GAH Heating Products Boilers Boiler Efficiency Rating, Repair & Service Model Type Fuel Efficiency GAH Heating Products 100/150 Option Non-Condensing Oil 81.7% GAH Heating Products 100/150 Select Non-Condensing Oil 81.7% GAH Heating Products 140/190 Select Non-Condensing Oil 82.2% GAH Heating Products 190/240 Select Non-Condensing Oil 80.9% GAH Heating Products 40/60 Option Non-Condensing Oil 81.8% GAH Heating Products 40/60 Select Non-Condensing Oil 81.8% GAH Heating Products 60/80 Select Non-Condensing Oil 81.8% GAH Heating Products 80/95 Option Non-Condensing Oil 80.7% GAH Heating Products 80/95 Select Non-Condensing Oil 80.7% GAH Heating Products Combistream BFC 40/60 Non-Condensing Oil 83.9% GAH Heating Products E40/50 Select Non-Condensing Oil 81.6% GAH Heating Products E50/80 Select Non-Condensing Oil 80.7% GAH Heating Products I40/50 Select Non-Condensing Oil 81.6% GAH Heating Products I50/80 Select Non-Condensing Oil 82.2% GAH Heating Products Thermecon 100/150 Option B/F Non-Condensing Oil 84.1% GAH Heating Products Thermecon 100/150 Option C/F Non-Condensing Oil 84.1% GAH Heating Products Thermecon 100/150 Select B/F Non-Condensing Oil 84.1% GAH Heating Products Thermecon 100/150 Select C/F Non-Condensing Oil 84.1% GAH Heating Products Thermecon 100/150 System B/F Non-Condensing Oil 84.1% GAH Heating Products Thermecon 100/150 System C/F Non-Condensing Oil 84.1% GAH Heating Products Thermecon 140/190 Option B/F Non-Condensing Oil 83.9% GAH Heating Products Thermecon 140/190 Option C/F Non-Condensing Oil 83.9% GAH Heating Products Thermecon 140/190 Select B/F Non-Condensing Oil 83.9% GAH Heating Products Thermecon 140/190 Select C/F Non-Condensing Oil 83.9% GAH Heating Products Thermecon 190/240 Option B/F Non-Condensing Oil 84.4% GAH Heating Products Thermecon 190/240 Option C/F Non-Condensing Oil 84.4% GAH Heating Products Thermecon 190/240 Select B/F Non-Condensing Oil 84.4% GAH Heating Products Thermecon 190/240 Select C/F Non-Condensing Oil 84.4% GAH Heating Products Thermecon 40/50 W/M External Non-Condensing Oil 85.0% GAH Heating Products Thermecon 40/50 W/M Internal B/F Non-Condensing Oil 85.0% GAH Heating Products Thermecon 40/50 W/M Internal C/F Non-Condensing Oil 85.0% GAH Heating Products Thermecon 40/60 Option B/F Non-Condensing Oil 85.6% GAH Heating Products Thermecon 40/60 Option C/F Non-Condensing Oil 85.6% GAH Heating Products Thermecon 40/60 Select B/F Non-Condensing Oil 85.6% GAH Heating Products Thermecon 40/60 Select C/F Non-Condensing Oil 85.6% GAH Heating Products Thermecon 50/80 W/M External Non-Condensing Oil 84.7% GAH Heating Products Thermecon 50/80 W/M Internal B/F Non-Condensing Oil 84.7% GAH Heating Products Thermecon 50/80 W/M Internal C/F Non-Condensing Oil 84.7% GAH Heating Products Thermecon 60/80 Option B/F Non-Condensing Oil 84.4% GAH Heating Products Thermecon 60/80 Option C/F Non-Condensing Oil 84.4% GAH Heating Products Thermecon 60/80 Select B/F Non-Condensing Oil 84.4% GAH Heating Products Thermecon 60/80 Select C/F Non-Condensing Oil 84.4% GAH Heating Products Thermecon 60/80 System B/F Non-Condensing Oil 84.4% GAH Heating Products Thermecon 60/80 System C/F Non-Condensing Oil 84.4% GAH Heating Products Thermecon 80/95 Option B/F Non-Condensing Oil 84.2% GAH Heating Products Thermecon 80/95 Option C/F Non-Condensing Oil 84.2% GAH Heating Products Thermecon 80/95 Select B/F Non-Condensing Oil 84.2% GAH Heating Products Thermecon 80/95 Select C/F Non-Condensing Oil 84.2% GAH Heating Products Thermecon 80/95 System B/F Non-Condensing Oil 84.2% GAH Heating Products Thermecon 80/95 System C/F Non-Condensing Oil 84.2% GAH Heating Products Thermecon 90/120 Option B/F Non-Condensing Oil 83.9% GAH Heating Products Thermecon 90/120 Option C/F Non-Condensing Oil 83.9% GAH Heating Products Thermecon 90/120 Select B/F Non-Condensing Oil 83.9% GAH Heating Products Thermecon 90/120 Select C/F Non-Condensing Oil 83.9% GAH Heating Products Thermecon 90/120 System B/F Non-Condensing Oil 83.9% GAH Heating Products Thermecon 90/120 System C/F Non-Condensing Oil 83.9% Get FREE Boiler Quotes Compare prices today No obligation to buy Visit Boiler Guide to get free quotes from trustworthy heating engineers in your area. Enter postcode Get Quotes