The heaters are black pads that should be stuck on the bottom of the tanks. Notice I said should as most of the time they are peeling off. But they have thermistors in them so that they will shut off if the temps go above a set point. I had the pads and switches on mine but they never worked until I traced the wires and found that they never connected the wires to the switches behind the control panel. I thought they had forgotten to run them because I could not find them anywhere. Finally with and inspection mirror and flashlight I found them coiled up in a void next to the panel. After help from the good people here as to what colour went were I got them connected and they started working. One more project complete on my new DIY RV kit.
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