Wattage kind of has to be determined on your own depending on temps in your area and in your home. there is really no way for anyone to say exactly what wattage you need.
::::Well, it depends on the temperature where you live. Some place is colder than other during winter especially in the northern part of US. So, you have to determine by yourself depending on the temp. at your house.
: :Im from WI so it gets colder during the winter but my house stays around the same temperature. Can you tell me what watt wold be good for what cause i can't find any information about it on the web. Thanks