I have some from Valentine supply from many years ago...they used to supply them to zoos...they are designed to be buried in dirt etc for natural looking displays,
but I think they stopped making them (long ago) & I'm out of touch with anything Valentine, whether or not they're even still in business? The ones I got from them
(& they still work, they're pretty indestructible) have thick insulated cords into a hard (ceramic?) 8" flat square that's about 1/4" thick. Low wattage but get very hot.
The only things that are similar that I know of are designed for farm use (aka "pig blankets") & dog-breeding (whelping quarters can get wet!) use so they're larger...
but again, designed to be safe with moisture. (as bcr229 suggested also)
I've seen ppl talk about using UTH under wood cabinets...it's very inefficient, & probably unsafe over time. While slate doesn't catch fire, I still don't think
UTH belongs under it...I just wouldn't do that. The RHP sounds like a good solution, other than a UTH that's designed for use with wetness.
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