40 to 55C is good for underfloor heating. Which in most cases unfortunately is way too costly to install, in an existing structure as you'd need to rip out all

40 to 55C is good for underfloor heating. Which in most cases unfortunately is way too costly to install, in an existing structure as you'd need to rip out all your floors and the ground beneath it, to allow for 8 cm of tubing in a cement structure.