Purchase a heater with a guard around the heating element. A wire grill or other protection is essential to keep fingers or fabrics from touching the hot element. Portable electric heaters that heat by circulating oil or water, however, usually have lower surface temperatures and may not need guards.
Because of market competition, you won’t go wrong most of the time if you go by price as a guide to quality when buying tools. If you’re pondering whether to buy the $100 or $200 tool, go with the more expensive. Quality tools are a joy to work with and, properly adjusted, they will produce superior results. Also, it’s less expensive to buy a quality tool the first time than to replace a lesser tool with a better one later on.