A light smell of gas emanated from our boiler room We called Hart Comfort to investigate as maintenance of our Buderus furnace had been checked during a regular maintenance program about one year ago. Hart Comfort was at our door in less than an hour after our call. The serviceman reviewed the boiler performance and reassured us that everything was functioning in good order. Sometimes, after a cleaning, a burner may emit a small smell of gas. Good cost free service from Hart Comfort. Top dedication to the job by Hart Comfort.