As mentioned, that heat is needed for the gasses to properly vent out of the house. Without the heat, no chimney effect. No chimney effect, no gas flow out of the house. No gas flow out of the house, no wake up after you go to sleep. Get it? While wasteful, its essential to have that heat there.
If you want to save that heat, you can but you have get a power vent. Those are a fan that forces the gas out of the house when the burner runs so the "wasted" heat is not needed. Then, that extra heat can stay in the water heater (or furnace). Power vents also have flappers on them to stop the flow of air after the burner turns off so warm air dont keep going up the stack on its own, even when not needed.
So can you capture and save that heat? Yes. Can you use a fan to do it? Yes but you wont if you are smart and want to continue waking up in the mornings. Is it worth trying to save that heat? Not economically. If you are doing this for economic reasons, there is much lower hanging fruit to get. If you are a Gore-zombie willing to spend more than you will ever save, there in no talking logic or reason to you so I will just say have fun and be safe.
A non-leaking water heater and discarded patio door would make a super cheap batch type water heater and would save more energy that a death trap fan setup ever would. All it takes is a little of your time and some scavenged materials. http://www.builditsolar.com/Projects/WaterHeating/water_heating.htm
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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