In their earliest inception heating pads came in the form of a metal (or rubber) water bottle, which was heated, and then placed upon a strained or injured muscle to provide relief. The "hot water bottle," as it came to be known, has been in existence since the early 16th century. In its earliest incarnation, a hot water bottle was sometimes filled with burning coals, which were, in turn, used to warm a bed.
The primary difference between the antiquated water bottles of old and the electrical heating pads of today resides in the versatility, convenience, and impact that today's models offer. The number of settings on an electrical heating pad has gone from zero to infinity. In addition, there are built-in features that keep today's models from overheating. There are also auto-timers that tell the pad when to turn off. Certain non-electrical pads lock in their warmth from a microwave, and these pads are often designed to function as cooling pads, as well.
The electric heating pad has been around since the early 1900S. It was originally introduced as a bed warmer that would sit beneath the fitted sheet, providing warmth and comfort throughout the night. While there are still electrical heating pads that are used for this purpose, most pads are designed for providing relief to injured muscles or aching joints. The concept remains very similar to that of a heated water bottle, sure, but the technology has become such that people can expect a much more concentrated result.
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