capturing exhaust heat from a pellet stove

Would it be posable to capture the heat loss from the flue pipe on a pellet stove? I was thinking about wrapping my flue pipe with like 1/2 copper tubing and then wrap it with insulation. circulate water through the tubing and into an old water heater or some kind of holding tank to use in some in floor heating?

Hi Scott,
Your pellet stove is already optimized for efficiency and durability. If you lower the flue temps, the water vapor in the flue gas will condense and make rain. Not good!