Yeah if that's MDF get it out of there it won't last. This may or may not work for your application but when I built my in wall enclosure out of melamine I cut out a square on the bottom of the hot side and adhered a ceramic tile over the whole using liquid nails. I put the tile upside down so the rough side was face up and the smooth side was face down. I then stuck my heat pad on the bottom side. It works perfectly and holds a constant temp like a champ. The only downside is it may look ugly unless you cover it with substrate. It looks like you have some room underneath to work with so it's something to consider. Just make sure the tile is sealed on the inside so no liquids leak through.
J
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