I second Disneydaz's experience. I bring my travel mug and my fav tea bags (& sugar or honey packets). I never had an issue about getting hot water from the CM's. Last time we went I felt like I was getting a sore throat, so I walked around with hot tea all day. The travel mug I have seals real good so I could put it inside my purse during rides & not worry about dripping.
With asking for a coffee maker to heat water at the hotel, my problem is that my tea always tastes bitter like bad coffee.

I rarely use coffee makers for my tea.
Hope that helps!
Sue