Fits: Silvia models made from approximately August 2006 and on (V2 and V3). No conversion kit parts are included with this item. If your Silvia was manufactured prior to 2006, you will need a conversion kit. If your Silvia was manufactured during 2006, you may need a conversion kit. A tag with the manufacture date should be present on the base of the unit. If you’re uncertain which boiler you currently have, please see this link.