A condensing boiler is a special structure that gives bigger effectiveness compared to customary gas boilers. While, the effectiveness of regular domestic boilers could be almost 75 %, with a condensing boiler it should attain more than 87 %. This is very important as energy rates are tending to be high and probably will get more highly priced. This high efficiency is through extraction of the spent heat within the exhaust gases. In different words, they cut your quantity of gas being used by reusing the waste gases retaining the warmth in your residence rather than permitting it to run off outdoors. In a combination heating boiler, the gases depart at a cooler temperature of almost about fifty-five degrees Celcius. In a standard heating boiler, your spent flue gas conducts away a lot of heated energy at a hundred and eighty degrees.