THINK I FOUND THE CULPRIT... injection molding is the answer

on the bottom of each tub is a round 1cm protruding bump where the tubs were obviously connected at the bottoms during manufacturing while the plastic was being poured into the mold units. Now only does that rim make a slight indentation into the UTH, the center of the ring on each end of the tubs has a little plastic nub, just leftover from cast or injection mold of the tub manufacturing.

Whereever it leaves these indentations, it appears theres slight melted UTH, not very big, but you can tell the wires there burnt out and melted them.

Filing this down and smoothing it out would likely help the issue, but it still seems to cause the bottom of the tank to bow and warp while its on... the plastic really softens up.

If you were to stick you hand under the tub, which is sitting on 1/2' feet, the bottom part towards the center of the UTH sags down and touches the cermaic tiles i have placed underneath it. It's also extremely hot to the touch.


Im wondering if its cooking itself at the sametime from being wedge between the plastic and the ceramic.

If I raise the tub up more, the UTH just causes the plastic to sag more... It's not melting the tub, but it sure warps it.

Now with the 15w gone, should i remove the 24w from the bottom, and just let them rest on the ceramic, since it should it up anyway? That cermaic is hot to the touch, almost burning hot.... but if you touch the bottom of the inside of the tub, is warm, but nowhere near as hot as the outside.