Read this and cannot tell what they are saying. Are they talking about the size of the blades themselves or the number of blades or the total width of the blades. Because the 6 blade pump has a little bigger blade on it and measures 4.25" across and the 8 blade pump has slightly smaller blades and measures only 4" across the blades. So back to my original question, which one do I use. Is the 6 blade that has been in there causing the heating problem that I have been having like it states in the ad. Another thing that puzzles me is that the 8 blade is a high volume pump. Does that mean it pumps more and if it does will it have more pressure.I am also putting a high volume thermostat in here.
