As long as the HLT is higher than the mash tun, it can gravity feed.
I guess if I fly sparge it will work fine, I thought to attempt to push back thru the bottom of the mash tun in order to batch sparge might be difficult because of resistance from the grain bed????
Slightly off on a tangent, but is it better to add grain the to the MT first and then underlet the strike water? Mt last(and first) AG brew I added the strike water and then dumped the grain in as I stirred.