Wrap the flexible fiber heating element around small-diameter pipes and tubes or pack it into tight spaces. Since these heaters supply the same wattage regardless of the surrounding temperature, they're less prone to power surges than self-regulating heaters. All require a temperature switch or controller (sold separately) to regulate heat output. They do not produce an electromagnetic field, so they can be used near electronics.

Note: Only install these heaters in accessible locations; do not install them behind walls, underground, or in other difficult-to-access areas. Use fiberglass tape or heat-transfer putty to install them directly on surfaces that are free of dirt, grease, and rough edges. Do not use electrical tape, duct tape, metal bands, or wire. To prevent heat loss and protect heaters from moisture and corrosion, wrap them with fiberglass insulation.