Using Alde heating at storage yard

We have no access to electric at storage yard. We are due to go away (again) a week today and will be at storage yard next Saturday. Also no water inlet at storage yard. Is there a way we can put the Alde heating on for about an hour by using the gas to warm things through? We have a roof fitted solar panel. If we can….what is best way? We have Swift Command system…have checked handbook and Alde book and nothing in plain English. Any advice welcome…many thanks