All small butane and propane cylinders up to 13.15 Kg can be returned 1 for 1 without incurring a further Calor cylinder service charge except for Patio Gas cylinders. If you do not have an empty patio gas cylinder you will need to buy a service charge. Large cylinders (19 – 47 Kg) can be similarly returned. If you wish to return a small cylinder for a large one there is an additional cylinder service charge.