I have a 100' deep well with a Gould 1.5hp variable speed (constant pressure) pump. Well will produce more than 25 GPM (according to the well driller that installed the new pump). The well has been in use for 60 years, pump is a year old. Water quality is very good with the exception of iron: 4ppm iron, 6.6 pH, nominal hardness, no other minerals present in meaningful quantities.

In the driest portion of the year the water level is 30' below the surface. For the last two weeks water has been pouring out of the top of the well. The water pressure popped the well seal.  March is usually when the highest water table is observed in this region. My neighbor tells me that the well has done this every year (sometimes for months at a time) for the last 50years.

Given the high water levels in this well will the pumping penalty usually associated with pump and dump be reduced enough to be economical?

On an unrelated note. I know this depends on local rules. Are pump and dump systems regulated to the same extent that vertical or horizontal loops are in your area?

Open loop geo is the oldest form and works well. Maintenance may be higher. As you solicit bids make sure to double check water quality against manufacturers' specs.
Joe

If the well is artesian once a year it certainly doesn't hurt.  The pumping costs of a pump and dump are often disputed to the minutia. IMHO the benifit of geo far and away out weigh any pumping costs over what would have been spent for conventional heating and cooling.

In cases of water being available at very shallow depths, there is no pumping penalty for open loop. The efficiency of any particular pumps used is a separate matter.