Worcester boilers from the older 9.24 range through to the 230. 240, 280 and 350. Greenstar combi and the i combi series plus the i junior series. The Highflow range of free standing boilers including the Highflow Greenstar. The std/system category with the CBi, SBi and RD ranges. Minimaxx water heaters. These products are made for use with either lpg or nat gas.