„Twister is, on a foot by foot basis compared to conventional loops, the best high-density polyethylene U-Bend ground heat exchanger that can be installed. It ensures quality grouting, great heat transfer and circulator pump energy savings. This is the premium product for closed loop ground coupling devices. It will prove itself as the monitoring data unfolds. ”

Peter Tavino, PE, Certified Geothermal Designer, IGSHPA Trainer