So, if you like to play with fire and want to do so in a safe manner then a wood stove or a fireplace with glass doors etc. will do fine. But if you are looking for an appliance that actually produces heat, then gas is the way to go.

See also Q&A #12: Heating and Cooling, Q&A #15: Insulation and Energy, Q&A #8: Electrical Systems, Topics: Heating Your Home