There are a few types of towel heaters. The most common amongst them are the electrical heater and the hydronic towel warmers. The electrical heaters have a plug through which electricity is allowed to flow. As soon as the device is switched on, the heater becomes warm and starts heating up the towel or dress. Now days, there are several types of heaters available in the markets. They differ in shape, size, color and even the material it is made up of. The material ranges from bronze, silver to brass and a few more. The electrical heater is usually more preferable than the hydronic heater.http://www.towelwarmeroutlet.com/hatowa.html http://amplify.com/u/a17r0q