All the literature I have seen says heating the air is less efficient than heating the water. But I see your point in that if the air is heated the tank will stay close to the air temp. I don't believe I have any vents in that area of the basement but I will look. The closest one may be at least 20 feet away although the furnace (Geothermal) is on the other side of the petitioned wall.
BTW I slowly added NaCl to the system until I got it up to 0.2 percent aka 2 ppt or 2000 ppm. I've had really good luck using salt when I haul fish and have seen a lot of literature that shows it's beneficial.
Last edited by Cecil Baird1; 01/28/10 06:37 PM.
