This is 100% accurate. The only other issue to consider is thermal mass. Tile laid over backer board on top of warmboard (aluminum/plywood subfloor) has a low thermal mass but fast thermal response. Tile laid over gypcrete or concrete is the opposite but is much more consistently “warm” to the barefoot.
catawampus00 t1_j1619gm wrote
Reply to comment by wotoan in Underfloor heating - can you warm up the floor only? by FatFart777
This is 100% accurate. The only other issue to consider is thermal mass. Tile laid over backer board on top of warmboard (aluminum/plywood subfloor) has a low thermal mass but fast thermal response. Tile laid over gypcrete or concrete is the opposite but is much more consistently “warm” to the barefoot.