Can underfloor heating be installed under the wooden floor ?

Under-floor hydronic or steam heat can certainly be installed underneath wooden floors. I have personally installed one instance of hydronic (hot water) heat system under wooden flooring, and have demolished several buildings with steam heat under wood (and one with hydronic).
I’m sorry that I can’t speak to the health issues involved with heated floors with any authority.
However, I find that my feet are the biggest radiators in my body, and are therefore the first to get cold. I’ve never lived in a house with floor heat, but I have visited such places on many occasions and found them very comfortable.

My relatives installed underfloor heating under wood floors. They seem happy with it. My grandparents had a cement slab and tiles, which wasn’t as nice.

As to health—have you considered using room humidifiers? We have forced air heat and we have a whole house humidifier which makes an enormous difference.

I have it under my wood floor but I have a concrete foundation and the floor is glued down. I think I remember when we bought it that it was ok to put down under wood even with a wood sub floor.
We also have it under the tile in the bathroom, and I can tell you that it’s a lot warmer under the tile than the wood.

it may be ok to use hot water radiant heating on wooden floor but you will not get the same efficiency as those installed under concrete/tiles. If you want to have warm wooden floors, consider Warmboard

I have it on all my first floor rooms and my upstairs bathroom. It is wonderful! and quite standard here in Norway.

I believe that’s quite common actually.

And, BTW, I wouldn’t recommend embedding it in a concrete slab. I once owned a house on a slab. Never again! Concrete slabs are huge heat sinks. Most of your heat will be sucked away rather than radiated up through the floor into your room.

@HungryGuy ; You would be hard pressed to find any house in my town that’s NOT on a slab. I think it’s the standard in California, unless your in the hill country.

@Judi – Okay then. You live in a mild climate where it probably isn’t an issue. You just need a little extra heat for those occasional chilly evenings, right?

@HungryGuy ; winter gets into the 40’s and fifties sometimes. We have fog that lasts for weeks. (Although it has been les since global warming.) We even had snow about 10+ years ago.