Do Not buy one powered by gasoline. I bought a gas powered generator & wish I hadn't.This fuel has to be rotated and/or treated for long storage. It is an extreme fire hazard if spilled, and is generally a pain to handle. I strongly recommend either diesel or propane. Diesel is less of a fire problem & can be burned as fuel if you have an oilburner for heat. One supply can do double duty. Diesel fuel doesn't evaporate as fast as gas, so it is less of a storage pain & much less of a fire hazard. Propane is probably the best for ease of handling. The fuel tanks are fill & forget. This option does away with the problem of refilling, pouring & spilling. If you buy two tanks (or more) you can refuel the generator by just replacing the mt tank with a full one.You can position the tanks away from the generator for safety as you don't have to rely on gravity to move the fuel from the tank to the generator. You can go the expensive route with the automatic transfer switch & giant propane tank if you can afford it.

Just be sure that you check the engine oil level periodically.