The Edwards pumped solar hot water system, or Ground Tank Direct (GTD) comprises either a 325 or 430 litre storage cylinder at ground level with only the collectors visible on the roof.
The process of hot water being drawn down from the collectors is done automatically via a controller which is connected to temperature sensors located in the collectors and the storage cylinder. When the controller senses that there is hotter water in the collectors than in the bottom of the tank, it automatically activates a small circulator to draw the hot water into the storage cylinder. Available with gas or electric back-up, with two or three panels, either Australis or Titan.