The NewGenSolar team have just removed our old solar system and replaced it with a Sanden Heat pump unit. NewGen cost only slightly more than the 'supply only' route, which I consider a bargain. There was one minor glitch in the plumbing, which was fixed promptly. The installation is neat and impressive, and the performance of the new system is excellent. This is the best experience I have ever had with an appliance installation. Thanks NewGen.