I recently noticed a dripping leak on the jacket of my EKO 40, under the green casing and insulation. I took the insulation off and found the leak on a welding seam, but that's not what I'm concerned about now. The boiler itself has curve in it. (pictures attached). The level I used is just about touching the boiler in the middle, but on the end has quite a bit of space, as you can see. There is quite the change between one side of the water stain and the other. Is this normal, or is this boiler wall too weak? Anyone who's had their insulation off let me know.