Ive ordered a combi cylinder from Williams today for delivery on Tuesday, however ive realised the one ive ordered is direct. The combi cylinder I need is a 210 litre cylinder with two immersion holes and a coil through which the cold water passes and is heated by the water contained in the cylinder. Is this classed as indirect, I thought that in an indirect cylinder the coil was another means of heating the water in the cylinder. whatever its going to be wrong. hopefully I can speak to them tomorrow.