Gary in Pennsylvania wrote:So....I've never heard of anyone trying it, but what about a used hand fired stove modified with water coils working on convection? You would sure as hell pay less for the coal needed than the propane (my assumption). And a fire-safe cubby would need to be built to protect the stove from the elements.
It's not that I'm going to try this....I am not mechanically inclined nor do I have excess disposable income.....but I wonder how warm a "medium burning" coal fire can heat a pool (I'm 15' x 30' x about 4.5' ). I wonder how possible this is?
What are your thoughts???? Am I nuts???
It is possible but not realistic without a heat exchanger and pumps on both the primary and secondary circuit.
A heat exchanger is necessary because pool water contains oxygen and, in most instances, chlorine. These will very quickly destroy anything but high grade stainless or titanium. That is where the heat exchanger comes in. The pool water gains heat from the heat exchanger which is fed with the boiler output. Stainless steel or titanium plates separate the fluids from each other.