I don't know how many times in the past I have thought about buying a generator for backup power for my house or business.

I have very little expertise in this subject and I seem to always get bogged down in how big of a generator do I need. I would want to run the hot water heater which is electric along with the furnace, refrigerator and at least a few lights. Either the computer or tv wouldnt be a bad idea as well.

Any help in this subject would be appreciated.