95c466b3__And_Cooling___Thermal_Systems__Advantages
[Geothermal Loop Type] Closed-Loop In Parallel [Disadvantages] Header lines must be larger diameter than individual loops and so require more complex pipe joining operations than series installation; special care needed to ensure complete air removal from all flow paths when purging system at start-up. [Advantages] 
Shorter flow paths enable smaller pipe diameter to be used, which lowers unit piping cost and requires less antifreeze; reduced pressure drop along shorter flow paths results in smaller pump power requirements.
Geothermal Home Heating And Cooling - Thermal Systems
Advantages