CPL @1094 (91.6%) on 31-dec-2017 [ "combination central _" "wood burning central _" "gas for central _" "pipes , central _" "form of central _" "oil central _" "hot water central _" "gas fired central _" "boiler central _" "types of central _" "new gas central _" "kinds of central _" "gas central _" "fuel central _" "housing central _" "conditioning , central _" "oil fired central _" "air conditioning , central _" "oil for central _" "pellet central _" "installations , central _" "solid fuel central _" "fire central _" "Oil fired central _" "mains gas central _" ] using heating_boilers