In our experience any kind of electric radiators (oil filled, or those flat panel wall mounted ones) are pretty useless especially in larger rooms, and comparatively expensive to run. Wood burning or pellet burning stoves seem to be best for keeping a whole house warm, judging by the houses of friends who have them.What's the story with those electric radiators the Spanish have which look like big hot plates?
All electric heater produce the same amount of heat for a given amount of electricity. Do not be taken in by tales of 'better efficiency' and the like.
The best thing to clean woodburner glass with is Mr. Muscle. There are some other makes (don't know the names) which work but most cheap brands are completely useless. With Mr. Muscle it takes a couple of seconds.