What are the benefits of slinkies versus straight pipe for ground arrays?

The invention of the slinky® in 1985 is credited to Oklahoma University in the USA, which could be considered the heart of ground source heat pump technology.

Slinkies® are considered by many ground array design experts to be the best method of “horizontal ground coupling” for heat pumps. They are particularly well suited to the UK, and require less digging per kW of heat delivered than any other method and therefore offer the most economic installation costs.

If installed and sized correctly they offer the same performance as straight pipe and will not overcool the ground any more than straight pipe.

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