Liquified gasses do not need to be kept cold if they are kept under pressure. They are cold if you release them but are not cold in the tank. Example: put your hand on the side of a tank of propane. We used to use propane or butane, depending on the time of year, in our house years ago. Most rural homes and farms still use butane/propane. Many farmers in this area used to run their trucks on propane but have switched now that Diesel is so common.

Another beauty of propane is that you can you run your oil almost without changing it. There is no carbon or acid build up.