Under Tile Floor Heating Pads for Bathroom Remodel

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2stupid2fixit

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I am about to renovate my 1974 bathroom and dumpster the floor tile tub and everything else in it, install the Delta 400 series tub and backsplash, home depot modest single sink vanity, and a plain jane elongated bowl poop catcher. All of that is standard and I have done it many times.
BUT for this remodel, the existing bathroom has a Federal Pacific convection type wall heater embedded in the wall. I never liked it, and it basically looks like an electric broiler from an oven mounted on the wall. That for certain is going in the dumpster. Here's my question...I see Home Depot, Amazon etc sells these radiant heat floor pads that can be mounted on top of the cement board, covered with mastic and then have tile laid down. They also claim to heat a room of this size efficiently. They even come with thermostats that are Amazon echo and google nest compatible...and best part, they seem to be relatively inexpensive. The bathroom is 5x14. 60 inches by 30 inches of that has the bathtub parked on top of the floor, and The vanity will be about 2.2 square feet on the floor. The floor tile will be marazzi LFT ceramic (? maybe porcelain?) planks.
Can anyone tell me what working with this stuff (Radiant floor heat, brand unimportant) is like?
Are there pitfalls I should know about before installing it?
Does it really work well?
Am I thinking of buying magic jellybeans? Meaning, will I regret this?

There is an open crawl space under the house, and the house is very poorly insulated.

This is what home depot has, and I know I don't need 100 sq feet of it... but just for reference...


Any comments suggestions or feedback is appreciated.
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