To second hrjet, think of it this way: electricity has to be produced from another source of primary energy, the efficiency of which is very much less than one.

To second hrjet, think of it this way: electricity has to be produced from another source of primary energy, the efficiency of which is very much less than one. So even if electricity can be converted into heat 100% efficiently you are still better off producing heat from the primary source directly, ignoring the cost of distribution. In general the price you pay should reflect the utility of the resource consumed.