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Essentially, if your bathroom is not excessively cold/damp then you could probably get by with a normal towel rail.
If your bathroom can be cold, however, electric towel rails are really useful in those slightly cool months where your bathroom gets chilly, but before the heating comes on. They're also useful for drying clothes on if you don't have a tumble dryer. Mine is set up on a timer and it's really good for taking the chill off the bathroom first thing in the morning.
With the towel rail most places don't need dual fuel, we use a duel fuel towel rail in a cold damp basement area to boost the central heating effect but the other towel rails we have in the house are central heating rads basically and we don't get problems with towels not drying in the months the central heating isn't on. Essentially, if your bathroom is not excessively cold/damp then you could probably get by with a normal towel rail.