On this page you will find our range of Calor Gas Bottles/Cylinders. There are 3 different colours of gas cylinder with 3 different regulator connections. Generally if you require gas for a heater then you would choose the blue butane cylinder available in 4.5kg, 7kg or 15kg sizes with a push on regulator. If it's gas for cooking then it's the red propane cylinders available in 3.9kg, 6kg, 13kg, 19kg and 47kg with a screw on regulator. If it's gas for a barbecue then it's the green propane cylinders available in 5kg or 13kg sizes, also with a push on regulator but different to the butane regulator.