Thanks Lnewqban! So the concept of the radiator working in reverse sounds viable? Radiators normally dissipate heat. Will the thermal transfer properties be the same in reverse (meaning if a radiator can cool fluid at a certain rate of air and fluid flow, will the same rates apply to heating...
I am looking for a passive way to convert a supply of hot air into warm pool water. My pool can be in the low 70s without heat. Looking to get a 10 degree lift in pool temp. Pool is in-ground and relatively small at 8,500 gal. Water flow rate through the radiators can be regulated by valves...