3010207c__Apricus_vs_Hills___ClearChain__Difference
[Hills] 64 Welds [Apricus] 6 Welds [Comment] Looking at both systems at a local ‘home expo’ this point is quite clear. Hills weld either side of the heat exchanger, Apricus only weld in a few places. The reason for this is probably due to the manifold setup. In the Apricus system the tube sits between two copper pipes. In the Hills there is weld joints either side of each collector. Personally, I believe less welds are stronger as you’ve not cut the original pipe in the first place! The Apricus header was specifically designed in that way to minimise welds which are potential failure points. The Apricus design is NOT less efficient in terms of heat transfer as we have a large head size which provides plenty of contact surface area. The heat pipe to header connection is not a bottle-neck to the system efficiency. [Difference] 
Heat Exchanger Weld Joints
Solar Hot Water - Evacuated Tubes - Apricus vs Hills - ClearChain
Difference