Which is healthier (and why)?
Underfloor heating with an electric mat or underfloor heating with a water pipe (running water – geopathogenic zones)?
Either way, I prefer water.
For me, the only option would be a heating system using water, because we are already exposed to enough smog from electrical systems and appliances.
Why do you always want to abuse air as a heating medium? Underfloor heating is the worst air heating. The healthiest heating for humans is radiant heating. With heating tape along exterior walls, you can forget about insulation.