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Cherished Traditional Duchess Heated Towel Rail 6 510mm (H) x 945mm (W)
For maximum warmth remember layers, layers, layers. Because toweling is made of loose fibers, a single layer will mean that the heat simply passes through the towel. This is great when you just want your towels to dry quickly as the heat takes the moisture with it. But in winter when you want towels the warmest this isn't going to give you much satisfaction.
Try experimenting with how many layers you fold your towel into.
Also remember that the very outer layer of towel may be quite cold - this is
because there's cold air circulating around the bathroom, which basically takes
the heat with it as it moves past your towel. If this is the case (or you have a
particularly drafty or air conditioned bathroom) try placing an additional towel
on top of the towel you want warmest. This will have an insulating effect and
the towels beneath will be toasty and warm.