An innovation on my original idea that was cool but way too far out there. This is the refined, more reasonable approach to the problem. The benefits of the featured design:
-Less particulate pollution
-More efficient
-Less likelihood for quick fluctuations in water temperature
-Water can still be heated long after the fire goes out
-Self pumping (In theory the laws of convection should force the water to pump but that is yet to be seen)
-Simple Materials
-Could be fired with alternative fuels such as
a) Coal
b) Garbage
c) Small newspaper logs
d) Alcohol
e) Propane

-Very Heavy
-Difficult to dismantle
-Harder to clean out
-No way to quickly stop it