only problem I see is a point of diminshing returns

as flow increases so does pressure

main problem I can see is heat from a pump that size offsetting what little extra flow you will get.


once you hit 3gal/min your gain in heat transfer at 6gal/min will not be much better and the extra heat generated by the pump will be more than the gain in flow.

I know the RAD should be able to sluff off the heat but you are still adding alot of heat to the overall system with a pump that large.

if you own the pump then use it but Iam going to use a MD-20 rlt myself with my auto Rad setup