper 14 Silicon: 11 Iron: 2 Carbon Substrate: 9 Wood Planks: 1 and it works if you recycle the core out from under it I even saved a blueprint without the core at all. 1 wood plank, 3 carbon substrate. I don't think the shower should work if it's not connected to a powered base.