Hot-blast wood furnaces don't use electricity to generate heat, but almost all newer models use electricity for various components. Most are also attached to electric thermostats.
Hot-blast wood furnaces typically use electricity to read thermometers, and some have capacitors to jumpstart operation. Fans are typically powered by motors, which run on electrical power, and newer models often use a powered display to relay operating information. The electrical parts used in hot-blast wood furnaces draw little electricity and don't add much to electrical bills; most are powered by a standard 120-volt outlet. Electrical heating systems, on the other hand, require a significant amount of electricity and require special 240-volt connections.