Plantman,
Let us know what brand of variable speed pump you have. Your five years of no problems is impressive.
I have been thinking of doing so ay my own home, but many friends/clients have had problems with the variable frequency drive (VFD) unit that modulates the speed of the deep well pump. In particular, lightening seems to fry them.
For an open loop system, a VFD well pump seems ideal and I am pleased to see it working for you. I had them put in a few of my installs, but am now unsure.
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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