[seanflyon]

Any electric heater will be approximately 100% efficient, but electricity is generally much more expensive per unit energy than than natural gas or oil. If you have decided that electricity is your best option, you should compare convenience, installation cost, and whether you want to heat specific areas or the entire house.

[andor436]

However, there's a big difference between electric resistive heating (generating heat) versus electric heat pumps (moving heat around.) The latter can be 3x or more efficient than the former.