I am being given the following information by the installer who put in our GSHP system (5 ton split and 3 ton hi temp W2W). After 3 years it is only in the past 2 months that they have started saying that the loop in the ground cannot support the load. Until today they did not divulge why they were claiming that. Here is the information I got from them (indirectly) today: The homeowner desires to have a 98% coverage geothermal system, this is impossible giving the shallow rock that exists below their home, there just is not enough space within their property to install the number of wells required for 98% coverage. The highest level of coverage possible is the 67.6% estimated coverage that our engineer calculates in his design from 12/9/13. I have to note that their initial proposal stated that 98% of the load would be carried by the geo, I did not pull that number out of thin air. Attached is some detail from the well-driller's report. I'd really appreciate some expert opinions on the installer's reasoning (excuse?), and if someone can direct me to anything published that supports or refutes their claim, I'd be very thankful. As most of you know, this is not my first thread so I'm very aware that 6 bores x 200 feet would typically support 8 tons without a problem. Many, many thanks in advance.