[Bill]

I have a sunflower field near my home and would like to convert the natural gas heater for my swimming pool to run on biofuel. I need to know how to construct a biofuel production system to convert the sunflowers into fuel and then some sort of heating system to use that fuel to heat the pool water. Thanks.

First build you a good ole fashioned shine still.
harvest sunflower seeds.
brew sunflower seeds.
next purchase a waste oil hot water furnace.
install said furnace.
buy this time the first batch of sunflower shine should be ready for burning.
you'll run out of sunflower fuel by this time next month.
start changing your own oil and burn a 50/50 waste oil kerosene mix.
with all your equipment you should never run out of fuel.