How efficient is your boiler? Are you wasting money on high Gas Bills, because your boiler is inefficient? A good quick test to establish whether your boiler is G rated or below is to see if it has a permanent pilot light -if it has then it is very likely to be a G-rated boiler. Any gas fired boiler over fifteen years old is also likely to be G rated and will no doubt be costing you money in excessive bills. So now is the time to start thinking about upgrading or replacing your boiler.