Baseboard water heat systems are great in the northern climates. The only bad thing is they take up wall space and can interfere with furniture. I have heard of floorboard heating but have never seen it. I hear it works really well.
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There's also water 'radiators', too. They're often inset within the wall. Yeah, different technologies for different applications.
I once stayed in Northern Canada in a condo with water baseboard heating, during a period of 40* below temps at night. Seriously, 40 below! The damn coldest I ever experienced! Too cold to even ski on a ski trip! Too cold to go out really, and many cars wouldn't start anyway unless they had plug-in oil heaters (many did - that should have been hint).
The condo hadn't been used in weeks, and the thermostat was set in the low 50's. I had my doubts when the manager offered me the place, because I stopped short of the slopes specifically due to the extreme cold and was concerned about warmth. He assured me it was fine, and I'll be damned if the place wasn't appreciably warmer within a half hour! By the time we cooked dinner and sat down to eat, the place was warm & toasty. I was sold! I came to appreciate the baseboard's heating the lengths of the exterior walls. During extremely cold weather, it can be difficult to sleep or sit near an exterior wall. Not with baseboard heat!
And yeah, i have a lot of cold climate experience, and am familiar with heated floors. I know and have visited people that have it, and I even stayed over at a friend's place with it. In an apartment, of all things! It seemed pretty good, and the floor was not as warm as I though it would be. I could comfortably walk around barefoot. I could see the draw if you have a thing for wanting your winter floors cozy warm. I did like it. But the idea of having to rip up a floor to do a repair? Not for me!