A comment
In the bathroom I made a water-heated floor, tired of walking on a cold tile. Installation was carried out independently, I did everything for the first time, so it was a bit heavy, but nothing good on the forums you can find a lot of useful information on the installation. He mounted it from polypropylene pipes, previously soldered them together by bends, every 10 cm. He placed 3 taps on the wall, the first serves to block the heating, and the rest are needed to start the water-heated floor.
From above, the whole thing was flooded with a screed and laid tiles. Heats the floor well, I even thought it would work worse. Satisfied completely, with regard to profitability, I can tell you with confidence that living with water-heated floors is much cheaper than for example with electric ones. I am satisfied, all my expectations have been met, I live with the floors, the second year and there are no problems with them.
pros
Profitable and efficient floors