My water heater, about a year old, was making an almost explosion kind of sound when ever the burner got ignited. I called the FAST water heater co as they were the one who had installed it. Rex showed up promptly on schedule, and explained that this is a common problem and he will take care of it. Within half an hour he fixed the problem to my complete satisfaction. A job well done. He was quite courteous , efficient and professional. I will, of course, call this company if I need servicing in the future.