Thanks for the info. It is a dedicated run just under 60' which is why I was thinking the 40a/8ga setup would be fine, but I wanted to double check here to make sure I wasn't missing something obvious (or maybe not so obvious :-) ).

Also, does anyone see any issues with the 1.5"x2" adapter on the inlet/outlet for the heat pump? The heat pump has a min/max gpm rating of 35/75 and my current pump is rated @ 90 gpm, but that is an unrestricted rating. By the time the water flows through the hoses and the sand filter to the heat pump it is within the 75 gpm rating and I don't believe running it through the 2" piping in the heat pump should cause it to drop enough to take it below the minimum. Any thoughts? Thanks.