Sounds like the Yellow Jacket type are ones to strongly consider. I really like the convenience of the four valve system. Thanks to Jeff for the details and to Memphis as I WAS looking at that cheap eBay unit that Memphis bought (and regrets)
As for your offer, I think I will pass . . . . .
Once again, you guys are the best! Thank you.
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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