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[mlappin]

do yourself an experiment...get a blower and rad that you would use in your shop, when the outside temps is 30 or below run your garden hose through the exchanger and measure  how much heat you are taking out of the water. your garden hose is likely 2 or 3 gpm. that should give you an idea of what you could expect?

I think you should have more than 2 or 3 gpm out of a garden hose unless it's all 1/2 hose. Just take a few 5 gallon buckets and time how long it takes to fill both of them then do the math.