While my bathroom isn't the room my wife and I frequent the most, it's never good to be uncomfortable in this area, especially if you have tile floors. That's why we were forced to consider some alternative heating solutions last year around this time when we found that our bathroom wasn't holding in heat very well. (We later found out that this was due to a draft in the room's ventilation fan, but that's another story.)
In the meantime, we were forced to pursue temporary solutions to this larger problem. I was reminded of this scenario by a reader who is experiencing similar issues, and would like to pass on the advice that I gleaned during this difficult time. As such, I want to sing the praises of the Seabreeze SF12ST ThermaFlo Bathroom Electric Heater.
We purchased this small unit off the internet and had it within a couple business days. What I like about this model is that it's conscious of the limited space many people have in their bathrooms. (We tried to put some of our larger space heaters in the bathroom, which was often more of a hassle than it was worth). For example, this heater plugs into an outlet and automatically turns off when temperature changes occur. (This means you aren't spending more money heating the room when taking a hot shower.)
It's also simple to install and features a side outlet. So, if you only have one outlet in your bathroom, you'll still have access to a power supply. (This allowed me to recharge my razor and my wife to blow dry her hair during this ordeal.)
As a result, we still keep the unit around, even though we don't see much use out of it since we invested in larger repair. Once you find something like this product that can work in a pinch, it's something you feel good about hanging on to.