Condensing boilers use modern technology to re-use the heat that is currently wasted through your flue, ensuring that all the heat from the fuel goes towards heating your radiators and hot water. It therefore uses less heat from the burner, and as a result is much more economical to run and friendlier to the environment. Condensing boilers are at least 25-30% more efficient that non-condensing boilers. There is very little work involved in replacing your old style boiler
with a new super efficient condensing boiler.