I've just upgraded to a 2 pump QT. I've had to top up about a few gallons already since yesterday. I did purge one loop at a time using the QT per instructions. I don't remember having to add so much water the last time. Maybe there's still lots of air. The water level doesn't change when the unit is off.
1. To meet the manufacturer's requirement for 9gpm, was 6 before. I have 2100 ft of pipe total. Too much head loss. 2. I'm building a garage so I'm going to reuse the 1 pump for a 1.5 ton geo I think it's settling now. I think what's happening is once I got the larger pumps, it pushed out more air. All this time it was 3-4 gallons low. Still topping up but not as much.
