I try to detail the info so people can check...
The bungalow ran on LPG bottled gas for 3 years heating and hot water so I know what was used: I have used the worst 2 years:
I am using the conversion rate of one kg of LPG gas giving about 14.091kW hours
In 2 years we used about 13277kW of LPG energy for heating and hot water. ( about 10 bottles of 47kg ) If we deduct a modest 2kW for hot water each day ( total 1460kW) that leaves about 11,817 for the 2 years.