When buying our tile from the tile story the salesman mentioned that he doesn't recommend epoxy grout because if the tile gets hot (it will be in a shower) the tile might expand want to expand and the epoxy grout won't give as much as regular grout will, causing the tile to crack.
1) I'm not sure if he's fibbing since his store didn't sell epoxy grout and he wants to sell us his grout
2) I'm not sure if there is any truth otherwise to the claim, while I guess I can understand the concept in practice it seems a bit far fetched
3) we're using it for accent in our soap recesses (picture below) so it won't even get the hot water on it except through minor splashes, so I have a hard time believing they will get "hot" enough for it to be a problem, if there could be a problem.
Looking for someone to shed light on the situation and either point out that it is a huge problem and I'm just underestimating it or that it's crazy talk and not to worry about it
1) I'm not sure if he's fibbing since his store didn't sell epoxy grout and he wants to sell us his grout
2) I'm not sure if there is any truth otherwise to the claim, while I guess I can understand the concept in practice it seems a bit far fetched
3) we're using it for accent in our soap recesses (picture below) so it won't even get the hot water on it except through minor splashes, so I have a hard time believing they will get "hot" enough for it to be a problem, if there could be a problem.

Looking for someone to shed light on the situation and either point out that it is a huge problem and I'm just underestimating it or that it's crazy talk and not to worry about it