UK-based commissioning tests of our new generation of “Pre-Series 0” uDAHR prototypes have been completed in our test well in Beckley, Oxfordshire. The prototype was operated at a typical full solar-pump load for approximately 2000 hours, representing between 1 and 2 years’ typical operation in the field. Although entirely made from machined parts at significant unit cost, the PS0 is one step removed from low-cost mass production processes such as casting, injection moulding, pressing, stamping and extrusion.