I've been told that some open showers feel a bit drafty. I was planning on having a doorless shower installed. The shower is about 42" x 105" long. The back wall is 105" long with a 4' x 4' window at the left end of the back wall. The shower heads will be at the right end wall and was planning on an electric towel warmer on the left end wall as it'll be almost 8' from the shower head. The front wall will have a 36" door on the left side and then about 5 feet of glass wall on the right half of the front wall. Glass will run from curb to ceiling or very close to ceiling.
I'm hoping the glass going almost all the way to the ceiling (7' approx) will keep much of the hot water heat in. My concern mostly surrounds the window in the winter time (here in Canada with temps in the 0 F range on average and sometimes down to - 25F) that will cool the air just inside of it.
I have been looking into options to try to both reduce the potential draftiness and cooling of the air near the window. Option 1, add infloor heating into the shower base. Option 2, upsize the towel warmer so that I can just turn it on when I want to have a shower. That would both get the towels warm in time for their use and may also add a bit of heat to the shower area being that it is at the end of the shower room.
I'd love any help with this, thoughts on either option or alternate options. And no the window is not coming out. It faces south and brings in lots of heat and light in the winter when it is sunny out and great cross flow ventilation in the summer when it is hot. It has just been replaced in the past year with a vinyl awning style window.